1
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Mi J, Chen Y, Atterberry BA, Nordstrom FL, Hirsh DA, Rossini AJ. Probing the Molecular and Macroscopic Structure of Solid Solutions by Dynamic Nuclear Polarization (DNP) Enhanced 13C and 15N Solid-State NMR Spectroscopy. Mol Pharm 2024. [PMID: 38685852 DOI: 10.1021/acs.molpharmaceut.4c00083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Crystallization is a widely used purification technique in the manufacture of active pharmaceutical ingredients (APIs) and precursor molecules. However, when impurities and desired compounds have similar molecular structures, separation by crystallization may become challenging. In such cases, some impurities may form crystalline solid solutions with the desired product during recrystallization. Understanding the molecular structure of these recrystallized solid solutions is crucial to devise methods for effective purification. Unfortunately, there are limited analytical techniques that provide insights into the molecular structure or spatial distribution of impurities that are incorporated within recrystallized products. In this study, we investigated model solid solutions formed by recrystallizing salicylic acid (SA) in the presence of anthranilic acid (AA). These two molecules are known to form crystalline solid solutions due to their similar molecular structures. To overcome challenges associated with the long 1H longitudinal relaxation times (T1(1H)) of SA and AA, we employed dynamic nuclear polarization (DNP) and 15N isotope enrichment to enable solid-state NMR experiments. Results of solid-state NMR experiments and DFT calculations revealed that SA and AA are homogeneously alloyed as a solid solution. Heteronuclear correlation (HETCOR) experiments and plane-wave DFT structural models provide further evidence of the molecular-level interactions between SA and AA. This research provides valuable insights into the molecular structure of recrystallized solid solutions, contributing to the development of effective purification strategies and an understanding of the physicochemical properties of solid solutions.
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Affiliation(s)
- Jiashan Mi
- Department of Chemistry, Iowa State University, Ames, Iowa 50010, United States
| | - Yunhua Chen
- Department of Chemistry, Iowa State University, Ames, Iowa 50010, United States
| | | | - Fredrik L Nordstrom
- Material & Analytical Sciences, Boehringer-Ingelheim, Ridgefield, Connecticut 06877, United States
| | - David A Hirsh
- Material & Analytical Sciences, Boehringer-Ingelheim, Ridgefield, Connecticut 06877, United States
| | - Aaron J Rossini
- Department of Chemistry, Iowa State University, Ames, Iowa 50010, United States
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2
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Lamahewage SNS, Atterberry BA, Dorn RW, Gi E, Kimball MR, Blümel J, Vela J, Rossini AJ. Accelerated acquisition of wideline solid-state NMR spectra of spin 3/2 nuclei by frequency-stepped indirect detection experiments. Phys Chem Chem Phys 2024; 26:5081-5096. [PMID: 38259035 DOI: 10.1039/d3cp05055f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
73% of all NMR-active nuclei are quadrupolar nuclei with a nuclear spin I > 1/2. The broadening of the solid-state NMR signals by the quadrupolar interaction often leads to poor sensitivity and low resolution. In this work we present experimental and theoretical investigations of magic angle spinning (MAS) 1H{X} double-echo resonance-echo saturation-pulse double-resonance (DE-RESPDOR) and Y{X} J-resolved solid-state NMR experiments for the indirect detection of spin 3/2 quadrupolar nuclei (X = spin 3/2 nuclei, Y = spin 1/2 nuclei). In these experiments, the spectrum of the quadrupolar nucleus is reconstructed by plotting the observed dephasing of the detected spin as a function of the transmitter offset of the indirectly detected spin. Numerical simulations were used to investigate the achievable levels of dephasing and to predict the lineshapes of indirectly detected NMR spectra of the quadrupolar nucleus. We demonstrate 1H, 31P and 207Pb detection of 35Cl, 81Br, and 63Cu (I = 3/2) nuclei in trans-Cl2Pt(NH3)2 (transplatin), (CH3NH3)PbCl3 (methylammonium lead chloride, MAPbCl3), (CH3NH3)PbBr3 (methylammonium lead bromide, MAPbBr3) and CH3C(CH2PPh2)3CuI (1,1,1-tris(diphenylphosphinomethyl)ethane copper(I) iodide, triphosCuI), respectively. In all of these experiments, we were able to detect megahertz wide central transition or satellite transition powder patterns. Significant time savings and gains in sensitivity were attained in several test cases. Additionally, the indirect detection experiments provide valuable structural information because they confirm the presence of dipolar or scalar couplings between the detected nucleus and the quadrupolar nucleus of interest. Finally, numerical simulations suggest these methods are also potentially applicable to abundant spin 5/2 and spin 7/2 quadrupolar nuclei.
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Affiliation(s)
- Sujeewa N S Lamahewage
- US Department of Energy, Ames National Laboratory, Ames, Iowa, 50011, USA.
- Iowa State University, Department of Chemistry, Ames, IA, 50011, USA
| | - Benjamin A Atterberry
- US Department of Energy, Ames National Laboratory, Ames, Iowa, 50011, USA.
- Iowa State University, Department of Chemistry, Ames, IA, 50011, USA
| | - Rick W Dorn
- US Department of Energy, Ames National Laboratory, Ames, Iowa, 50011, USA.
- Iowa State University, Department of Chemistry, Ames, IA, 50011, USA
| | - Eunbyeol Gi
- US Department of Energy, Ames National Laboratory, Ames, Iowa, 50011, USA.
- Iowa State University, Department of Chemistry, Ames, IA, 50011, USA
| | - Maxwell R Kimball
- Texas A&M University, Department of Chemistry, College Station, Texas, 77842, USA.
| | - Janet Blümel
- Texas A&M University, Department of Chemistry, College Station, Texas, 77842, USA.
| | - Javier Vela
- US Department of Energy, Ames National Laboratory, Ames, Iowa, 50011, USA.
- Iowa State University, Department of Chemistry, Ames, IA, 50011, USA
| | - Aaron J Rossini
- US Department of Energy, Ames National Laboratory, Ames, Iowa, 50011, USA.
- Iowa State University, Department of Chemistry, Ames, IA, 50011, USA
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3
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Bhaskar G, Behera RK, Gvozdetskyi V, Carnahan SL, Ribeiro RA, Oftedahl P, Ward C, Canfield PC, Rossini AJ, Huang W, Zaikina JV. Breaking New Ground: MBene Route toward Selective Vinyl Double Bond Hydrogenation in Nitroarenes. J Am Chem Soc 2023; 145:27459-27470. [PMID: 38059480 DOI: 10.1021/jacs.3c08642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
Doping, or incremental substitution of one element for another, is an effective way to tailor a compound's structure as well as its physical and chemical properties. Herein, we replaced up to 30% of Ni with Co in members of the family of layered LiNiB compounds, stabilizing the high-temperature polymorph of LiNiB while the room-temperature polymorph does not form. By studying this layered boride with in situ high-temperature powder diffraction, we obtained a distorted variant of LiNi0.7Co0.3B featuring a perfect interlayer placement of [Ni0.7Co0.3B] layers on top of each other─a structural motif not seen before in other borides. Because of the Co doping, LiNi0.7Co0.3B can undergo a nearly complete topochemical Li deintercalation under ambient conditions, resulting in a metastable boride with the formula Li0.04Ni0.7Co0.3B. Heating of Li0.04Ni0.7Co0.3B in anaerobic conditions led to yet another metastable boride, Li0.01Ni0.7Co0.3B, with a CoB-type crystal structure that cannot be obtained by simple annealing of Ni, Co, and B. No significant alterations of magnetic properties were detected upon Co-doping in the temperature-independent paramagnet LiNi0.7Co0.3B or its Li-deintercalated counterparts. Finally, Li0.01Ni0.7Co0.3B stands out as an exceptional catalyst for the selective hydrogenation of the vinyl C═C bond in 3-nitrostyrene, even in the presence of other competing functional groups. This research showcases an innovative approach to heterogeneous catalyst design by meticulously synthesizing metastable compounds.
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Affiliation(s)
- Gourab Bhaskar
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Ranjan K Behera
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | | | - Scott L Carnahan
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States
- Department of Chemistry, Saint Mary's University of Minnesota, Winona, Minnesota 55987, United States
| | - Raquel A Ribeiro
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States
| | - Paul Oftedahl
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Charles Ward
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Paul C Canfield
- Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States
| | - Aaron J Rossini
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States
| | - Wenyu Huang
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States
| | - Julia V Zaikina
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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4
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Zhou C, Wang D, Lagunas F, Atterberry B, Lei M, Hu H, Zhou Z, Filatov AS, Jiang DE, Rossini AJ, Klie RF, Talapin DV. Hybrid organic-inorganic two-dimensional metal carbide MXenes with amido- and imido-terminated surfaces. Nat Chem 2023; 15:1722-1729. [PMID: 37537297 DOI: 10.1038/s41557-023-01288-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 06/29/2023] [Indexed: 08/05/2023]
Abstract
Two-dimensional (2D) transition-metal carbides and nitrides (MXenes) combine the electronic and mechanical properties of 2D inorganic crystals with chemically modifiable surfaces, which provides an ideal platform for both fundamental and applied studies of interfaces. Good progress has been achieved in the functionalization of MXenes with small inorganic ligands, but relatively little work has been reported on the covalent bonding of various organic groups to MXene surfaces. Here we synthesize a family of hybrid MXenes (h-MXenes) that incorporate amido- and imido-bonding between organic and inorganic parts by reacting halogen-terminated MXenes with deprotonated organic amines. The resulting hybrid structures unite tailorability of organic molecules with electronic connectivity and other properties of inorganic 2D materials. Describing the structure of h-MXene necessitates the integration of concepts from coordination chemistry, self-assembled monolayers and surface science. The optical properties of h-MXenes reveal coherent coupling between the organic and inorganic constituents. h-MXenes also exhibit superior stability against hydrolysis.
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Affiliation(s)
- Chenkun Zhou
- Department of Chemistry, University of Chicago, Chicago, IL, USA
- James Franck Institute, University of Chicago, Chicago, IL, USA
| | - Di Wang
- Department of Chemistry, University of Chicago, Chicago, IL, USA
| | - Francisco Lagunas
- Department of Physics, University of Illinois Chicago, Chicago, IL, USA
| | - Benjamin Atterberry
- US Department of Energy, Ames National Laboratory, Ames, IA, USA
- Department of Chemistry, Iowa State University, Ames, IA, USA
| | - Ming Lei
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA
| | - Huicheng Hu
- Department of Chemistry, University of Chicago, Chicago, IL, USA
| | - Zirui Zhou
- Department of Chemistry, University of Chicago, Chicago, IL, USA
| | | | - De-En Jiang
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA
| | - Aaron J Rossini
- US Department of Energy, Ames National Laboratory, Ames, IA, USA
- Department of Chemistry, Iowa State University, Ames, IA, USA
| | - Robert F Klie
- Department of Physics, University of Illinois Chicago, Chicago, IL, USA
| | - Dmitri V Talapin
- Department of Chemistry, University of Chicago, Chicago, IL, USA.
- James Franck Institute, University of Chicago, Chicago, IL, USA.
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL, USA.
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL, USA.
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5
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Giraudeau P, Rossini AJ. Editorial for JMR special virtual issue NMR methods for pharmaceuticals and metabolomics. J Magn Reson 2023; 357:107581. [PMID: 37950960 DOI: 10.1016/j.jmr.2023.107581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2023]
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6
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Biswas R, Chen Y, Vela J, Rossini AJ. Relativistic DFT Calculations of Cadmium and Selenium Solid-State NMR Spectra of CdSe Nanocrystal Surfaces. ACS Omega 2023; 8:44362-44371. [PMID: 38027327 PMCID: PMC10666156 DOI: 10.1021/acsomega.3c07680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 10/11/2023] [Accepted: 10/16/2023] [Indexed: 12/01/2023]
Abstract
Solid-state NMR spectra have been used to probe the structure of CdSe nanocrystals and propose detailed models of their surface structures. Density functional theory (DFT)-optimized cluster models that represent probable molecular structures of carboxylate-coordinated surface sites have been proposed. However, to the best of our knowledge, 113Cd and 77Se chemical shifts have not been calculated for these surface models. We performed relativistic DFT calculations of cadmium and selenium magnetic shielding tensors on model compounds with previously measured solid-state NMR spectra with (i) the four-component Dirac-Kohn-Sham (DKS) Hamiltonian and (ii) the scalar and (iii) spin-orbit levels within the ZORA Hamiltonian. Molecular clusters with Cd and Se sites in varying bonding environments were used to model CdSe (100) and CdSe(111) surfaces capped with carboxylic acid ligands. Our calculations identify the observed 113Cd isotropic chemical shifts δ(iso) of -465, -318, and -146 ppm arising from CdSeO3, CdSe2O2, and CdSe3O surface groups, respectively, with very good agreement with experimental measurements. The 113Cd chemical shifts linearly decrease with the number of O-neighbors. The calculated spans (δ11 - δ33) encompass the experimental values for CdSe3O and CdSe2O2 clusters but are slightly larger than the measured value for CdSeO3 clusters. Relativistic DFT calculations predicted a one-bond 113Cd-77Se scalar coupling of 258 Hz, which is in good agreement with the experimental values of 250 Hz. With a dense coverage of carboxylic acid ligands, the CdSe (100) surface shows a distribution of Cd-Se bond lengths and J-couplings. Relativistic DFT simulations thus aid in interpretation of NMR spectra of CdSe nanocrystals and related nanomaterials.
