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Valenzuela Reina J, Civaia F, Harper AF, Scheurer C, Köcher SS. The EFG Rosetta Stone: translating between DFT calculations and solid state NMR experiments. Faraday Discuss 2024. [PMID: 39291349 DOI: 10.1039/d4fd00075g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/19/2024]
Abstract
We present a comprehensive study on the best practices for integrating first principles simulations in experimental quadrupolar solid-state nuclear magnetic resonance (SS-NMR), exploiting the synergies between theory and experiment for achieving the optimal interpretation of both. Most high performance materials (HPMs), such as battery electrodes, exhibit complex SS-NMR spectra due to dynamic effects or amorphous phases. NMR crystallography for such challenging materials requires reliable, accurate, efficient computational methods for calculating NMR observables from first principles for the transfer between theoretical material structure models and the interpretation of their experimental SS-NMR spectra. NMR-active nuclei within HPMs are routinely probed by their chemical shielding anisotropy (CSA). However, several nuclear isotopes of interest, e.g.7Li and 27Al, have a nuclear quadrupole and experience additional interactions with the surrounding electric field gradient (EFG). The quadrupolar interaction is a valuable source of information about atomistic structure, and in particular, local symmetry, complementing the CSA. As such, there is a range of different methods and codes to choose from for calculating EFGs, from all-electron to plane wave methods. We benchmark the accuracy of different simulation strategies for computing the EFG tensor of quadrupolar nuclei with plane wave density functional theory (DFT) and study the impact of the material structure as well as the details of the simulation strategy. Especially for small nuclei with few electrons, such as 7Li, we show that the choice of physical approximations and simulation parameters has a large effect on the transferability of the simulation results. To the best of our knowledge, we present the first comprehensive reference scale and literature survey for 7Li quadrupolar couplings. The results allow us to establish practical guidelines for developing the best simulation strategy for correlating DFT to experimental data extracting the maximum benefit and information from both, thereby advancing further research into HPMs.
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Affiliation(s)
| | - Federico Civaia
- Fritz-Haber Institute of the Max Planck Society, Berlin, Germany
| | - Angela F Harper
- Fritz-Haber Institute of the Max Planck Society, Berlin, Germany
| | | | - Simone S Köcher
- Fritz-Haber Institute of the Max Planck Society, Berlin, Germany
- Institut für Energie und Klimaforschung (IEK-9), Forschungszentrum Jülich GmbH, Jülich, Germany.
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Harper AF, Huss T, Köcher SS, Scheurer C. Tracking Li atoms in real-time with ultra-fast NMR simulations. Faraday Discuss 2024. [PMID: 39290191 DOI: 10.1039/d4fd00074a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/19/2024]
Abstract
We present for the first time a multiscale machine learning approach to jointly simulate atomic structure and dynamics with the corresponding solid state Nuclear Magnetic Resonance (ssNMR) observables. We study the use-case of spin-alignment echo (SAE) NMR for exploring Li-ion diffusion within the solid state electrolyte material Li3PS4 (LPS) by calculating quadrupolar frequencies of 7Li. SAE NMR probes long-range dynamics down to microsecond-timescale hopping processes. Therefore only a few machine learning force field schemes are able to capture the time- and length scales required for accurate comparison with experimental results. By using a new class of machine learning interatomic potentials, known as ultra-fast potentials (UFPs), we are able to efficiently access timescales beyond the microsecond regime. In tandem, we have developed a machine learning model for predicting the full 7Li electric field gradient (EFG) tensors in LPS. By combining the long timescale trajectories from the UFP with our model for 7Li EFG tensors, we are able to extract the autocorrelation function (ACF) for 7Li quadrupolar frequencies during Li diffusion. We extract the decay constants from the ACF for both crystalline β-LPS and amorphous LPS, and find that the predicted Li hopping rates are on the same order of magnitude as those predicted from the Li dynamics. This demonstrates the potential for machine learning to finally make predictions on experimentally relevant timescales and temperatures, and opens a new avenue of NMR crystallography: using machine learning dynamical NMR simulations for accessing polycrystalline and glass ceramic materials.
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Affiliation(s)
- Angela F Harper
- Fritz-Haber Institute of the Max Planck Society, Berlin, Germany.
| | - Tabea Huss
- Fritz-Haber Institute of the Max Planck Society, Berlin, Germany.
| | - Simone S Köcher
- Fritz-Haber Institute of the Max Planck Society, Berlin, Germany.