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Affiliation(s)
- Rana Biswas
- U.S.
Department of Energy Ames National Laboratory, Ames, Iowa 50011. United States
- Department
of Physics and Astronomy; Electrical & Computer Engineering; Microelectronics
Research Center, Iowa State University, Ames, Iowa 50011. United States
| | - Yunhua Chen
- U.S.
Department of Energy Ames National Laboratory, Ames, Iowa 50011. United States
- Department
of Chemistry, Iowa State University, Ames, Iowa 50011. United States
| | - Javier Vela
- U.S.
Department of Energy Ames National Laboratory, Ames, Iowa 50011. United States
- Department
of Chemistry, Iowa State University, Ames, Iowa 50011. United States
| | - Aaron J. Rossini
- U.S.
Department of Energy Ames National Laboratory, Ames, Iowa 50011. United States
- Department
of Chemistry, Iowa State University, Ames, Iowa 50011. United States
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7
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Dorn RW, Carnahan SL, Cheng CY, Pan L, Hao Z, Rossini AJ. Structural characterization of tin in toothpaste by dynamic nuclear polarization enhanced 119Sn solid-state NMR spectroscopy. Nat Commun 2023; 14:7423. [PMID: 37973961 PMCID: PMC10654397 DOI: 10.1038/s41467-023-42816-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 10/20/2023] [Indexed: 11/19/2023] Open
Abstract
Stannous fluoride (SnF2) is an effective fluoride source and antimicrobial agent that is widely used in commercial toothpaste formulations. The antimicrobial activity of SnF2 is partly attributed to the presence of Sn(II) ions. However, it is challenging to directly determine the Sn speciation and oxidation state within commercially available toothpaste products due to the low weight loading of SnF2 (0.454 wt% SnF2, 0.34 wt% Sn) and the amorphous, semi-solid nature of the toothpaste. Here, we show that dynamic nuclear polarization (DNP) enables 119Sn solid-state NMR experiments that can probe the Sn speciation within commercially available toothpaste. Solid-state NMR experiments on SnF2 and SnF4 show that 19F isotropic chemical shift and 119Sn chemical shift anisotropy (CSA) are highly sensitive to the Sn oxidation state. DNP-enhanced 119Sn magic-angle turning (MAT) 2D NMR spectra of toothpastes resolve Sn(II) and Sn(IV) by their 119Sn chemical shift tensor parameters. Fits of DNP-enhanced 1D 1H → 119Sn solid-state NMR spectra allow the populations of Sn(II) and Sn(IV) within the toothpastes to be estimated. This analysis reveals that three of the four commercially available toothpastes contained at least 80% Sn(II), whereas one of the toothpaste contained a significantly higher amount of Sn(IV).
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Affiliation(s)
- Rick W Dorn
- US Department of Energy Ames National Laboratory, Ames, IA, 50011, USA
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA
| | - Scott L Carnahan
- US Department of Energy Ames National Laboratory, Ames, IA, 50011, USA
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA
| | | | - Long Pan
- Colgate-Palmolive Company, Piscataway, NJ, 08855, USA
| | - Zhigang Hao
- Colgate-Palmolive Company, Piscataway, NJ, 08855, USA.
| | - Aaron J Rossini
- US Department of Energy Ames National Laboratory, Ames, IA, 50011, USA.
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA.
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8
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Roth AN, Chen Y, Santhiran A, Opare-Addo J, Gi E, Smith EA, Rossini AJ, Vela J. Designing complex Pb 3SBr xI 4-x chalcohalides: tunable emission semiconductors through halide-mixing. Chem Sci 2023; 14:12331-12338. [PMID: 37969605 PMCID: PMC10631247 DOI: 10.1039/d3sc02733c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Accepted: 10/12/2023] [Indexed: 11/17/2023] Open
Abstract
Chalcohalides are desirable semiconducting materials due to their enhanced light-absorbing efficiency and stability compared to lead halide perovskites. However, unlike perovskites, tuning the optical properties of chalcohalides by mixing different halide ions into their structure remains to be explored. Here, we present an effective strategy for halide-alloying Pb3SBrxI4-x (1 ≤ x ≤ 3) using a solution-phase approach and study the effect of halide-mixing on structural and optical properties. We employ a combination of X-ray diffraction, electron microscopy, and solid-state NMR spectroscopy to probe the chemical structure of the chalcohalides and determine mixed-halide incorporation. The absorption onsets of the chalcohalides blue-shift to higher energies as bromide replaces iodide within the structure. The photoluminescence maxima of these materials mimics this trend at both the ensemble and single particle fluorescence levels, as observed by solution-phase and single particle fluorescence microscopy, respectively. These materials exhibit superior stability against moisture compared to traditional lead halide perovskites, and IR spectroscopy reveals that the chalcohalide surfaces are terminated by both amine and carboxylate ligands. Electronic structure calculations support the experimental band gap widening and volume reduction with increased bromide incorporation, and provide useful insight into the likely atomic coloring patterns of the different mixed-halide compositions. Ultimately, this study expands the range of tunability that is achievable with chalcohalides, which we anticipate will improve the suitability of these semiconducting materials for light absorbing and emission applications.
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Affiliation(s)
- Alison N Roth
- US DOE Ames National Laboratory Ames Iowa 50010 USA
- Department of Chemistry, Iowa State University Ames Iowa 50011 USA
| | - Yunhua Chen
- US DOE Ames National Laboratory Ames Iowa 50010 USA
- Department of Chemistry, Iowa State University Ames Iowa 50011 USA
| | - Anuluxan Santhiran
- US DOE Ames National Laboratory Ames Iowa 50010 USA
- Department of Chemistry, Iowa State University Ames Iowa 50011 USA
| | - Jemima Opare-Addo
- US DOE Ames National Laboratory Ames Iowa 50010 USA
- Department of Chemistry, Iowa State University Ames Iowa 50011 USA
| | - Eunbyeol Gi
- US DOE Ames National Laboratory Ames Iowa 50010 USA
- Department of Chemistry, Iowa State University Ames Iowa 50011 USA
| | - Emily A Smith
- US DOE Ames National Laboratory Ames Iowa 50010 USA
- Department of Chemistry, Iowa State University Ames Iowa 50011 USA
| | - Aaron J Rossini
- US DOE Ames National Laboratory Ames Iowa 50010 USA
- Department of Chemistry, Iowa State University Ames Iowa 50011 USA
| | - Javier Vela
- US DOE Ames National Laboratory Ames Iowa 50010 USA
- Department of Chemistry, Iowa State University Ames Iowa 50011 USA
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9
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Du C, Gregory P, Jamadgni DU, Pauls AM, Chang JJ, Dorn RW, Martin A, Foster EJ, Rossini AJ, Thuo M. Spatially Directed Pyrolysis via Thermally Morphing Surface Adducts. Angew Chem Int Ed Engl 2023; 62:e202308822. [PMID: 37466460 DOI: 10.1002/anie.202308822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 07/19/2023] [Accepted: 07/19/2023] [Indexed: 07/20/2023]
Abstract
Combustion is often difficult to spatially direct or tune associated kinetics-hence a run-away reaction. Coupling pyrolytic chemical transformation to mass transport and reaction rates (Damköhler number), however, we spatially directed ignition with concomitant switch from combustion to pyrolysis (low oxidant). A 'surface-then-core' order in ignition, with concomitant change in burning rate,is therefore established. Herein, alkysilanes grafted onto cellulose fibers are pyrolyzed into non-flammable SiO2 terminating surface ignition propagation, hence stalling flame propagating. Sustaining high temperatures, however, triggers ignition in the bulk of the fibers but under restricted gas flow (oxidant and/or waste) hence significantly low rate of ignition propagation and pyrolysis compared to open flame (Liñán's equation). This leads to inside-out thermal degradation and, with felicitous choice of conditions, formation of graphitic tubes. Given the temperature dependence, imbibing fibers with an exothermically oxidizing synthon (MnCl2 ) or a heat sink (KCl) abets or inhibits pyrolysis leading to tuneable wall thickness. We apply this approach to create magnetic, paramagnetic, or oxide containing carbon fibers. Given the surface sensitivity, we illustrate fabrication of nm- and μm-diameter tubes from appropriately sized fibers.
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Affiliation(s)
- Chuanshen Du
- Materials Science and Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Paul Gregory
- Materials Science and Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Dhanush U Jamadgni
- Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA
- Materials Science and Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Alana M Pauls
- Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA
- Materials Science and Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Julia J Chang
- Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA
- Materials Science and Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Rick W Dorn
- US Department of Energy, Ames National Laboratory, Ames, IA, 50011, USA
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA
| | - Andrew Martin
- Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA
- Materials Science and Engineering, Iowa State University, Ames, IA, 50011, USA
| | - E Johan Foster
- Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, V6T 1Z3, BC, Canada
| | - Aaron J Rossini
- US Department of Energy, Ames National Laboratory, Ames, IA, 50011, USA
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA
| | - Martin Thuo
- Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA
- Materials Science and Engineering, Iowa State University, Ames, IA, 50011, USA
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10
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Chen Y, Mi J, Rossini AJ. A focus on detection of polymorphs by dynamic nuclear polarization solid-state nuclear magnetic resonance spectroscopy. Chem Sci 2023; 14:11296-11299. [PMID: 37886103 PMCID: PMC10599483 DOI: 10.1039/d3sc90177g] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2023] Open
Abstract
Solid-state nuclear magnetic resonance (ssNMR) spectroscopy has found increasing application as a method for quantification and structure determination of solid forms (polymorphs) of organic solids and active pharmaceutical ingredients (APIs). However, ssNMR spectroscopy suffers from low sensitivity and resolution, making it challenging to detect dilute solid forms that may be present after recrystallization or reaction with co-formers. Cousin et al. (S. F. Cousin et al., Chem. Sci., 2023, https://doi.org/10.1039/D3SC02063K) have demonstrated that dynamic nuclear polarization (DNP) enhanced 13C cross-polarization (CP) saturation recovery experiments can be used to detect dilute polymorphic forms that are present within a mixture of solid forms. Enhancement of the NMR signal by DNP and differences in signal build-up rates for different polymorphs provide the sensitivity and contrast needed to resolve NMR signals from minor polymorphic forms. This method demonstrated by Cousin et al. should aid the discovery of solid drug forms.
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Affiliation(s)
- Yunhua Chen
- Analytical Research & Development, AbbVie, Inc. North Chicago Illinois 60064 USA
| | - Jiashan Mi
- Department of Chemistry, Iowa State University Ames IA 50011 USA
| | - Aaron J Rossini
- Department of Chemistry, Iowa State University Ames IA 50011 USA
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11
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Gupta A, Ondry JC, Lin K, Chen Y, Hudson MH, Chen M, Schaller RD, Rossini AJ, Rabani E, Talapin DV. Composition-Defined Optical Properties and the Direct-to-Indirect Transition in Core-Shell In 1-xGa xP/ZnS Colloidal Quantum Dots. J Am Chem Soc 2023. [PMID: 37466972 PMCID: PMC10401719 DOI: 10.1021/jacs.3c02709] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2023]
Abstract
Semiconductors are commonly divided into materials with direct or indirect band gaps based on the relative positions of the top of the valence band and the bottom of the conduction band in crystal momentum (k) space. It has, however, been debated if k is a useful quantum number to describe the band structure in quantum-confined nanocrystalline systems, which blur the distinction between direct and indirect gap semiconductors. In bulk III-V semiconductor alloys like In1-xGaxP, the band structure can be tuned continuously from the direct- to indirect-gap by changing the value of x. The effect of strong quantum confinement on the direct-to-indirect transition in this system has yet to be established because high-quality colloidal nanocrystal samples have remained inaccessible. Herein, we report one of the first systematic studies of ternary III-V nanocrystals by utilizing an optimized molten-salt In-to-Ga cation exchange protocol to yield bright In1-xGaxP/ZnS core-shell particles with photoluminescence quantum yields exceeding 80%. We performed two-dimensional solid-state NMR studies to assess the alloy homogeneity and the extent of surface oxidation in In1-xGaxP cores. The radiative decay lifetime for In1-xGaxP/ZnS monotonically increases with higher gallium content. Transient absorption studies on In1-xGaxP/ZnS nanocrystals demonstrate signatures of direct- and indirect-like behavior based on the presence or absence, respectively, of excitonic bleach features. Atomistic electronic structure calculations based on the semi-empirical pseudopotential model are used to calculate absorption spectra and radiative lifetimes and evaluate band-edge degeneracy; the resulting calculated electronic properties are consistent with experimental observations. By studying photoluminescence characteristics at elevated temperatures, we demonstrate that a reduced lattice mismatch at the III-V/II-VI core-shell interface can enhance the thermal stability of emission. These insights establish cation exchange in molten inorganic salts as a viable synthetic route to nontoxic, high-quality In1-xGaxP/ZnS QD emitters with desirable optoelectronic properties.