- Institut für Energie und Klimaforschung (IEK-9), Forschungszentrum Jülich GmbH, Jülich, Germany
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3
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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] [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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4
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Zibrowius B, Fischer M. On the Use of Solomon Echoes in 27 Al NMR Studies of Complex Aluminium Hydrides. ChemistryOpen 2024; 13:e202300011. [PMID: 37316892 PMCID: PMC10784626 DOI: 10.1002/open.202300011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 05/12/2023] [Indexed: 06/16/2023] Open
Abstract
The quadrupole coupling constant CQ and the asymmetry parameter η have been determined for two complex aluminium hydrides from 27 Al NMR spectra recorded for stationary samples by using the Solomon echo sequence. The thus obtained data for KAlH4 (CQ =(1.30±0.02) MHz, η=(0.64±0.02)) and NaAlH4 (CQ =(3.11±0.02) MHz, η<0.01) agree very well with data previously determined from MAS NMR spectra. The accuracy with which these parameters can be determined from static spectra turned out to be at least as good as via the MAS approach. The experimentally determined parameters (δiso , CQ and η) are compared with those obtained from DFT-GIPAW (density functional theory - gauge-including projected augmented wave) calculations. Except for the quadrupole coupling constant for KAlH4 , which is overestimated in the GIPAW calculations by about 30 %, the agreement is excellent. Advantages of the application of the Solomon echo sequence for the measurement of less stable materials or for in situ studies are discussed.
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Affiliation(s)
| | - Michael Fischer
- Crystallography & Geomaterials Research, Faculty of GeosciencesUniversity of BremenKlagenfurter Straße 2–428359BremenGermany
- Bremen Center for Computational Materials ScienceUniversity of Bremen28359BremenGermany
- MAPEX Center for Materials and ProcessesUniversity of Bremen28359BremenGermany
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5
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Zhang W, Hassan A, Struppe J, Monette M, Hung I, Gan Z, Martins V, Terskikh V, Huang Y. Overcoming challenges in 67Zn NMR: a new strategy of signal enhancement for MOF characterization. Chem Commun (Camb) 2023; 59:5205-5208. [PMID: 37042636 PMCID: PMC10155100 DOI: 10.1039/d3cc00716b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
Abstract
67 Zn solid-state NMR suffers from low sensitivity, limiting its ability to probe the Zn2+ surroundings in MOFs. We report a breakthrough in overcoming challenges in 67Zn NMR. Combining new cryogenic MAS probe technology and performing NMR experiments at a high magnetic field results in remarkable signal enhancement, yielding enhanced information for MOF characterization.
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Affiliation(s)
- Wanli Zhang
- Department of Chemistry, University of Western Ontario, London, Ontario, N6A 5B7, Canada.
| | - Alia Hassan
- Bruker Switzerland AG, Fällanden, Switzerland
| | - Jochem Struppe
- Bruker Biospin Corporation, 15 Fortune Drive, Billerica, MA 01821, USA
| | - Martine Monette
- Bruker Biospin Ltd., 2800 High Point Drive, Suite 206, Milton, Ontario L9T 6P4, Canada
| | - Ivan Hung
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
| | - Zhehong Gan
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
| | - Vinicius Martins
- Department of Chemistry, University of Western Ontario, London, Ontario, N6A 5B7, Canada.
| | - Victor Terskikh
- Metrology, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
| | - Yining Huang
- Department of Chemistry, University of Western Ontario, London, Ontario, N6A 5B7, Canada.
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Yasui Y, Tansho M, Fujii K, Sakuda Y, Goto A, Ohki S, Mogami Y, Iijima T, Kobayashi S, Kawaguchi S, Osaka K, Ikeda K, Otomo T, Yashima M. Hidden chemical order in disordered Ba 7Nb 4MoO 20 revealed by resonant X-ray diffraction and solid-state NMR. Nat Commun 2023; 14:2337. [PMID: 37095089 PMCID: PMC10126145 DOI: 10.1038/s41467-023-37802-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Accepted: 03/30/2023] [Indexed: 04/26/2023] Open
Abstract
The chemical order and disorder of solids have a decisive influence on the material properties. There are numerous materials exhibiting chemical order/disorder of atoms with similar X-ray atomic scattering factors and similar neutron scattering lengths. It is difficult to investigate such order/disorder hidden in the data obtained from conventional diffraction methods. Herein, we quantitatively determined the Mo/Nb order in the high ion conductor Ba7Nb4MoO20 by a technique combining resonant X-ray diffraction, solid-state nuclear magnetic resonance (NMR) and first-principle calculations. NMR provided direct evidence that Mo atoms occupy only the M2 site near the intrinsically oxygen-deficient ion-conducting layer. Resonant X-ray diffraction determined the occupancy factors of Mo atoms at the M2 and other sites to be 0.50 and 0.00, respectively. These findings provide a basis for the development of ion conductors. This combined technique would open a new avenue for in-depth investigation of the hidden chemical order/disorder in materials.
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Affiliation(s)
- Yuta Yasui
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Masataka Tansho
- NMR Station, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
| | - Kotaro Fujii
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Yuichi Sakuda
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Atsushi Goto
- NMR Station, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
| | - Shinobu Ohki
- NMR Station, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
| | - Yuuki Mogami
- NMR Station, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
| | - Takahiro Iijima
- Institute of Arts and Sciences, Yamagata University, 1-4-12 Kojirakawa-machi, Yamagata, Yamagata, 990-8560, Japan
| | - Shintaro Kobayashi
- Diffraction and Scattering Division, Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
| | - Shogo Kawaguchi
- Diffraction and Scattering Division, Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
| | - Keiichi Osaka
- Industrial Application and Partnership Division, Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
| | - Kazutaka Ikeda
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
- J-PARC Center, High Energy Accelerator Research Organization (KEK), 2-4 Shirakata-Shirane, Tokai, Ibaraki, 319-1106, Japan
- School of High Energy Accelerator Science, The Graduate University for Advanced Studies, 203-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
| | - Toshiya Otomo
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
- J-PARC Center, High Energy Accelerator Research Organization (KEK), 2-4 Shirakata-Shirane, Tokai, Ibaraki, 319-1106, Japan
- School of High Energy Accelerator Science, The Graduate University for Advanced Studies, 203-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
- Graduate School of Science and Engineering, Ibaraki University, 162-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
| | - Masatomo Yashima
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan.
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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. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 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] [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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8
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Ward JS, Sievänen EI, Rissanen K. Solid-state NMR Spectroscopy of Iodine(I) Complexes. Chem Asian J 2023; 18:e202201203. [PMID: 36734201 DOI: 10.1002/asia.202201203] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 01/26/2023] [Accepted: 01/27/2023] [Indexed: 02/04/2023]
Abstract
Solid-state NMR has been applied to a series of Barluenga-type iodine(I) [L-I-L]PF6 (L=pyridine, 4-ethylpyridine, 4-dimethylaminopyridine, isoquinoline) complexes as their hexafluorophosphate salts, as well as their respective non-liquid ligands (L), their precursor silver(I) complexes, and the respective N-methylated pyridinium and quinolinium hexafluorophoshate salts. These results are compared and contrasted to the corresponding solution studies and single-crystal X-ray structures. As the first study of its kind on the solid-state NMR behavior of halogen(I) complexes, practical considerations are also discussed to encourage wider utilization of this technique in the future.
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Affiliation(s)
- Jas S Ward
- University of Jyvaskyla, Department of Chemistry, Jyväskylä, 40014, Finland
| | - Elina I Sievänen
- University of Jyvaskyla, Department of Chemistry, Jyväskylä, 40014, Finland
| | - Kari Rissanen
- University of Jyvaskyla, Department of Chemistry, Jyväskylä, 40014, Finland
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9
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Gómez JS, Trébosc J, Tuan Duong N, Pourpoint F, Lafon O, Amoureux JP. Comparison of through-space homonuclear correlations between quadrupolar nuclei in solids. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2023; 348:107388. [PMID: 36841183 DOI: 10.1016/j.jmr.2023.107388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 01/23/2023] [Accepted: 01/24/2023] [Indexed: 06/18/2023]
Abstract
Various two-dimensional (2D) homonuclear correlation experiments have been proposed to observe proximities between identical half-integer spin quadrupolar nuclei in solids. These experiments select either the single- or double-quantum coherences during the indirect evolution period, t1. We compare here the efficiency and the robustness of the 2D double-quantum to single-quantum (DQ-SQ) and SQ-SQ homonuclear correlations for two half-integer spin quadrupolar isotopes subject to small chemical shift anisotropy (CSA): 11B with a nuclear spin I = 3/2 and 27Al with I = 5/2. Such a comparison is performed using experiments on two model samples: Li2B4O7 for 11B and AlPO4-14 for 27Al. For both isotopes, the DQ-SQ homonuclear correlations are recommended since they allow probing the proximities between nuclei with close or identical frequencies. In the case of small or moderate isotropic chemical shift differences (e.g. 11B) the [SR221] or [BR221] bracketed DQ-SQ recoupling schemes are recommended; whereas it is the BR221 un-bracketed one otherwise (e.g. 27Al).
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Affiliation(s)
- Jennifer S Gómez
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, Lille 59000, France
| | - Julien Trébosc
- Univ. Lille, CNRS, INRAE, Centrale Lille, Univ. Artois, FR 2638 - IMEC - Fédération Chevreul, Lille 59000, France
| | - Nghia Tuan Duong
- Nano-Crystallography Unit, RIKEN-JEOL Collaboration Center, Yokohama, Kanagawa 230-0045, Japan
| | - Frédérique Pourpoint
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, Lille 59000, France
| | - Olivier Lafon
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, Lille 59000, France.
| | - Jean-Paul Amoureux
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, Lille 59000, France; Bruker Biospin, 34 rue de l'industrie, Wissembourg 67166, France.