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Affiliation(s)
- Aritrajit Gupta
- Department of Chemistry, James Franck Institute, and Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
| | - Justin C Ondry
- Department of Chemistry, James Franck Institute, and Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
| | - Kailai Lin
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Yunhua Chen
- US DOE Ames Laboratory, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Margaret H Hudson
- Department of Chemistry, James Franck Institute, and Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
| | - Min Chen
- Department of Chemistry, James Franck Institute, and Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
| | - Richard D Schaller
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Aaron J Rossini
- US DOE Ames Laboratory, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Eran Rabani
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- The Raymond and Beverly Sackler Center of Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv 69978, Israel
| | - Dmitri V Talapin
- Department of Chemistry, James Franck Institute, and Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States
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12
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De Biasi F, Hope MA, Avalos CE, Karthikeyan G, Casano G, Mishra A, Badoni S, Stevanato G, Kubicki DJ, Milani J, Ansermet JP, Rossini AJ, Lelli M, Ouari O, Emsley L. Optically Enhanced Solid-State 1H NMR Spectroscopy. J Am Chem Soc 2023. [PMID: 37366803 DOI: 10.1021/jacs.3c03937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
Low sensitivity is the primary limitation to extending nuclear magnetic resonance (NMR) techniques to more advanced chemical and structural studies. Photochemically induced dynamic nuclear polarization (photo-CIDNP) is an NMR hyperpolarization technique where light is used to excite a suitable donor-acceptor system, creating a spin-correlated radical pair whose evolution drives nuclear hyperpolarization. Systems that exhibit photo-CIDNP in solids are not common, and this effect has, up to now, only been observed for 13C and 15N nuclei. However, the low gyromagnetic ratio and natural abundance of these nuclei trap the local hyperpolarization in the vicinity of the chromophore and limit the utility for bulk hyperpolarization. Here, we report the first example of optically enhanced solid-state 1H NMR spectroscopy in the high-field regime. This is achieved via photo-CIDNP of a donor-chromophore-acceptor molecule in a frozen solution at 0.3 T and 85 K, where spontaneous spin diffusion among the abundant strongly coupled 1H nuclei relays polarization through the whole sample, yielding a 16-fold bulk 1H signal enhancement under continuous laser irradiation at 450 nm. These findings enable a new strategy for hyperpolarized NMR beyond the current limits of conventional microwave-driven DNP.
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Affiliation(s)
- Federico De Biasi
- Institut des Sciences et Ingenierie Chimiques, École Polytechnique Fedérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Michael A Hope
- Institut des Sciences et Ingenierie Chimiques, École Polytechnique Fedérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Claudia E Avalos
- Institut des Sciences et Ingenierie Chimiques, École Polytechnique Fedérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Ganesan Karthikeyan
- Institute of Radical Chemistry, Aix-Marseille University, CNRS, ICR, 13013 Marseille, France
| | - Gilles Casano
- Institute of Radical Chemistry, Aix-Marseille University, CNRS, ICR, 13013 Marseille, France
| | - Aditya Mishra
- Institut des Sciences et Ingenierie Chimiques, École Polytechnique Fedérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Saumya Badoni
- Institut des Sciences et Ingenierie Chimiques, École Polytechnique Fedérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Gabriele Stevanato
- Institut des Sciences et Ingenierie Chimiques, École Polytechnique Fedérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Dominik J Kubicki
- Institut des Sciences et Ingenierie Chimiques, École Polytechnique Fedérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Jonas Milani
- Institut de Physique, École Polytechnique Fedérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Jean-Philippe Ansermet
- Institut de Physique, École Polytechnique Fedérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Aaron J Rossini
- U.S. Department of Energy, Ames Laboratory, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Moreno Lelli
- Magnetic Resonance Center (CERM) and Department of Chemistry "Ugo Schiff", University of Florence, 50019 Sesto Fiorentino, Italy
- Consorzio Interuniversitario Risonanze Magnetiche delle Metalloproteine Paramagnetiche (CIRMMP), 50019 Sesto Fiorentino, Italy
| | - Olivier Ouari
- Institute of Radical Chemistry, Aix-Marseille University, CNRS, ICR, 13013 Marseille, France
| | - Lyndon Emsley
- Institut des Sciences et Ingenierie Chimiques, École Polytechnique Fedérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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13
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Atterberry BA, Wimmer E, Estes DP, Rossini AJ. Acceleration of indirect detection 195Pt solid-state NMR experiments by sideband selective excitation or alternative indirect sampling schemes. J Magn Reson 2023; 352:107457. [PMID: 37163927 DOI: 10.1016/j.jmr.2023.107457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 03/27/2023] [Accepted: 04/12/2023] [Indexed: 05/12/2023]
Abstract
The measurement of the of chemical shift (CS) tensors via solid-state NMR (ssNMR) spectroscopy has proven to be a powerful probe of structure for organic molecules, biomolecules, and inorganic materials. However, when measuring the NMR spectra of heavy spin-1/2 isotopes the chemical shift anisotropy (CSA) is commonly on the order of thousands of parts per million, which makes acquisition of NMR spectra difficult due to the low NMR sensitivity imposed by the breadth of the signals and challenges in uniformly exciting the NMR spectrum. We have recently shown that complete 195Pt NMR spectra could be rapidly measured by using 195Pt saturation or excitation selective long pulses (SLP) with multiple rotor-cycle durations and RF fields less than 50 kHz into 1H{195Pt} or 1H-31P{195Pt} PE S-RESPDOR, TONE D-HMQC-4, J-resolved, and J-HMQC pulse sequences. The SLP only provide signal or dephasing when they are applied on resonance with a spinning sideband. The magic angle spinning 195Pt NMR spectrum is reconstructed in the sideband selective NMR experiments by acquiring 1D NMR spectra at variable 195Pt pulse offsets. In this work, we present a detailed investigation of the specific pulse conditions required for the ideal performance of sideband selective experiments. Sideband selective experiments are shown to be able to accurately reproduce MAS NMR spectra with minimal distortions of relative sideband intensities. It is also demonstrated that a 195Pt NMR spectrum indirectly detected with HMQC can be rapidly obtained by acquiring a single rotor cycle of indirect dimension evolution points. We dub this method One Rotor Cycle of Acquisition (ORCA) HMQC. Sideband selective experiments and ORCA HMQC experiments are shown to provide a one order of magnitude improvement in experiment times as compared to conventional wideline HMQC experiments.
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Affiliation(s)
- Benjamin A Atterberry
- US DOE Ames National Laboratory, Ames, IA 50011, USA; Iowa State University, Department of Chemistry, Ames, IA 50011, USA
| | - Erik Wimmer
- University of Stuttgart, Department of Chemistry, Stuttgart, Baden-Württemberg, 70569, Germany
| | - Deven P Estes
- University of Stuttgart, Department of Chemistry, Stuttgart, Baden-Württemberg, 70569, Germany
| | - Aaron J Rossini
- US DOE Ames National Laboratory, Ames, IA 50011, USA; Iowa State University, Department of Chemistry, Ames, IA 50011, USA.
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14
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Volkov A, Mi J, Lalit K, Chatterjee P, Jing D, Carnahan SL, Chen Y, Sun S, Rossini AJ, Huang W, Stanley LM. General Strategy for Incorporation of Functional Group Handles into Covalent Organic Frameworks via the Ugi Reaction. J Am Chem Soc 2023; 145:6230-6239. [PMID: 36892967 DOI: 10.1021/jacs.2c12440] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2023]
Abstract
The library of imine-linked covalent organic frameworks (COFs) has grown significantly over the last two decades, featuring a variety of morphologies, pore sizes, and applications. An array of synthetic methods has been developed to expand the scope of the COF functionalities; however, most of these methods were designed to introduce functional scaffolds tailored to a specific application. Having a general approach to diversify COFs via late-stage incorporation of functional group handles would greatly facilitate the transformation of these materials into platforms for a variety of useful applications. Herein, we report a general strategy to introduce functional group handles in COFs via the Ugi multicomponent reaction. To demonstrate the versatility of this approach, we have synthesized two COFs with hexagonal and kagome morphologies. We then introduced azide, alkyne, and vinyl functional groups, which could be readily utilized for a variety of post-synthetic modifications. This facile approach enables the functionalization of any COFs containing imine linkages.
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Affiliation(s)
- Alexander Volkov
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
| | - Jiashan Mi
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
| | - Kanika Lalit
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
| | - Puranjan Chatterjee
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
| | - Dapeng Jing
- Materials Analysis and Research Laboratory, Iowa State University, Ames, Iowa 50011, United States
| | - Scott L Carnahan
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
| | - Yunhua Chen
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
| | - Simin Sun
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
| | - Aaron J Rossini
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
| | - Wenyu Huang
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
| | - Levi M Stanley
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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15
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Zhang M, Samanta J, Atterberry BA, Staples R, Rossini AJ, Ke C. A Crosslinked Ionic Organic Framework for Efficient Iodine and Iodide Remediation in Water. Angew Chem Int Ed Engl 2022; 61:e202214189. [PMID: 36331335 DOI: 10.1002/anie.202214189] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Indexed: 11/06/2022]
Abstract
Iodine is widely used as an antimicrobial reagent for water disinfection in the wilderness and outer space, but residual iodine and iodide need to be removed for health reasons. Currently, it is challenging to remove low concentrations of iodine and iodide in water (≈5 ppm). Furthermore, the remediation of iodine and iodide across a broad temperature range (up to 90 °C) has not previously been investigated. In this work, we report a nitrate dimer-directed synthesis of a single-crystalline ionic hydrogen-bonded crosslinked organic framework (HC OF-7). HC OF-7 removes iodine and iodide species in water efficiently through halogen bonding and anion exchange, reducing the total iodine concentration to 0.22 ppm at room temperature. Packed HC OF-7 columns were employed for iodine/iodide breakthrough experiments between 23 and 90 °C, and large breakthrough volumes were recorded (≥18.3 L g-1 ). The high iodine/iodide removal benchmarks recorded under practical conditions make HC OF-7 a promising adsorbent for water treatment.
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Affiliation(s)
- Mingshi Zhang
- Department of Chemistry, Dartmouth College, 41 College Street, Hanover, NH 03755, USA
| | - Jayanta Samanta
- Department of Chemistry, Dartmouth College, 41 College Street, Hanover, NH 03755, USA
| | - Benjamin A Atterberry
- United States Department of Energy, Ames National Laboratory, Ames, IA 50011, USA.,Department of Chemistry, Iowa State University, Ames, IA, 50011, USA
| | - Richard Staples
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, MI 48824, USA
| | - Aaron J Rossini
- United States Department of Energy, Ames National Laboratory, Ames, IA 50011, USA.,Department of Chemistry, Iowa State University, Ames, IA, 50011, USA
| | - Chenfeng Ke
- Department of Chemistry, Dartmouth College, 41 College Street, Hanover, NH 03755, USA
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16
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Gi E, Chen Y, Wang XR, Carnahan SL, Rahman S, Smith EA, Rossini AJ, Vela J. Chemical-Induced Slippage in Bulk WSe 2. J Phys Chem Lett 2022; 13:10924-10928. [PMID: 36395418 DOI: 10.1021/acs.jpclett.2c02963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Layered transition-metal dichalcogenides (TMDs) are the focus of intense research owing to their semiconducting properties and applications in many fields of research. In addition to intercalation and exfoliation, physical strain modulation has been reported as a way to mechanically induce the slippage of layers and influence the properties of TMDs. In this work, we report the chemically induced slippage of layers in bulk tungsten diselenide (WSe2). Powder X-ray diffraction, Raman spectroscopy, electron microscopy, and thermal analysis suggest that slippage is easily achieved by grinding in the presence of common solvents. Chemically induced slippage of TMDs may represent an intermediate step leading to the exfoliation of these materials. We anticipate that chemical slippage will widen the synthetic utility and advance our understanding of the mechanical and optoelectronic properties of layered materials.