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10
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McKay RT. Metabolomics and NMR. Handb Exp Pharmacol 2023; 277:73-116. [PMID: 36355220 DOI: 10.1007/164_2022_616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The purpose of this manuscript will be to convince the reader to dive deeper into NMR spectroscopy and prevent the technique from being just another "black-box" in the lab. We will try to concisely highlight interesting topics and supply additional references for further exploration at each stage. The advantages of delving into the technique will be shown. The secondary objective, i.e., avoiding common problems before starting, will hopefully then become clear. Lastly, we will emphasize the spectrometer information needed for manuscript reporting to allow reproduction of results and confirm findings.
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Affiliation(s)
- Ryan T McKay
- Department Chemistry, College of Natural and Applied Sciences, University of Alberta, Edmonton, AB, Canada.
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11
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Berge AH, Pugh SM, Short MIM, Kaur C, Lu Z, Lee JH, Pickard CJ, Sayari A, Forse AC. Revealing carbon capture chemistry with 17-oxygen NMR spectroscopy. Nat Commun 2022; 13:7763. [PMID: 36522319 PMCID: PMC9755136 DOI: 10.1038/s41467-022-35254-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 11/21/2022] [Indexed: 12/23/2022] Open
Abstract
Carbon dioxide capture is essential to achieve net-zero emissions. A hurdle to the design of improved capture materials is the lack of adequate tools to characterise how CO2 adsorbs. Solid-state nuclear magnetic resonance (NMR) spectroscopy is a promising probe of CO2 capture, but it remains challenging to distinguish different adsorption products. Here we perform a comprehensive computational investigation of 22 amine-functionalised metal-organic frameworks and discover that 17O NMR is a powerful probe of CO2 capture chemistry that provides excellent differentiation of ammonium carbamate and carbamic acid species. The computational findings are supported by 17O NMR experiments on a series of CO2-loaded frameworks that clearly identify ammonium carbamate chain formation and provide evidence for a mixed carbamic acid - ammonium carbamate adsorption mode. We further find that carbamic acid formation is more prevalent in this materials class than previously believed. Finally, we show that our methods are readily applicable to other adsorbents, and find support for ammonium carbamate formation in amine-grafted silicas. Our work paves the way for investigations of carbon capture chemistry that can enable materials design.
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Affiliation(s)
- Astrid H Berge
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Suzi M Pugh
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Marion I M Short
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Chanjot Kaur
- Centre for Catalysis Research and Innovation (CCRI), Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Ziheng Lu
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, UK
| | - Jung-Hoon Lee
- Computational Science Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Chris J Pickard
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, UK
- Advanced Institute for Materials Research, Tohoku University, Aoba, Sendai, 980-8577, Japan
| | - Abdelhamid Sayari
- Centre for Catalysis Research and Innovation (CCRI), Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Alexander C Forse
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
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12
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Bayzou R, Trébosc J, Hung I, Gan Z, Rankin A, Lafon O, Amoureux JP. Improved resolution for spin-3/2 isotopes in solids via the indirect NMR detection of triple-quantum coherences using the T-HMQC sequence. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2022; 122:101835. [PMID: 36308816 DOI: 10.1016/j.ssnmr.2022.101835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 10/10/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
The indirect NMR detection of quadrupolar nuclei in solids under magic-angle spinning (MAS) is possible with the through-space HMQC (heteronuclear multiple-quantum coherence) scheme incorporating the TRAPDOR (transfer of population in double-resonance) dipolar recoupling. This sequence, called T-HMQC, exhibits limited t1-noise. In this contribution, with the help of numerical simulations of spin dynamics, we show that most of the time, the fastest coherence transfer in the T-HMQC scheme is achieved when TRAPDOR recoupling employs the highest radiofrequency (rf) field compatible with the probe specifications. We also demonstrate how the indirect detection of the triple-quantum (3Q) coherences of spin-3/2 quadrupolar nuclei in solids improves the spectral resolution for these isotopes. The sequence is then called T-HMQC3. We demonstrate the gain in resolution provided by this sequence for the indirect proton detection of 35Cl nuclei in l-histidine∙HCl and l-cysteine∙HCl, as well as that of 23Na isotope in NaH2PO4. These experiments indicate that the gain in resolution depends on the relative values of the chemical and quadrupolar-induced shifts (QIS) for the different spin-3/2 species. In the case of NaH2PO4, we show that the transfer efficiency of the T-HMQC3 sequence employing an rf-field of 80 kHz with a MAS frequency of 62.5 kHz reaches 75% of that of the t1-noise eliminated (TONE) dipolar-mediated HMQC (D-HMQC) scheme.