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Affiliation(s)
- Eunbyeol Gi
- Ames National Laboratory, United States Department of Energy, Ames, Iowa 50011, United States, and
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Yunhua Chen
- Ames National Laboratory, United States Department of Energy, Ames, Iowa 50011, United States, and
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Xuan Robben Wang
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Scott L Carnahan
- Ames National Laboratory, United States Department of Energy, Ames, Iowa 50011, United States, and
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Sharifur Rahman
- Ames National Laboratory, United States Department of Energy, Ames, Iowa 50011, United States, and
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Emily A Smith
- Ames National Laboratory, United States Department of Energy, Ames, Iowa 50011, United States, and
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Aaron J Rossini
- Ames National Laboratory, United States Department of Energy, Ames, Iowa 50011, United States, and
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Javier Vela
- Ames National Laboratory, United States Department of Energy, Ames, Iowa 50011, United States, and
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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17
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Wang Z, Völker LA, Robinson TC, Kaeffer N, Menzildjian G, Jabbour R, Venkatesh A, Gajan D, Rossini AJ, Copéret C, Lesage A. Speciation and Structures in Pt Surface Sites Stabilized by N-Heterocyclic Carbene Ligands Revealed by Dynamic Nuclear Polarization Enhanced Indirectly Detected 195Pt NMR Spectroscopic Signatures and Fingerprint Analysis. J Am Chem Soc 2022; 144:21530-21543. [DOI: 10.1021/jacs.2c08300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Zhuoran Wang
- Université de Lyon, CNRS, ENS Lyon, Université Lyon 1, Centre de RMN à hauts champs de Lyon, UMR 5082, 5 rue de la Doua, Villeurbanne F-69100, France
| | - Laura A. Völker
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5/10, Zürich CH-8093, Switzerland
| | - Thomas C. Robinson
- Université de Lyon, CNRS, ENS Lyon, Université Lyon 1, Centre de RMN à hauts champs de Lyon, UMR 5082, 5 rue de la Doua, Villeurbanne F-69100, France
| | - Nicolas Kaeffer
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5/10, Zürich CH-8093, Switzerland
| | - Georges Menzildjian
- Université de Lyon, CNRS, ENS Lyon, Université Lyon 1, Centre de RMN à hauts champs de Lyon, UMR 5082, 5 rue de la Doua, Villeurbanne F-69100, France
| | - Ribal Jabbour
- Université de Lyon, CNRS, ENS Lyon, Université Lyon 1, Centre de RMN à hauts champs de Lyon, UMR 5082, 5 rue de la Doua, Villeurbanne F-69100, France
| | - Amrit Venkatesh
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - David Gajan
- Université de Lyon, CNRS, ENS Lyon, Université Lyon 1, Centre de RMN à hauts champs de Lyon, UMR 5082, 5 rue de la Doua, Villeurbanne F-69100, France
| | - Aaron J. Rossini
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - Christophe Copéret
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5/10, Zürich CH-8093, Switzerland
| | - Anne Lesage
- Université de Lyon, CNRS, ENS Lyon, Université Lyon 1, Centre de RMN à hauts champs de Lyon, UMR 5082, 5 rue de la Doua, Villeurbanne F-69100, France
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18
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Zhang M, Samanta J, Atterberry B, Staples R, Rossini AJ, Ke C. A Crosslinked Ionic Organic Framework for Efficient Iodine and Iodide Remediation in Water. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202214189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Mingshi Zhang
- Dartmouth College Department of Chemistry UNITED STATES
| | | | | | - Richard Staples
- Michigan State University Department of Chemistry UNITED STATES
| | | | - Chenfeng Ke
- Dartmouth College Department of Chemistry 41 College Street 03755 Hanover UNITED STATES
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19
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Dorn RW, Mark LO, Hung I, Cendejas MC, Xu Y, Gor'kov PL, Mao W, Ibrahim F, Gan Z, Hermans I, Rossini AJ. An Atomistic Picture of Boron Oxide Catalysts for Oxidative Dehydrogenation Revealed by Ultrahigh Field 11B- 17O Solid-State NMR Spectroscopy. J Am Chem Soc 2022; 144:18766-18771. [PMID: 36214757 DOI: 10.1021/jacs.2c08237] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Boron oxide/hydroxide supported on oxidized activated carbon (B/OAC) was shown to be an inexpensive catalyst for the oxidative dehydrogenation (ODH) of propane that offers activity and selectivity comparable to boron nitride. Here, we obtain an atomistic picture of the boron oxide/hydroxide layer in B/OAC by using 35.2 T 11B and 17O solid-state NMR experiments. NMR spectra measured at 35.2 T resolve the boron and oxygen sites due to narrowing of the central-transition powder patterns. A 35.2 T 2D 11B{17O} dipolar heteronuclear correlation NMR spectrum revealed the structural connectivity between boron and oxygen atoms. The approach outlined here should be generally applicable to determine atomistic structures of heterogeneous catalysts containing quadrupolar nuclei.
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Affiliation(s)
- Rick W Dorn
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
| | - Lesli O Mark
- University of Wisconsin - Madison, Department of Chemistry, Madison, Wisconsin 53706, United States
| | - Ivan Hung
- National High Magnetic Field Laboratory (NHMFL), Tallahassee, Florida 32310, United States
| | - Melissa C Cendejas
- University of Wisconsin - Madison, Department of Chemistry, Madison, Wisconsin 53706, United States
| | - Yijue Xu
- National High Magnetic Field Laboratory (NHMFL), Tallahassee, Florida 32310, United States
| | - Peter L Gor'kov
- National High Magnetic Field Laboratory (NHMFL), Tallahassee, Florida 32310, United States
| | - Wenping Mao
- National High Magnetic Field Laboratory (NHMFL), Tallahassee, Florida 32310, United States
| | - Faysal Ibrahim
- University of Wisconsin - Madison, Department of Chemistry, Madison, Wisconsin 53706, United States
| | - Zhehong Gan
- National High Magnetic Field Laboratory (NHMFL), Tallahassee, Florida 32310, United States
| | - Ive Hermans
- University of Wisconsin - Madison, Department of Chemistry, Madison, Wisconsin 53706, United States.,University of Wisconsin - Madison, Department of Chemical and Biological Engineering, Madison, Wisconsin 53706, United States
| | - Aaron J Rossini
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
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20
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Samudrala KK, Huynh W, Dorn RW, Rossini AJ, Conley MP. Formation of a Strong Heterogeneous Aluminum Lewis Acid on Silica. Angew Chem Int Ed Engl 2022; 61:e202205745. [DOI: 10.1002/anie.202205745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Indexed: 11/10/2022]
Affiliation(s)
| | - Winn Huynh
- Department of Chemistry University of California, Riverside Riverside CA 92521 USA
| | - Rick W. Dorn
- Department of Chemistry Iowa State University Ames IA 50011 USA
- U.S. Department of Energy Ames Laboratory Ames IA 50011 USA
| | - Aaron J. Rossini
- Department of Chemistry Iowa State University Ames IA 50011 USA
- U.S. Department of Energy Ames Laboratory Ames IA 50011 USA
| | - Matthew P. Conley
- Department of Chemistry University of California, Riverside Riverside CA 92521 USA
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21
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Bhaskar G, Gvozdetskyi V, Carnahan SL, Wang R, Mantravadi A, Wu X, Ribeiro RA, Huang W, Rossini AJ, Ho KM, Canfield PC, Lebedev OI, Zaikina JV. Path Less Traveled: A Contemporary Twist on Synthesis and Traditional Structure Solution of Metastable LiNi 12B 8. ACS Mater Au 2022; 2:614-625. [PMID: 36124003 PMCID: PMC9480833 DOI: 10.1021/acsmaterialsau.2c00033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gourab Bhaskar
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | | | - Scott L. Carnahan
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States
| | - Renhai Wang
- Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States
- School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | | | - Xun Wu
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States
| | - Raquel A. Ribeiro
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States
| | - Wenyu Huang
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States
| | - Aaron J. Rossini
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States
| | - Kai-Ming Ho
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States
| | - Paul C. Canfield
- Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States
| | - Oleg I. Lebedev
- Laboratoire CRISMAT, ENSICAEN, CNRS UMR 650814050, Caen 14050, France
| | - Julia V. Zaikina
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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22
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Roth AN, Chen Y, Adamson MAS, Gi E, Wagner M, Rossini AJ, Vela J. Alkaline-Earth Chalcogenide Nanocrystals: Solution-Phase Synthesis, Surface Chemistry, and Stability. ACS Nano 2022; 16:12024-12035. [PMID: 35849721 DOI: 10.1021/acsnano.2c02116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Increasing demand for effective energy conversion materials and devices has renewed interest in semiconductors comprised of earth-abundant and biocompatible elements. Alkaline-earth sulfides doped with rare earth ions are versatile optical materials. However, relatively little is known about controlling the dimensionality, surface chemistry, and inherent optical properties of the undoped versions of alkaline-earth mono- and polychalcogenides. We describe the colloidal synthesis of alkaline-earth chalcogenide nanocrystals through the reaction of metal carboxylates with carbon disulfide or selenourea. Systematic exploration of the synthetic phase space allows us to tune particle sizes over a wide range using a mixture of commercially available carboxylate precursors. Solid-state NMR spectroscopy confirms the phase purity of the selenide compositions. Surface characterization reveals that bridging carboxylates and amines preferentially terminate the surface of the nanocrystals. While these materials are colloidally stable in the mother solution, the selenides are susceptible to oxidation over time, eventually degrading to selenium metal through polyselenide intermediates. As part of these investigations, we have developed the colloidal syntheses of barium di- and triselenides, two among few reported nanocrystalline alkaline-earth polychalcogenides. Electronic structure calculations reveal that both materials are indirect band gap semiconductors. The colloidal chemistry presented here may enable the synthesis of more complex, multinary chalcogenide materials containing alkaline-earth elements.
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Affiliation(s)
- Alison N Roth
- US DOE Ames Laboratory, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Yunhua Chen
- US DOE Ames Laboratory, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Marquix A S Adamson
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Eunbyeol Gi
- US DOE Ames Laboratory, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Molly Wagner
- US DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - Aaron J Rossini
- US DOE Ames Laboratory, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Javier Vela
- US DOE Ames Laboratory, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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23
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Dorn RW, Wall BJ, Ference SB, Norris SR, Lubach JW, Rossini AJ, VanVeller B. Attached Nitrogen Test by 13C- 14N Solid-State NMR Spectroscopy for the Structure Determination of Heterocyclic Isomers. Org Lett 2022; 24:5635-5640. [PMID: 35731042 PMCID: PMC9933616 DOI: 10.1021/acs.orglett.2c01576] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Differentiation of heterocyclic isomers by solution 1H, 13C, and 15N NMR spectroscopy is often challenging due to similarities in their spectroscopic signatures. Here, 13C{14N} solid-state NMR spectroscopy experiments are shown to operate as an "attached nitrogen test", where heterocyclic isomers are easy to distinguish based on one-dimensional nitrogen-filtered 13C solid-state NMR. We anticipate that these NMR experiments will facilitate the assignment of heterocyclic isomers during synthesis and natural product discovery.