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Affiliation(s)
- Racha Bayzou
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie, du Solide, 59000, Lille, France
| | - Julien Trébosc
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie, du Solide, 59000, Lille, France; Univ. Lille, CNRS, INRAE, Centrale Lille, Univ. Artois, FR 2638 - IMEC - Fédération Chevreul, 59000, Lille, France
| | - Ivan Hung
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL, 32310, USA
| | - Zhehong Gan
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL, 32310, USA
| | - Andrew Rankin
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie, du Solide, 59000, Lille, France; Univ. Lille, CNRS, INRAE, Centrale Lille, Univ. Artois, FR 2638 - IMEC - Fédération Chevreul, 59000, Lille, France
| | - Olivier Lafon
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie, du Solide, 59000, Lille, France
| | - Jean-Paul Amoureux
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie, du Solide, 59000, Lille, France; Bruker Biospin, 34 rue de l'industrie, 67166, Wissembourg, France.
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13
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Bayzou R, Trébosc J, Hung I, Gan Z, Lafon O, Amoureux JP. Indirect NMR detection via proton of nuclei subject to large anisotropic interactions, such as 14N, 195Pt, and 35Cl, using the T-HMQC sequence. J Chem Phys 2022; 156:064202. [DOI: 10.1063/5.0082700] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Affiliation(s)
- Racha Bayzou
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181–UCCS–Unité de Catalyse et Chimie du Solide, 59000 Lille, France
| | - Julien Trébosc
- Univ. Lille, CNRS, INRAE, Centrale Lille, Univ. Artois, FR 2638–IMEC–Fédération Chevreul, 59000 Lille, France
| | - Ivan Hung
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
| | - Zhehong Gan
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
| | - Olivier Lafon
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181–UCCS–Unité de Catalyse et Chimie du Solide, 59000 Lille, France
| | - Jean-Paul Amoureux
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181–UCCS–Unité de Catalyse et Chimie du Solide, 59000 Lille, France
- Riken NMR Science and Development Division, Yokohama-shi 230-0045, Kanagawa, Japan
- Bruker Biospin, 34 rue de l’industrie, 67166 Wissembourg, France
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14
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Zeman OEO, Bräuniger T. Quantifying the quadrupolar interaction by 45Sc-NMR spectroscopy of single crystals. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2022; 117:101775. [PMID: 35074591 DOI: 10.1016/j.ssnmr.2022.101775] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 01/10/2022] [Accepted: 01/10/2022] [Indexed: 06/14/2023]
Abstract
Single crystals of the compound [ [Formula: see text] ]Cl4 ⋅ 2H2O were studied by 45Sc-NMR, with the effect of the quadrupolar coupling interaction on the spectra of the spin-7/2 nucleus analysed in the hierarchical framework of perturbation theory. Orientation-dependent spectra acquired at B0 = 17.6 T showed strong second-order effects due to the comparatively large coupling constant of χ = |14.613 ± 0.006| MHz, with an associated asymmetry parameter of ηQ = 0.540 9 ± 0.000 4. By analysing the splittings of the ±3/2 satellites, which in good approximation are subjected to first-order effects only, the full quadrupolar coupling tensor could be determined. The second-order effects caused by this tensor were calculated according to theoretical predictions for all orientations, and subtracted from both the centres of gravity of the satellites, and the central transitions. This allowed extraction of the full chemical shift tensor, with the eigenvalues being δ11 = (5.6 ± 0.9) ppm, δ22 = (12.4 ± 0.9) ppm, and δ33 = (38.5 ± 0.9) ppm. In spectra acquired at a lower magnetic field of B0 = 9.4 T, third-order effects could be detected, and similarly quantified using analytical expressions.
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Affiliation(s)
- Otto E O Zeman
- Department of Chemistry, University of Munich (LMU), Butenandtstr. 5-13, 81 377, Munich, Germany
| | - Thomas Bräuniger
- Department of Chemistry, University of Munich (LMU), Butenandtstr. 5-13, 81 377, Munich, Germany.
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15
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Huynh W, Taylor JW, Harman WH, Conley MP. Solid-state 11B NMR studies of coinage metal complexes containing a phosphine substituted diboraanthracene ligand. Dalton Trans 2021; 50:14855-14863. [PMID: 34604875 DOI: 10.1039/d1dt02981a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Transition metal interactions with Lewis acids (M → Z linkages) are fundamentally interesting and practically important. The most common Z-type ligands contain boron, which contains an NMR active 11B nucleus. We measured solid-state 11B{1H} NMR spectra of copper, silver, and gold complexes containing a phosphine substituted 9,10-diboraanthracene ligand (B2P2) that contain planar boron centers and weak M → BR3 linkages ([(B2P2)M][BArF4] (M = Cu (1), Ag (2), Au (3)) characterized by large quadrupolar coupling (CQ) values (4.4-4.7 MHz) and large span (Ω) values (93-139 ppm). However, the solid-state 11B{1H} NMR spectrum of K[Au(B2P2)]- (4), which contains tetrahedral borons, is narrow and characterized by small CQ and Ω values. DFT analysis of 1-4 shows that CQ and Ω are expected to be large for planar boron environments and small for tetrahedral boron, and that the presence of a M → BR3 linkage relates to the reduction in CQ and 11B NMR shielding properties. Thus solid-state 11B NMR spectroscopy contains valuable information about M → BR3 linkages in complexes containing the B2P2 ligand.