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Affiliation(s)
- Rick W. Dorn
- Iowa State University, Department of Chemistry, Ames, IA, USA, 50011.,US Department of Energy, Ames Laboratory, Ames, IS, USA, 50011
| | - Brendan J. Wall
- Iowa State University, Department of Chemistry, Ames, IA, USA, 50011
| | - Sarah B. Ference
- Iowa State University, Department of Chemistry, Ames, IA, USA, 50011
| | - Sean R. Norris
- Iowa State University, Department of Chemistry, Ames, IA, USA, 50011
| | | | - Aaron J. Rossini
- Iowa State University, Department of Chemistry, Ames, IA, USA, 50011.,US Department of Energy, Ames Laboratory, Ames, IS, USA, 50011.,Corresponding Author, 515-294-8952 , 515-294-7613
| | - Brett VanVeller
- Iowa State University, Department of Chemistry, Ames, IA, USA, 50011.,Corresponding Author, 515-294-8952 , 515-294-7613
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24
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Conley M, Samudrala KK, Huynh W, Dorn RW, Rossini AJ. Formation of a Strong Heterogeneous Aluminum Lewis Acid on Silica. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Matthew Conley
- University of California, Riverside Chemistry 501 Big Springs Rd 92521 Riverside UNITED STATES
| | | | - Winn Huynh
- University of California Riverside Chemistry UNITED STATES
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25
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Venkatesh A, Gioffrè D, Atterberry BA, Rochlitz L, Carnahan SL, Wang Z, Menzildjian G, Lesage A, Copéret C, Rossini AJ. Molecular and Electronic Structure of Isolated Platinum Sites Enabled by the Expedient Measurement of 195Pt Chemical Shift Anisotropy. J Am Chem Soc 2022; 144:13511-13525. [PMID: 35861681 DOI: 10.1021/jacs.2c02300] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Techniques that can characterize the molecular structures of dilute surface species are required to facilitate the rational synthesis and improvement of Pt-based heterogeneous catalysts. 195Pt solid-state NMR spectroscopy could be an ideal tool for this task because 195Pt isotropic chemical shifts and chemical shift anisotropy (CSA) are highly sensitive probes of the local chemical environment and electronic structure. However, the characterization of Pt surface-sites is complicated by the typical low Pt loadings that are between 0.2 and 5 wt% and broadening of 195Pt solid-state NMR spectra by CSA. Here, we introduce a set of solid-state NMR methods that exploit fast MAS and indirect detection using a sensitive spy nucleus (1H or 31P) to enable the rapid acquisition of 195Pt MAS NMR spectra. We demonstrate that high-resolution wideline 195Pt MAS NMR spectra can be acquired in minutes to a few hours for a series of molecular and single-site Pt species grafted on silica with Pt loading of only 3-5 wt%. Low-power, long-duration, sideband-selective excitation, and saturation pulses are incorporated into t1-noise eliminated dipolar heteronuclear multiple quantum coherence, perfect echo resonance echo saturation pulse double resonance, or J-resolved pulse sequences. The complete 195Pt MAS NMR spectrum is then reconstructed by recording a series of 1D NMR spectra where the offset of the 195Pt pulses is varied in increments of the MAS frequency. Analysis of the 195Pt MAS NMR spectra yields the 195Pt chemical shift tensor parameters. Zeroth order approximation density functional theory calculations accurately predict 195Pt CS tensor parameters. Simple and predictive orbital models relate the CS tensor parameters to the Pt electronic structure and coordination environment. The methodology developed here paves the way for the detailed structural and electronic analysis of dilute platinum surface-sites.
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Affiliation(s)
- Amrit Venkatesh
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,US DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - Domenico Gioffrè
- Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Benjamin A Atterberry
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,US DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - Lukas Rochlitz
- Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Scott L Carnahan
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,US DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - Zhuoran Wang
- Univ Lyon, ENS Lyon, Université Lyon 1, CNRS, High-Field NMR Center of Lyon, UMR 5082, F-69100 Villeurbanne, France
| | - Georges Menzildjian
- Univ Lyon, ENS Lyon, Université Lyon 1, CNRS, High-Field NMR Center of Lyon, UMR 5082, F-69100 Villeurbanne, France
| | - Anne Lesage
- Univ Lyon, ENS Lyon, Université Lyon 1, CNRS, High-Field NMR Center of Lyon, UMR 5082, F-69100 Villeurbanne, France
| | - Christophe Copéret
- Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Aaron J Rossini
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,US DOE Ames Laboratory, Ames, Iowa 50011, United States
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26
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Carnahan SL, Chen Y, Wishart JF, Lubach JW, Rossini AJ. Magic angle spinning dynamic nuclear polarization solid-state NMR spectroscopy of γ-irradiated molecular organic solids. Solid State Nucl Magn Reson 2022; 119:101785. [PMID: 35405629 DOI: 10.1016/j.ssnmr.2022.101785] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2021] [Revised: 02/22/2022] [Accepted: 03/04/2022] [Indexed: 06/14/2023]
Abstract
In the past 15 years, magic angle spinning (MAS) dynamic nuclear polarization (DNP) has emerged as a method to increase the sensitivity of high-resolution solid-state NMR spectroscopy experiments. Recently, γ-irradiation has been used to generate significant concentrations of homogeneously distributed free radicals in a variety of solids, including quartz, glucose, and cellulose. Both γ-irradiated quartz and glucose previously showed significant MAS DNP enhancements. Here, γ-irradiation is applied to twelve small organic molecules to test the applicability of γ-irradiation as a general method of creating stable free radicals for MAS DNP experiments on organic solids and pharmaceuticals. Radical concentrations in the range of 0.25 mM-10 mM were observed in irradiated glucose, histidine, malic acid, and malonic acid, and significant 1H DNP enhancements of 32, 130, 19, and 11 were obtained, respectively, as measured by 1H→13C CPMAS experiments. However, concentrations of free radicals below 0.05 mM were generally observed in organic molecules containing aromatic rings, preventing sizeable DNP enhancements. DNP sensitivity gains for several of the irradiated compounds exceed that which can be obtained with the relayed DNP approach that uses exogeneous polarizing agent solutions and impregnation procedures. In several cases, significant 1H DNP enhancements were realized at room temperature. This study demonstrates that in many cases γ-irradiation is a viable alternative to addition of stable exogenous radicals for DNP experiments on organic solids.
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Affiliation(s)
- Scott L Carnahan
- US DOE Ames Laboratory, Ames, IA, 50011, USA; Iowa State University, Department of Chemistry, Ames, IA, 50011, USA
| | - Yunhua Chen
- US DOE Ames Laboratory, Ames, IA, 50011, USA; Iowa State University, Department of Chemistry, Ames, IA, 50011, USA
| | - James F Wishart
- Brookhaven National Laboratory, Chemistry Division, Upton, NY, 11973, United States
| | - Joseph W Lubach
- Genentech Inc., South San Francisco, CA, 94080, United States
| | - Aaron J Rossini
- US DOE Ames Laboratory, Ames, IA, 50011, USA; Iowa State University, Department of Chemistry, Ames, IA, 50011, USA.
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27
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Gao J, Dorn RW, Laurent GP, Perras FA, Rossini AJ, Conley MP. A Heterogeneous Palladium Catalyst for the Polymerization of Olefins Prepared by Halide Abstraction Using Surface R
3
Si
+
Species. Angew Chem Int Ed Engl 2022; 61:e202117279. [DOI: 10.1002/anie.202117279] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Indexed: 11/12/2022]
Affiliation(s)
- Jiaxin Gao
- Department of Chemistry University of California, Riverside Riverside CA 92521 USA
| | - Rick W. Dorn
- Department of Chemistry Iowa State University Ames IA 50011 USA
- U.S. Department of Energy Ames Laboratory Ames IA 50011 USA
| | - Guillaume P. Laurent
- U.S. Department of Energy Ames Laboratory Ames IA 50011 USA
- CNRS Laboratoire de Chimie de la Matière Condensée de Paris Sorbonne Université, LCMCP 75005 Paris France
| | | | - Aaron J. Rossini
- Department of Chemistry Iowa State University Ames IA 50011 USA
- U.S. Department of Energy Ames Laboratory Ames IA 50011 USA
| | - Matthew P. Conley
- Department of Chemistry University of California, Riverside Riverside CA 92521 USA
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28
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Daniels CL, Gi E, Atterberry BA, Blome-Fernández R, Rossini AJ, Vela J. Phosphine Ligand Binding and Catalytic Activity of Group 10-14 Heterobimetallic Complexes. Inorg Chem 2022; 61:6888-6897. [PMID: 35481778 DOI: 10.1021/acs.inorgchem.2c00229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Heterobimetallic complexes have attracted much interest due to their broad range of structures and reactivities as well as unique catalytic abilities. Additionally, these complexes can be utilized as single-source precursors for the synthesis of binary intermetallic compounds. An example is the family of bis(pyridine-2-thiolato)dichloro-germanium and tin complexes of group 10 metals (Pd and Pt). The reactivity of these heterobimetallic complexes is highly tunable through substitution of the group 14 element and the neutral ligand bound to the transition metal. Here, we study the binding energies of three different phosphorous-based ligands, PR3 (R = Bu, Ph, and OPh) by density functional theory and restricted Hartree-Fock methods. The PR3 ligand-binding energies follow the trend of PBu3 > PPh3 > P(OPh)3, in agreement with their sigma-bonding ability. These results are confirmed by ligand exchange experiments monitored with 31P NMR spectroscopy, in which a weaker binding PR3 ligand is replaced with a stronger one. Furthermore, we demonstrate that the heterobimetallic complexes are active catalysts in the Negishi coupling reaction, where stronger binding PR3 ligands inhibit access to an active site at the metal center. Similar strategies could be applied to other complexes to better understand their ligand-binding energetics and predict their reactivity as both precursors and catalysts.
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Affiliation(s)
- Carena L Daniels
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Eunbyeol Gi
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,US DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - Benjamin A Atterberry
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,US DOE Ames Laboratory, Ames, Iowa 50011, United States
| | | | - Aaron J Rossini
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,US DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - Javier Vela
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,US DOE Ames Laboratory, Ames, Iowa 50011, United States
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29
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Perras FA, Carnahan SL, Lo WS, Ward CJ, Yu J, Huang W, Rossini AJ. Hybrid quantum-classical simulations of magic angle spinning dynamic nuclear polarization in very large spin systems. J Chem Phys 2022; 156:124112. [DOI: 10.1063/5.0086530] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Solid-state nuclear magnetic resonance can be enhanced using unpaired electron spins with a method known as dynamic nuclear polarization (DNP). Fundamentally, DNP involves ensembles of thousands of spins, a scale that is difficult to match computationally. This scale prevents us from gaining a complete understanding of the spin dynamics and applying simulations to design sample formulations. We recently developed an ab initio model capable of calculating DNP enhancements in systems of up to ∼1000 nuclei; however, this scale is insufficient to accurately simulate the dependence of DNP enhancements on radical concentration or magic angle spinning (MAS) frequency. We build on this work by using ab initio simulations to train a hybrid model that makes use of a rate matrix to treat nuclear spin diffusion. We show that this model can reproduce the MAS rate and concentration dependence of DNP enhancements and build-up time constants. We then apply it to predict the DNP enhancements in core–shell metal-organic-framework nanoparticles and reveal new insights into the composition of the particles’ shells.
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Affiliation(s)
| | - Scott L. Carnahan
- Ames Laboratory, U.S. DOE, Ames, Iowa 50011, USA
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA
| | - Wei-Shang Lo
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, USA
| | - Charles J. Ward
- Ames Laboratory, U.S. DOE, Ames, Iowa 50011, USA
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA
| | - Jiaqi Yu
- Ames Laboratory, U.S. DOE, Ames, Iowa 50011, USA
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA
| | - Wenyu Huang
- Ames Laboratory, U.S. DOE, Ames, Iowa 50011, USA
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA
| | - Aaron J. Rossini
- Ames Laboratory, U.S. DOE, Ames, Iowa 50011, USA
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA
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30
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Gao J, Dorn RW, Laurent GP, Perras FA, Rossini AJ, Conley MP. A Heterogeneous Palladium Catalyst for the Polymerization of Olefins Prepared by Halide Abstraction Using Surface R
3
Si
+
Species. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202117279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jiaxin Gao
- Department of Chemistry University of California, Riverside Riverside CA 92521 USA
| | - Rick W. Dorn
- Department of Chemistry Iowa State University Ames IA 50011 USA
- U.S. Department of Energy Ames Laboratory Ames IA 50011 USA
| | - Guillaume P. Laurent
- U.S. Department of Energy Ames Laboratory Ames IA 50011 USA
- CNRS Laboratoire de Chimie de la Matière Condensée de Paris Sorbonne Université, LCMCP 75005 Paris France
| | | | - Aaron J. Rossini
- Department of Chemistry Iowa State University Ames IA 50011 USA
- U.S. Department of Energy Ames Laboratory Ames IA 50011 USA
| | - Matthew P. Conley
- Department of Chemistry University of California, Riverside Riverside CA 92521 USA
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31
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Atterberry BA, Carnahan SL, Chen Y, Venkatesh A, Rossini AJ. Double echo symmetry-based REDOR and RESPDOR pulse sequences for proton detected measurements of heteronuclear dipolar coupling constants. J Magn Reson 2022; 336:107147. [PMID: 35149335 DOI: 10.1016/j.jmr.2022.107147] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 01/10/2022] [Accepted: 01/12/2022] [Indexed: 06/14/2023]
Abstract
1H{X} symmetry-based rotational echo double resonance pulse sequences (S-REDOR) and symmetry-based rotational echo saturation pulse double resonance (S-RESPDOR) solid-state NMR experiments have found widespread application for 1H detected measurements of difference NMR spectra, dipolar coupling constants, and internuclear distances under conditions of fast magic angle spinning (MAS). In these experiments the supercycled R412 (SR412) symmetry-based recoupling pulse sequence is typically applied to the 1H spins to reintroduce heteronuclear dipolar couplings. However, the timing of SR412 and other symmetry-based pulse sequences must be precisely synchronized with the rotation of the sample, otherwise, the evolution of 1H CSA and other interactions will not be properly refocused. For this reason, significant distortions are often observed in experimental dipolar dephasing difference curves obtained with S-REDOR or S-RESPDOR pulse sequences. Here we introduce a family of double echo (DE) S-REDOR/S-RESPDOR pulse sequences that function in an analogous manner to the recently introduced t1-noise eliminated (TONE) family of dipolar heteronuclear multiple quantum coherence (D-HMQC) pulse sequences. Through numerical simulations and experiments the DE S-REDOR/S-RESPDOR sequences are shown to provide dephasing difference curves similar to those obtained with S-REDOR/S-RESPDOR. However, the DE sequences are more robust to the deviations of the MAS frequency from the ideal value that occurs during typical solid-state NMR experiments. The DE sequences are shown to provide more reliable 1H detected dipolar dephasing difference curves for nuclei such as 15N (with isotopic labelling), 183W and 35Cl. The double echo sequences are therefore recommended to be used in place of conventional S-REDOR/S-RESPDOR sequences for measurement of weak dipolar coupling constants and long-range distances.