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Affiliation(s)
- Winn Huynh
- Department of Chemistry, University of California, Riverside, California 92521, USA.
| | - Jordan W Taylor
- Department of Chemistry, University of California, Riverside, California 92521, USA.
| | - W Hill Harman
- Department of Chemistry, University of California, Riverside, California 92521, USA.
| | - Matthew P Conley
- Department of Chemistry, University of California, Riverside, California 92521, USA.
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16
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Hartman JD, Mathews A, Harper JK. Fast and Accurate Electric Field Gradient Calculations in Molecular Solids With Density Functional Theory. Front Chem 2021; 9:751711. [PMID: 34692646 PMCID: PMC8529703 DOI: 10.3389/fchem.2021.751711] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Accepted: 09/20/2021] [Indexed: 11/24/2022] Open
Abstract
Modern approaches for calculating electric field gradient (EFF) tensors in molecular solids rely upon plane-wave calculations employing periodic boundary conditions (PBC). In practice, models employing PBCs are limited to generalized gradient approximation (GGA) density functionals. Hybrid density functionals applied in the context of gauge-including atomic orbital (GIAO) calculations have been shown to substantially improve the accuracy of predicted NMR parameters. Here we propose an efficient method that effectively combines the benefits of both periodic calculations and single-molecule techniques for predicting electric field gradient tensors in molecular solids. Periodic calculations using plane-wave basis sets were used to model the crystalline environment. We then introduce a molecular correction to the periodic result obtained from a single-molecule calculation performed with a hybrid density functional. Single-molecule calculations performed using hybrid density functionals were found to significantly improve the agreement of predicted 17O quadrupolar coupling constants (C q ) with experiment. We demonstrate a 31% reduction in the RMS error for the predicted 17O C q values relative to standard plane-wave methods using a carefully constructed test set comprised of 22 oxygen-containing molecular crystals. We show comparable improvements in accuracy using five different hybrid density functionals and find predicted C q values to be relatively insensitive to the choice of basis set used in the single molecule calculation. Finally, the utility of high-accuracy 17O C q predictions is demonstrated by examining the disordered 4-Nitrobenzaldehyde crystal structure.
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Affiliation(s)
- Joshua D. Hartman
- Department of Chemistry, Mt. San Jacinto College, Menifee, CA, United States
| | - Amanda Mathews
- Department of Chemistry, Mt. San Jacinto College, Menifee, CA, United States
| | - James K. Harper
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, United States
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17
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Nagashima H, Trébosc J, Kon Y, Lafon O, Amoureux JP. Efficient transfer of DNP-enhanced 1 H magnetization to half-integer quadrupolar nuclei in solids at moderate spinning rate. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2021; 59:920-939. [PMID: 33300128 DOI: 10.1002/mrc.5121] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 12/02/2020] [Accepted: 12/05/2020] [Indexed: 06/12/2023]
Abstract
We show herein how the proton magnetization enhanced by dynamic nuclear polarization (DNP) can be efficiently transferred at moderate magic-angle spinning (MAS) frequencies to half-integer quadrupolar nuclei, S ≥ 3/2, using the Dipolar-mediated Refocused Insensitive Nuclei Enhanced by Polarization Transfer (D-RINEPT) technique, in which a symmetry-based SR 4 1 2 recoupling scheme built from adiabatic inversion 1 H pulses reintroduces the 1 H-S dipolar couplings, while suppressing the 1 H-1 H ones. The use of adiabatic pulses also improves the robustness to offsets and radiofrequency (rf)-field inhomogeneity. Furthermore, the efficiency of the polarization transfer is further improved by using 1 H composite pulses and continuous-wave irradiations between the recoupling blocks, as well as by manipulating the S satellite transitions during the first recoupling block. Furthermore, in the case of large 1 H-S dipolar couplings, the D-RINEPT variant with two pulses on the quadrupolar channel results in an improved transfer efficiency. We compare here the performances of this new adiabatic scheme with those of its parent version with single π pulses, as well as with those of PRESTO and CPMAS transfers. This comparison is performed using simulations as well as DNP-enhanced 27 Al, 95 Mo, and 17 O NMR experiments on isotopically unmodified γ-alumina, hydrated titania-supported MoO3 , Mg(OH)2 , and l-histidine·HCl·H2 O. The introduced RINEPT method outperforms the existing methods, both in terms of efficiency and robustness to rf-field inhomogeneity and offset.