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Affiliation(s)
- Benjamin A Atterberry
- US DOE Ames Laboratory, Ames, IA 50011, USA; Iowa State University, Department of Chemistry, Ames, IA 50011, USA
| | - Scott L Carnahan
- US DOE Ames Laboratory, Ames, IA 50011, USA; Iowa State University, Department of Chemistry, Ames, IA 50011, USA
| | - Yunhua Chen
- US DOE Ames Laboratory, Ames, IA 50011, USA; Iowa State University, Department of Chemistry, Ames, IA 50011, USA
| | - Amrit Venkatesh
- US DOE Ames Laboratory, Ames, IA 50011, USA; Iowa State University, Department of Chemistry, Ames, IA 50011, USA
| | - Aaron J Rossini
- US DOE Ames Laboratory, Ames, IA 50011, USA; Iowa State University, Department of Chemistry, Ames, IA 50011, USA.
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32
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Ji B, Wu K, Chen Y, Wang F, Rossini AJ, Zhang B, Wang J. Ba 6(Cu xZ y)Sn 4S 16 (Z = Mg, Mn, Zn, Cd, In, Bi, Sn): High Chemical Flexibility Resulting in Good Nonlinear-Optical Properties. Inorg Chem 2022; 61:2640-2651. [PMID: 35080173 DOI: 10.1021/acs.inorgchem.1c03773] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Seven acentric sulfides Ba6(CuxZy)Sn4S16 (Z = Mg, Mn, Zn, Cd, In, Bi, Sn) were grown by a high-temperature salt flux method. The crystal structures of the Ba6(CuxZy)Sn4S16 (Z = Mg, Mn, Zn, Cd, In, Bi, Sn) compounds were determined by single-crystal X-ray diffraction with the aid of solid-state NMR spectroscopy. The Ba6(CuxZy)Sn4S16 (Z = Mg, Mn, Zn, Cd, In, Bi) compounds are isostructural and crystallize in the Ba6Ag4Sn4S16 structure type. The Sn-containing compound exhibits high structural similarity to Ba6(CuxZy)Sn4S16 (Z = Mg, Mn, Zn, Cd, In, Bi) with the presence of an interstitial atomic position partially occupied by Sn atoms. The chemical bonding characteristics of Ba6(Cu2.9Sn0.4)Sn4S16 were understood with electron localization function calculations coupled with crystal orbital Hamilton population calculations. The Ba-S and Cu-S interactions are dominantly ionic, but the Sn-S interactions consist of strong covalent bonding characteristics in Ba6(Cu2.9Sn0.4)Sn4S16. The monovalent Cu atoms, mixed with certain metals with various oxidation states, significantly shift the optical properties of the Ba6(CuxZy)Sn4S16 (Z = Mg, Mn, Zn, Cd, In, Bi) compounds. This results in a good balance between the second-harmonic-generation (SHG) response and laser damage threshold (LDT). Ba6(Cu1.9Zn1.1)Sn4S16 possesses a high SHG response and a high LDT of 2.8 × AGS and 3 × AGS, respectively. A density functional theory calculation revealed that CuS4 and SnS4 tetrahedra significantly contribute to the SHG response in Ba6(Cu2Mg)Sn4S16, which also confirmed that CuS4 tetrahedra are crucial for the stability and optical properties of the Ba6(CuxZy)Sn4S16 (Z = Mg, Mn, Zn, Cd, In, Bi, Sn) compounds revealed by electronic structure analysis.
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Affiliation(s)
- Bingheng Ji
- Department of Chemistry and Biochemistry, Wichita State University, Wichita, Kansas 67260, United States
| | - Kui Wu
- Key Laboratory of Analytical Science and Technology of Hebei Province, College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China
| | - Yunhua Chen
- U.S. Department of Energy Ames Laboratory, Ames, Iowa 50011, United States.,Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Fei Wang
- Department of Chemistry, Missouri State University, Springfield, Missouri 65897, United States
| | - Aaron J Rossini
- U.S. Department of Energy Ames Laboratory, Ames, Iowa 50011, United States.,Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Bingbing Zhang
- Key Laboratory of Analytical Science and Technology of Hebei Province, College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China
| | - Jian Wang
- Department of Chemistry and Biochemistry, Wichita State University, Wichita, Kansas 67260, United States
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33
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34
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Yox P, Porter A, Dorn R, Kyveryga V, Rossini AJ, Kovnir K. Semiconducting silicon-phosphorous frameworks for caging exotic polycations. Chem Commun (Camb) 2022; 58:7622-7625. [DOI: 10.1039/d2cc02304k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of novel semiconductors AAe6Si12P20X (A = Na, K, Rb, Cs; Ae = Sr, Ba; X = Cl, Br, I) is reported. Their crystal structures feature tetrahedral Si-P framework...
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35
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Mark LO, Dorn RW, McDermott WP, Agbi TO, Altvater NR, Jansen J, Lebrón‐Rodríguez EA, Cendejas MC, Rossini AJ, Hermans I. Cover Feature: Highly Selective Carbon‐Supported Boron for Oxidative Dehydrogenation of Propane (ChemCatChem 16/2021). ChemCatChem 2021. [DOI: 10.1002/cctc.202101095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Lesli O. Mark
- Department of Chemistry University of Wisconsin – Madison 1101 University Avenue Madison WI 53706 USA
| | - Rick W. Dorn
- Department of Chemistry Iowa State University 2438 Pammel Dr. Ames IA 50011 USA
- U.S. Department of Energy Ames Laboratory 3111 Iowa State University Ames IA 50011 USA
| | - William P. McDermott
- Department of Chemistry University of Wisconsin – Madison 1101 University Avenue Madison WI 53706 USA
| | - Theodore O. Agbi
- Department of Chemical and Biological Engineering University of Wisconsin – Madison 1415 Engineering Dr. Madison WI 53706 USA
| | - Natalie R. Altvater
- Department of Chemical and Biological Engineering University of Wisconsin – Madison 1415 Engineering Dr. Madison WI 53706 USA
| | - Jacob Jansen
- Department of Chemistry University of Wisconsin – Madison 1101 University Avenue Madison WI 53706 USA
| | - Edgard A. Lebrón‐Rodríguez
- Department of Chemical and Biological Engineering University of Wisconsin – Madison 1415 Engineering Dr. Madison WI 53706 USA
| | - Melissa C. Cendejas
- Department of Chemistry University of Wisconsin – Madison 1101 University Avenue Madison WI 53706 USA
| | - Aaron J. Rossini
- Department of Chemistry Iowa State University 2438 Pammel Dr. Ames IA 50011 USA
- U.S. Department of Energy Ames Laboratory 3111 Iowa State University Ames IA 50011 USA
| | - Ive Hermans
- Department of Chemistry University of Wisconsin – Madison 1101 University Avenue Madison WI 53706 USA
- Department of Chemical and Biological Engineering University of Wisconsin – Madison 1415 Engineering Dr. Madison WI 53706 USA
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36
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Culver D, Dorn RW, Venkatesh A, Meeprasert J, Rossini AJ, Pidko EA, Lipton AS, Lief GR, Conley MP. Active Sites in a Heterogeneous Organometallic Catalyst for the Polymerization of Ethylene. ACS Cent Sci 2021; 7:1225-1231. [PMID: 34345672 PMCID: PMC8323245 DOI: 10.1021/acscentsci.1c00466] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Indexed: 06/13/2023]
Abstract
Heterogeneous derivatives of catalysts discovered by Ziegler and Natta are important for the industrial production of polyolefin plastics. However, the interaction between precatalysts, alkylaluminum activators, and oxide supports to form catalytically active materials is poorly understood. This is in contrast to homogeneous or model heterogeneous catalysts that contain resolved molecular structures that relate to activity and selectivity in polymerization reactions. This study describes the reactivity of triisobutylaluminum with high surface area aluminum oxide and a zirconocene precatalyst. Triisobutylaluminum reacts with the zirconocene precatalyst to form hydrides and passivates -OH sites on the alumina surface. The combination of passivated alumina and zirconium hydrides formed in this mixture generates ion pairs that polymerize ethylene.
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Affiliation(s)
- Damien
B. Culver
- Department
of Chemistry, University of California, Riverside, California 92507, United States
| | - Rick W. Dorn
- Department
of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Amrit Venkatesh
- Department
of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Jittima Meeprasert
- Inorganic
Systems Engineering Group, Department of Chemical Engineering, Faculty
of Applied Sciences, Delft University of
Technology, Van der Maasweg 9, Delft 2629 HZ, The Netherlands
| | - Aaron J. Rossini
- Department
of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Evgeny A. Pidko
- Inorganic
Systems Engineering Group, Department of Chemical Engineering, Faculty
of Applied Sciences, Delft University of
Technology, Van der Maasweg 9, Delft 2629 HZ, The Netherlands
| | - Andrew S. Lipton
- Environmental
Molecular Sciences Laboratory, Pacific Northwest
National Laboratory, Richland, Washington 99354, United States
| | - Graham R. Lief
- Bartlesville
Research and Technology Center, Chevron
Phillips Chemical, Bartlesville, Oklahoma 74003, United States
| | - Matthew P. Conley
- Department
of Chemistry, University of California, Riverside, California 92507, United States
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37
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Medina-Gonzalez AM, Yox P, Chen Y, Adamson MAS, Svay M, Smith EA, Schaller RD, Rossini AJ, Vela J. Ternary ACd 4P 3 (A = Na, K) Nanostructures via a Hydride Solution-Phase Route. ACS Mater Au 2021; 1:130-139. [PMID: 36855397 PMCID: PMC9888649 DOI: 10.1021/acsmaterialsau.1c00018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Complex pnictides such as I-II4-V3 compounds (I = alkali metal; II = divalent transition metal; V = pnictide element) display rich structural chemistry and interesting optoelectronic properties, but can be challenging to synthesize using traditional high-temperature solid-state synthesis. Soft chemistry methods can offer control over particle size, morphology, and properties. However, the synthesis of multinary pnictides from solution remains underdeveloped. Here, we report the colloidal hot-injection synthesis of ACd4P3 (A = Na, K) nanostructures from their alkali metal hydrides (AH). Control studies indicate that NaCd4P3 forms from monometallic Cd0 seeds and not from binary Cd3P2 nanocrystals. IR and ssNMR spectroscopy reveal tri-n-octylphosphine oxide (TOPO) and related ligands are coordinated to the ternary surface. Computational studies show that competing phases with space group symmetries R3̅m and Cm differ by only 30 meV/formula unit, indicating that synthetic access to either of these polymorphs is possible. Our synthesis unlocks a new family of nanoscale multinary pnictide materials that could find use in optoelectronic and energy conversion devices.