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Affiliation(s)
- Hiroki Nagashima
- Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Julien Trébosc
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et de Chimie du Solide, Lille, France
- Univ. Lille, CNRS, INRAE, Centrale Lille, Univ. Artois, FR 2638 - IMEC - Institut Michel-Eugène Chevreul, Lille, France
| | - Yoshihiro Kon
- Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Olivier Lafon
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et de Chimie du Solide, Lille, France
- Institut Universitaire de France, France
| | - Jean-Paul Amoureux
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et de Chimie du Solide, Lille, France
- Bruker BioSpin, Wissembourg, France
- NMR Science and Development Division, Riken, Yokohama, Japan
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18
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Smith ME. Recent progress in solid-state nuclear magnetic resonance of half-integer spin low-γ quadrupolar nuclei applied to inorganic materials. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2021; 59:864-907. [PMID: 33207003 DOI: 10.1002/mrc.5116] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 11/12/2020] [Accepted: 11/13/2020] [Indexed: 06/11/2023]
Abstract
An overview is presented of recent progress in the solid-state nuclear magnetic resonance (NMR) observation of low-γ nuclei, with a focus on applications to inorganic materials. The technological and methodological advances in the last 20 years, which have underpinned the increased accessibility of low-γ nuclei for study by solid-state NMR techniques, are summarised, including improvements in hardware, pulse sequences and associated computational methods (e.g., first principles calculations and spectral simulation). Some of the key initial observations from inorganic materials of these nuclei are highlighted along with some recent (most within the last 10 years) illustrations of their application to such materials. A summary of other recent reviews of the study of low-γ nuclei by solid-state NMR is provided so that a comprehensive understanding of what has been achieved to date is available.
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Affiliation(s)
- Mark E Smith
- Vice-Chancellor and President's Office and Department of Chemistry, University of Southampton, Southampton, UK
- Department of Chemistry, Lancaster University, Bailrigg, Lancaster, UK
- Department of Physics, University of Warwick, Coventry, UK
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19
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Gómez J, Rankin A, Trébosc J, Pourpoint F, Tsutsumi Y, Nagashima H, Lafon O, Amoureux JP. Improved NMR transfer of magnetization from protons to half-integer spin quadrupolar nuclei at moderate and high magic-angle spinning frequencies. MAGNETIC RESONANCE (GOTTINGEN, GERMANY) 2021; 2:447-464. [PMID: 37904781 PMCID: PMC10539806 DOI: 10.5194/mr-2-447-2021] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 06/01/2021] [Indexed: 11/01/2023]
Abstract
Half-integer spin quadrupolar nuclei are the only magnetic isotopes for the majority of the chemical elements. Therefore, the transfer of polarization from protons to these isotopes under magic-angle spinning (MAS) can provide precious insights into the interatomic proximities in hydrogen-containing solids, including organic, hybrid, nanostructured and biological solids. This transfer has recently been combined with dynamic nuclear polarization (DNP) in order to enhance the NMR signal of half-integer quadrupolar isotopes. However, the cross-polarization transfer lacks robustness in the case of quadrupolar nuclei, and we have recently introduced as an alternative technique a D -RINEPT (through-space refocused insensitive nuclei enhancement by polarization transfer) scheme combining a heteronuclear dipolar recoupling built from adiabatic pulses and a continuous-wave decoupling. This technique has been demonstrated at 9.4 T with moderate MAS frequencies, ν R ≈ 10 -15 kHz, in order to transfer the DNP-enhanced 1 H polarization to quadrupolar nuclei. Nevertheless, polarization transfers from protons to quadrupolar nuclei are also required at higher MAS frequencies in order to improve the 1 H resolution. We investigate here how this transfer can be achieved at ν R ≈ 20 and 60 kHz. We demonstrate that the D -RINEPT sequence using adiabatic pulses still produces efficient and robust transfers but requires large radio-frequency (rf) fields, which may not be compatible with the specifications of most MAS probes. As an alternative, we introduce robust and efficient variants of the D -RINEPT and PRESTO (phase-shifted recoupling effects a smooth transfer of order) sequences using symmetry-based recoupling schemes built from single and composite π pulses. Their performances are compared using the average Hamiltonian theory and experiments at B 0 = 18.8 T on γ -alumina and isopropylamine-templated microporous aluminophosphate (AlPO4 -14), featuring low and significant 1 H-1 H dipolar interactions, respectively. These experiments demonstrate that the 1 H magnetization can be efficiently transferred to 27 Al nuclei using D -RINEPT with SR 4 1 2 (2700 90180 ) recoupling and using PRESTO with R 22 2 7 (1800 ) or R 16 7 6 (2700 90180 ) schemes at ν R = 20 or 62.5 kHz, respectively. The D -RINEPT and PRESTO recoupling schemes complement each other since the latter is affected by dipolar truncation, whereas the former is not. We also analyze the losses during these recoupling schemes, and we show how these magnetization transfers can be used at ν R = 62.5 kHz to acquire in 72 min 2D HETCOR (heteronuclear correlation) spectra between 1 H and quadrupolar nuclei, with a non-uniform sampling (NUS).