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Affiliation(s)
| | - Philip Yox
- Department
of Chemistry Iowa State University, Ames, Iowa 50011, United States
| | - Yunhua Chen
- Department
of Chemistry Iowa State University, Ames, Iowa 50011, United States,Ames
Laboratory, Iowa State University, Ames, Iowa 50011, United States
| | | | - Maranny Svay
- Department
of Chemistry Iowa State University, Ames, Iowa 50011, United States
| | - Emily A. Smith
- Department
of Chemistry Iowa State University, Ames, Iowa 50011, United States,Ames
Laboratory, Iowa State University, Ames, Iowa 50011, United States
| | - Richard D. Schaller
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States,Center
for Nanoscale Materials, Argonne National
Laboratory, Lemont, Illinois 60439, United
States
| | - Aaron J. Rossini
- Department
of Chemistry Iowa State University, Ames, Iowa 50011, United States,Ames
Laboratory, Iowa State University, Ames, Iowa 50011, United States
| | - Javier Vela
- Department
of Chemistry Iowa State University, Ames, Iowa 50011, United States,Ames
Laboratory, Iowa State University, Ames, Iowa 50011, United States,
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38
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Mark LO, Dorn RW, McDermott WP, Agbi TO, Altvater NR, Jansen J, Lebrón‐Rodríguez EA, Cendejas MC, Rossini AJ, Hermans I. Highly Selective Carbon‐Supported Boron for Oxidative Dehydrogenation of Propane. ChemCatChem 2021. [DOI: 10.1002/cctc.202100759] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Lesli O. Mark
- Department of Chemistry University of Wisconsin – Madison 1101 University Avenue Madison WI 53706 USA
| | - Rick W. Dorn
- Department of Chemistry Iowa State University 2438 Pammel Dr. Ames IA 50011 USA
- U.S. Department of Energy Ames Laboratory 3111 Iowa State University Ames IA 50011 USA
| | - William P. McDermott
- Department of Chemistry University of Wisconsin – Madison 1101 University Avenue Madison WI 53706 USA
| | - Theodore O. Agbi
- Department of Chemical and Biological Engineering University of Wisconsin – Madison 1415 Engineering Dr. Madison WI 53706 USA
| | - Natalie R. Altvater
- Department of Chemical and Biological Engineering University of Wisconsin – Madison 1415 Engineering Dr. Madison WI 53706 USA
| | - Jacob Jansen
- Department of Chemistry University of Wisconsin – Madison 1101 University Avenue Madison WI 53706 USA
| | - Edgard A. Lebrón‐Rodríguez
- Department of Chemical and Biological Engineering University of Wisconsin – Madison 1415 Engineering Dr. Madison WI 53706 USA
| | - Melissa C. Cendejas
- Department of Chemistry University of Wisconsin – Madison 1101 University Avenue Madison WI 53706 USA
| | - Aaron J. Rossini
- Department of Chemistry Iowa State University 2438 Pammel Dr. Ames IA 50011 USA
- U.S. Department of Energy Ames Laboratory 3111 Iowa State University Ames IA 50011 USA
| | - Ive Hermans
- Department of Chemistry University of Wisconsin – Madison 1101 University Avenue Madison WI 53706 USA
- Department of Chemical and Biological Engineering University of Wisconsin – Madison 1415 Engineering Dr. Madison WI 53706 USA
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39
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Boteju KC, Venkatesh A, Chu YY, Wan S, Ellern A, Rossini AJ, Sadow AD. Ancillary Steric Effects on the Activation of SiH Bonds in Arylsilazido Rare-Earth Compounds. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00162] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kasuni C. Boteju
- US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Amrit Venkatesh
- US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Yang-Yun Chu
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Suchen Wan
- US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Aaron J. Rossini
- US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- US Department of Energy Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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40
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Chen Y, Dorn RW, Hanrahan MP, Wei L, Blome-Fernández R, Medina-Gonzalez AM, Adamson MAS, Flintgruber AH, Vela J, Rossini AJ. Revealing the Surface Structure of CdSe Nanocrystals by Dynamic Nuclear Polarization-Enhanced 77Se and 113Cd Solid-State NMR Spectroscopy. J Am Chem Soc 2021; 143:8747-8760. [PMID: 34085812 DOI: 10.1021/jacs.1c03162] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Dynamic nuclear polarization (DNP) solid-state NMR (SSNMR) spectroscopy was used to obtain detailed surface structures of zinc blende CdSe nanocrystals (NCs) with plate or spheroidal morphologies which are capped by carboxylic acid ligands. 1D 113Cd and 77Se cross-polarization magic angle spinning (CPMAS) NMR spectra revealed distinct signals from Cd and Se atoms on the surface of the NCs, and those residing in bulk-like environments, below the surface. 113Cd cross-polarization magic-angle-turning (CP-MAT) experiments identified CdSe3O, CdSe2O2, and CdSeO3 Cd coordination environments on the surface of the NCs, where the oxygen atoms are presumably from coordinated carboxylate ligands. The sensitivity gain from DNP enabled natural isotopic abundance 2D homonuclear 113Cd-113Cd and 77Se-77Se and heteronuclear 113Cd-77Se scalar correlation solid-state NMR experiments which revealed the connectivity of the Cd and Se atoms. Importantly, 77Se{113Cd} scalar heteronuclear multiple quantum coherence (J-HMQC) experiments were used to selectively measure one-bond 77Se-113Cd scalar coupling constants (1J(77Se, 113Cd)). With knowledge of 1J(77Se, 113Cd), heteronuclear 77Se{113Cd} spin echo (J-resolved) NMR experiments were used to determine the number of Cd atoms bonded to Se atoms and vice versa. The J-resolved experiments directly confirmed that major Cd and Se surface species have CdSe2O2 and SeCd4 stoichiometries, respectively. Considering the crystal structure of zinc blende CdSe and the similarity of the solid-state NMR data for the platelets and spheroids, we conclude that the surface of the spheroidal CdSe NCs is primarily composed of {100} facets. The methods outlined here will generally be applicable to obtain detailed surface structures of various main group semiconductor nanoparticles.
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Affiliation(s)
- Yunhua Chen
- U.S. Department of Energy Ames Laboratory, Ames, Iowa 50011, United States.,Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Rick W Dorn
- U.S. Department of Energy Ames Laboratory, Ames, Iowa 50011, United States.,Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Michael P Hanrahan
- U.S. Department of Energy Ames Laboratory, Ames, Iowa 50011, United States.,Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Lin Wei
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | | | | | - Marquix A S Adamson
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Anne H Flintgruber
- U.S. Department of Energy Ames Laboratory, Ames, Iowa 50011, United States
| | - Javier Vela
- U.S. Department of Energy Ames Laboratory, Ames, Iowa 50011, United States.,Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Aaron J Rossini
- U.S. Department of Energy Ames Laboratory, Ames, Iowa 50011, United States.,Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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41
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Venkatesh A, Perras FA, Rossini AJ. Proton-detected solid-state NMR spectroscopy of spin-1/2 nuclei with large chemical shift anisotropy. J Magn Reson 2021; 327:106983. [PMID: 33964731 DOI: 10.1016/j.jmr.2021.106983] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/05/2021] [Accepted: 04/10/2021] [Indexed: 06/12/2023]
Abstract
Constant-time (CT) dipolar heteronuclear multiple quantum coherence (D-HMQC) has previously been demonstrated as a method for proton detection of high-resolution wideline NMR spectra of spin-1/2 nuclei with large chemical shift anisotropy (CSA). However, 1H transverse relaxation and t1-noise often reduce the sensitivity of D-HMQC experiments, preventing the theoretical gains in sensitivity provided by 1H detection from being realized. Here we demonstrate a series of improved pulse sequences for 1H detection of spin-1/2 nuclei under fast MAS, with 195Pt SSNMR experiments on cisplatin as an example. First, a t1-incrementation protocol for D-HMQC dubbed Arbitrary Indirect Dwell (AID) is demonstrated. AID allows the use of arbitrary, rotor asynchronous t1-increments, but removes the constant time period from CT D-HMQC, resulting in improved sensitivity by reducing transverse relaxation losses. Next, we show that short high-power adiabatic pulses (SHAPs), which efficiently invert broad MAS sideband manifolds, can be effectively incorporated into 1H detected symmetry-based resonance echo double resonance (S-REDOR) and t1-noise eliminated (TONE) D-HMQC experiments. The S-REDOR experiments with SHAPs provide approximately double the dipolar dephasing, as compared to experiments with rectangular inversion pulses. We lastly show that sensitivity and resolution can be further enhanced with the use of swept excitation pulses as well as adiabatic magic angle turning (aMAT).
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Affiliation(s)
- Amrit Venkatesh
- US DOE Ames Laboratory, Ames, IA 50011, USA; Iowa State University, Department of Chemistry, Ames, IA 50011, USA
| | | | - Aaron J Rossini
- US DOE Ames Laboratory, Ames, IA 50011, USA; Iowa State University, Department of Chemistry, Ames, IA 50011, USA.
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42
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Walz Mitra KL, Chang CH, Hanrahan MP, Yang J, Tofan D, Holden WM, Govind N, Seidler GT, Rossini AJ, Velian A. Surface Functionalization of Black Phosphorus with Nitrenes: Identification of P=N Bonds by Using Isotopic Labeling. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202016033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Kendahl L. Walz Mitra
- Department of Chemistry University of Washington 4000 15th Ave NE Seattle WA 98195 USA
| | - Christine H. Chang
- Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA
| | - Michael P. Hanrahan
- US DOE Ames Laboratory and Department of Chemistry Iowa State University Ames IA 50011 USA
| | - Jiaying Yang
- Department of Chemistry University of Washington 4000 15th Ave NE Seattle WA 98195 USA
| | - Daniel Tofan
- Department of Chemistry University of Washington 4000 15th Ave NE Seattle WA 98195 USA
| | | | | | | | - Aaron J. Rossini
- US DOE Ames Laboratory and Department of Chemistry Iowa State University Ames IA 50011 USA
| | - Alexandra Velian
- Department of Chemistry University of Washington 4000 15th Ave NE Seattle WA 98195 USA
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43
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Walz Mitra KL, Chang CH, Hanrahan MP, Yang J, Tofan D, Holden WM, Govind N, Seidler GT, Rossini AJ, Velian A. Surface Functionalization of Black Phosphorus with Nitrenes: Identification of P=N Bonds by Using Isotopic Labeling. Angew Chem Int Ed Engl 2021; 60:9127-9134. [PMID: 33338295 DOI: 10.1002/anie.202016033] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Indexed: 11/11/2022]
Abstract
Surface functionalization of two-dimensional crystals is a key path to tuning their intrinsic physical and chemical properties. However, synthetic protocols and experimental strategies to directly probe chemical bonding in modified surfaces are scarce. Introduced herein is a mild, surface-specific protocol for the surface functionalization of few-layer black phosphorus nanosheets using a family of photolytically generated nitrenes (RN) from the corresponding azides. By embedding spectroscopic tags in the organic backbone, a multitude of characterization techniques are employed to investigate in detail the chemical structure of the modified nanosheets, including vibrational, X-ray photoelectron, solid state 31 P NMR, and UV-vis spectroscopy. To directly probe the functional groups introduced on the surface, R fragments were selected such that in conjunction with vibrational spectroscopy, 15 N-labeling experiments, and DFT methods, diagnostic P=N vibrational modes indicative of iminophosphorane units on the nanosheet surface could be conclusively identified.
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Affiliation(s)
- Kendahl L Walz Mitra
- Department of Chemistry, University of Washington, 4000 15th Ave NE, Seattle, WA, 98195, USA
| | - Christine H Chang
- Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195, USA
| | - Michael P Hanrahan
- US DOE Ames Laboratory and Department of Chemistry, Iowa State University, Ames, IA, 50011, USA
| | - Jiaying Yang
- Department of Chemistry, University of Washington, 4000 15th Ave NE, Seattle, WA, 98195, USA
| | - Daniel Tofan
- Department of Chemistry, University of Washington, 4000 15th Ave NE, Seattle, WA, 98195, USA
| | - William M Holden
- Department of Physics, University of Washington, Seattle, WA, 98195, USA
| | - Niranjan Govind
- Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Gerald T Seidler
- Department of Physics, University of Washington, Seattle, WA, 98195, USA
| | - Aaron J Rossini
- US DOE Ames Laboratory and Department of Chemistry, Iowa State University, Ames, IA, 50011, USA
| | - Alexandra Velian
- Department of Chemistry, University of Washington, 4000 15th Ave NE, Seattle, WA, 98195, USA
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44
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Bhaskar G, Gvozdetskyi V, Batuk M, Wiaderek KM, Sun Y, Wang R, Zhang C, Carnahan SL, Wu X, Ribeiro RA, Bud'ko SL, Canfield PC, Huang W, Rossini AJ, Wang CZ, Ho KM, Hadermann J, Zaikina JV. Topochemical Deintercalation of Li from Layered LiNiB: toward 2D MBene. J Am Chem Soc 2021; 143:4213-4223. [PMID: 33719436 DOI: 10.1021/jacs.0c11397] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The pursuit of two-dimensional (2D) borides, MBenes, has proven to be challenging, not the least because of the lack of a suitable precursor prone to the deintercalation. Here, we studied room-temperature topochemical deintercalation of lithium from the layered polymorphs of the LiNiB compound with a considerable amount of Li stored in between [NiB] layers (33 at. % Li). Deintercalation of Li leads to novel metastable borides (Li∼0.5NiB) with unique crystal structures. Partial removal of Li is accomplished by exposing the parent phases to air, water, or dilute HCl under ambient conditions. Scanning transmission electron microscopy and solid-state 7Li and 11B NMR spectroscopy, combined with X-ray pair distribution function (PDF) analysis and DFT calculations, were utilized to elucidate the novel structures of Li∼0.5NiB and the mechanism of Li-deintercalation. We have shown that the deintercalation of Li proceeds via a "zip-lock" mechanism, leading to the condensation of single [NiB] layers into double or triple layers bound via covalent bonds, resulting in structural fragments with Li[NiB]2 and Li[NiB]3 compositions. The crystal structure of Li∼0.5NiB is best described as an intergrowth of the ordered single [NiB], double [NiB]2, or triple [NiB]3 layers alternating with single Li layers; this explains its structural complexity. The formation of double or triple [NiB] layers induces a change in the magnetic behavior from temperature-independent paramagnets in the parent LiNiB compounds to the spin-glassiness in the deintercalated Li∼0.5NiB counterparts. LiNiB compounds showcase the potential to access a plethora of unique materials, including 2D MBenes (NiB).
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Affiliation(s)
- Gourab Bhaskar
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | | | - Maria Batuk
- EMAT, Department of Physics, University of Antwerp, Antwerp 2020, Belgium
| | | | - Yang Sun
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
| | - Renhai Wang
- Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States.,Department of Physics, University of Science and Technology of China, Hefei 230026, China
| | - Chao Zhang
- Department of Physics, Yantai University, Yantai 264005, China
| | - Scott L Carnahan
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States
| | - Xun Wu
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States
| | - Raquel A Ribeiro
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States
| | - Sergey L Bud'ko
- Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States.,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States
| | - Paul C Canfield
- Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States.,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States
| | - Wenyu Huang
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States
| | - Aaron J Rossini
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States
| | - Cai-Zhuang Wang
- Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, United States.,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States
| | - Kai-Ming Ho
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States
| | - Joke Hadermann
- EMAT, Department of Physics, University of Antwerp, Antwerp 2020, Belgium
| | - Julia V Zaikina
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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45
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Abstract
ConspectusSince the initial discovery of colloidal lead halide perovskite nanocrystals, there has been significant interest placed on these semiconductors because of their remarkable optoelectronic properties, including very high photoluminescence quantum yields, narrow size- and composition-tunable emission over a wide color gamut, defect tolerance, and suppressed blinking. These material attributes have made them attractive components for next-generation solar cells, light emitting diodes, low-threshold lasers, single photon emitters, and X-ray scintillators. While a great deal of research has gone into the various applications of colloidal lead halide perovskite nanocrystals, comparatively little work has focused on the fundamental surface chemistry of these materials. While the surface chemistry of colloidal semiconductor nanocrystals is generally affected by their particle morphology, surface stoichiometry, and organic ligands that contribute to the first coordination sphere of their surface atoms, these attributes are markedly different in lead halide perovskite nanocrystals because of their ionicity.In this Account, emerging work on the surface chemistry of lead halide perovskite nanocrystals is highlighted, with a particular focus placed on the most-studied composition of CsPbBr3. We begin with an in-depth exploration of the native surface chemistry of as-prepared, 0-D cuboidal CsPbBr3 nanocrystals, including an atomistic description of their surface termini, vacancies, and ionic bonding with ligands. We then proceed to discuss various post-synthetic surface treatments that have been developed to increase the photoluminescence quantum yields and stability of CsPbBr3 nanocrystals, including the use of tetraalkylammonium bromides, metal bromides, zwitterions, and phosphonic acids, and how these various ligands are known to bind to the nanocrystal surface. To underscore the effect of post-synthetic surface treatments on the application of these materials, we focus on lead halide perovskite nanocrystal-based light emitting diodes, and the positive effect of various surface treatments on external quantum efficiencies. We also discuss the current state-of-the-art in the surface chemistry of 1-D nanowires and 2-D nanoplatelets of CsPbBr3, which are more quantum confined than the corresponding cuboidal nanocrystals but also generally possess a higher defect density because of their increased surface area-to-volume ratios.
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Affiliation(s)
- Sara R. Smock
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Yunhua Chen
- U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Aaron J. Rossini
- U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Richard L. Brutchey
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
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Gvozdetskyi V, Sun Y, Zhao X, Bhaskar G, Carnahan SL, Harmer CP, Zhang F, Ribeiro RA, Canfield PC, Rossini AJ, Wang CZ, Ho KM, Zaikina JV. Lithium nickel borides: evolution of [NiB] layers driven by Li pressure. Inorg Chem Front 2021. [DOI: 10.1039/d0qi01150a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Insertion of additional Li atoms into the Li-monolayer in the structures of layered LiNiB polymorphs induces the deformation of [NiB] layers and alters their stacking, however, does not affect magnetic properties.
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Affiliation(s)
| | - Yang Sun
- Department of Applied Physics and Applied Mathematics
- Columbia University
- New York
- USA
| | - Xin Zhao
- Ames Laboratory
- US DOE
- Iowa State University
- Ames
- USA
| | | | | | - Colin P. Harmer
- Department of Chemistry
- Iowa State University
- Ames
- USA
- Ames Laboratory
| | - Feng Zhang
- Ames Laboratory
- US DOE
- Iowa State University
- Ames
- USA
| | | | | | - Aaron J. Rossini
- Department of Chemistry
- Iowa State University
- Ames
- USA
- Ames Laboratory
| | | | - Kai-Ming Ho
- Department of Physics and Astronomy
- Iowa State University
- Ames
- USA
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Abstract
Ball milling of polystyrene under ambient conditions in metal containing vials causes scission of macromolecules, resulting in partial dismantling to styrene. Reactions proceeds via intermediate carbon-based free radicals that are detectable by EPR.
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Affiliation(s)
| | - Ihor Z. Hlova
- Ames Laboratory US DOE
- 311 Iowa State University
- Ames
- USA
| | - Scott L. Carnahan
- Ames Laboratory US DOE
- 311 Iowa State University
- Ames
- USA
- Department of Chemistry
| | - Mastooreh Seyedi
- Department of Materials Science and Engineering
- Clemson University
- 161 Sirrine Hall
- 515 Calhoun Drive
- Clemson
| | | | - Aaron J. Rossini
- Ames Laboratory US DOE
- 311 Iowa State University
- Ames
- USA
- Department of Chemistry
| | - Igor Luzinov
- Department of Materials Science and Engineering
- Clemson University
- 161 Sirrine Hall
- 515 Calhoun Drive
- Clemson
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48
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Balema VP, Hlova IZ, Carnahan SL, Seyedi M, Dolotko O, Rossini AJ, Luzinov I. Correction: Depolymerization of polystyrene under ambient conditions. NEW J CHEM 2021. [DOI: 10.1039/d1nj90029c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Correction for ‘Depolymerization of polystyrene under ambient conditions’ by Viktor P. Balema et al., New J. Chem., 2021, 45, 2935–2938, DOI: 10.1039/D0NJ05984F.
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Affiliation(s)
| | - Ihor Z. Hlova
- Ames Laboratory US DOE
- 311 Iowa State University
- Ames
- USA
| | - Scott L. Carnahan
- Ames Laboratory US DOE
- 311 Iowa State University
- Ames
- USA
- Department of Chemistry
| | - Mastooreh Seyedi
- Department of Materials Science and Engineering
- Clemson University
- Clemson
- USA
| | | | - Aaron J. Rossini
- Ames Laboratory US DOE
- 311 Iowa State University
- Ames
- USA
- Department of Chemistry
| | - Igor Luzinov
- Department of Materials Science and Engineering
- Clemson University
- Clemson
- USA
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49
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Dorn RW, Cendejas MC, Chen K, Hung I, Altvater NR, McDermott WP, Gan Z, Hermans I, Rossini AJ. Structure Determination of Boron-Based Oxidative Dehydrogenation Heterogeneous Catalysts with Ultra-High Field 35.2 T 11B Solid-State NMR Spectroscopy. ACS Catal 2020; 10:13852-13866. [PMID: 34413990 DOI: 10.1021/acscatal.0c03762] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Boron-based heterogenous catalysts, such as hexagonal boron nitride (h-BN) as well as supported boron oxides, are highly selective catalysts for the oxidative dehydrogenation (ODH) of light alkanes to olefins. Previous catalytic measurements and molecular characterization of boron-based catalysts by 11B solid-state NMR spectroscopy and other techniques suggests that oxidized/hydrolyzed boron clusters are the catalytically active sites for ODH. However, 11B solid-state NMR spectroscopy often suffers from limited resolution because boron-11 is an I = 3/2 half-integer quadrupolar nucleus. Here, ultra-high magnetic field (B 0 = 35.2 T) is used to enhance the resolution of 11B solid-state NMR spectra and unambiguously determine the local structure and connectivity of boron species in h-BN nanotubes used as a ODH catalyst (spent h-BNNT), boron substituted MCM-22 zeolite [B-MWW] and silica supported boron oxide [B/SiO2] before and after use as an ODH catalyst. One-dimensional direct excitation 11B NMR spectra recorded at B 0 = 35.2 T are near isotropic in nature, allowing for the easy identification of all boron species. Two-dimensional 1H-11B heteronuclear correlation NMR spectra aid in the identification of boron species with B-OH functionality. Most importantly, 2D 11B dipolar double-quantum single-quantum homonuclear correlation NMR experiments were used to unambiguously probe boron-boron connectivity within all heterogeneous catalysts. These experiments are practically infeasible at lower, more conventional magnetic fields due to a lack of resolution and reduced NMR sensitivity. The detailed molecular structures determined for the amorphous oxidized/hydrolyzed boron layers on these heterogenous catalysts will aid in the future development of next generation ODH catalysts.
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Affiliation(s)
- Rick W. Dorn
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- Ames Laboratory, US Department of Energy, Ames, Iowa 50011, United States
| | - Melissa C. Cendejas
- Department of Chemistry, University of Wisconsin − Madison, Madison, Wisconsin 53706, United States
| | - Kuizhi Chen
- National High Magnetic Field Laboratory (NHMFL), Tallahassee, Florida 32310, United States
| | - Ivan Hung
- National High Magnetic Field Laboratory (NHMFL), Tallahassee, Florida 32310, United States
| | - Natalie R. Altvater
- Department of Chemical and Biological Engineering, University of Wisconsin − Madison, Madison, Wisconsin 53706, United States
| | - William P. McDermott
- Department of Chemistry, University of Wisconsin − Madison, Madison, Wisconsin 53706, United States
| | - Zhehong Gan
- National High Magnetic Field Laboratory (NHMFL), Tallahassee, Florida 32310, United States
| | - Ive Hermans
- Department of Chemistry, University of Wisconsin − Madison, Madison, Wisconsin 53706, United States
- Department of Chemical and Biological Engineering, University of Wisconsin − Madison, Madison, Wisconsin 53706, United States
| | - Aaron J. Rossini
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- Ames Laboratory, US Department of Energy, Ames, Iowa 50011, United States
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50
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Dolotko O, Hlova IZ, Pathak AK, Mudryk Y, Pecharsky VK, Singh P, Johnson DD, Boote BW, Li J, Smith EA, Carnahan SL, Rossini AJ, Zhou L, Eastman EM, Balema VP. Unprecedented generation of 3D heterostructures by mechanochemical disassembly and re-ordering of incommensurate metal chalcogenides. Nat Commun 2020; 11:3005. [PMID: 32532971 PMCID: PMC7293273 DOI: 10.1038/s41467-020-16672-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 05/15/2020] [Indexed: 11/09/2022] Open
Abstract
Three-dimensional heterostructures are usually created either by assembling two-dimensional building blocks into hierarchical architectures or using stepwise chemical processes that sequentially deposit individual monolayers. Both approaches suffer from a number of issues, including lack of suitable precursors, limited reproducibility, and poor scalability of the preparation protocols. Therefore, development of alternative methods that enable preparation of heterostructured materials is desired. We create heterostructures with incommensurate arrangements of well-defined building blocks using a synthetic approach that comprises mechanical disassembly and simultaneous reordering of layered transition-metal dichalcogenides, MX2, and non-layered monochalcogenides, REX, where M = Ta, Nb, RE = Sm, La, and X = S, Se. We show that the discovered solid-state processes are rooted in stochastic mechanochemical transformations directed by electronic interaction between chemically and structurally dissimilar solids toward atomic-scale ordering, and offer an alternative to conventional heterostructuring. Details of composition–structure–properties relationships in the studied materials are also highlighted. 3D heterostructures offer properties that are inaccessible in bulk single-phase solids, but synthetic approaches are limited. The authors use mechanochemical reshuffling of binary precursors and subsequent annealing to design structurally aligned misfit heterostructures with well-defined atomic arrangements.
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