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Affiliation(s)
- Jennifer S. Gómez
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 – UCCS – Unité de Catalyse et Chimie du Solide, Lille, 59000, France
| | - Andrew G. M. Rankin
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 – UCCS – Unité de Catalyse et Chimie du Solide, Lille, 59000, France
- present address: Sorbonne Université, CNRS, Collège de
France, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), 4 place Jussieu, Paris, 75005, France
| | - Julien Trébosc
- Univ. Lille, CNRS, INRAE, Centrale Lille, Univ. Artois, FR 2638 –
IMEC – Fédération Chevreul, Lille, 59000, France
| | - Frédérique Pourpoint
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 – UCCS – Unité de Catalyse et Chimie du Solide, Lille, 59000, France
| | - Yu Tsutsumi
- Bruker Japan, 3-9 Moriya, Kanagawa, Yokohama, Kanagawa,
221-0022, Japan
| | - Hiroki Nagashima
- Interdisciplinary Research Center for Catalytic Chemistry, National
Institute of Advanced Industrial Science and Technology (AIST), 1-1-1
Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | - Olivier Lafon
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 – UCCS – Unité de Catalyse et Chimie du Solide, Lille, 59000, France
- Institut Universitaire de France, 1 rue Descartes, Paris, 75231,
France
| | - Jean-Paul Amoureux
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 – UCCS – Unité de Catalyse et Chimie du Solide, Lille, 59000, France
- Riken NMR Science and Development Division, Yokohama, Kanagawa, 230-0045, Japan
- Bruker Biospin, 34 rue de l'industrie, Wissembourg, 67166, France
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20
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El Hariri El Nokab M, Sebakhy KO. Solid State NMR Spectroscopy a Valuable Technique for Structural Insights of Advanced Thin Film Materials: A Review. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:1494. [PMID: 34200088 PMCID: PMC8228666 DOI: 10.3390/nano11061494] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Revised: 05/31/2021] [Accepted: 06/02/2021] [Indexed: 01/05/2023]
Abstract
Solid-state NMR has proven to be a versatile technique for studying the chemical structure, 3D structure and dynamics of all sorts of chemical compounds. In nanotechnology and particularly in thin films, the study of chemical modification, molecular packing, end chain motion, distance determination and solvent-matrix interactions is essential for controlling the final product properties and applications. Despite its atomic-level research capabilities and recent technical advancements, solid-state NMR is still lacking behind other spectroscopic techniques in the field of thin films due to the underestimation of NMR capabilities, availability, great variety of nuclei and pulse sequences, lack of sensitivity for quadrupole nuclei and time-consuming experiments. This article will comprehensively and critically review the work done by solid-state NMR on different types of thin films and the most advanced NMR strategies, which are beyond conventional, and the hardware design used to overcome the technical issues in thin-film research.
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Affiliation(s)
- Mustapha El Hariri El Nokab
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands;
| | - Khaled O. Sebakhy
- Engineering and Technology Institute Groningen, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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21
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Stamou C, Papawassiliou W, Carvalho JP, Konidaris KF, Bekiari V, Dechambenoit P, Pell AJ, Perlepes SP. Indium(III) in the “Periodic Table” of Di(2-pyridyl) Ketone: An Unprecedented Transformation of the Ligand and Solid-State 115In NMR Spectroscopy as a Valuable Structural Tool. Inorg Chem 2021; 60:4829-4840. [DOI: 10.1021/acs.inorgchem.0c03725] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Christina Stamou
- Department of Chemistry, University of Patras, Patras 26504, Greece
| | - Wassilios Papawassiliou
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, Svante Arrhenius vag 16C, Stockholm SE-10691, Sweden
| | - José P. Carvalho
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, Svante Arrhenius vag 16C, Stockholm SE-10691, Sweden
| | | | - Vlasoula Bekiari
- Department of Crop Science, University of Patras, Messolonghi 30200, Greece
| | - Pierre Dechambenoit
- University of Bordeaux, CNRS, Centre de Recherche Paul Pascal, UMR 5031, Pessac 33600, France
| | - Andrew J. Pell
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, Svante Arrhenius vag 16C, Stockholm SE-10691, Sweden
- Université de Lyon, Centre de RMN à Très Hauts Champs de Lyon, FRE 2034-CNRS, ENS Lyon, UCB Lyon 1, 5 rue de la Doua, Villeurbanne 69100, France
| | - Spyros P. Perlepes
- Department of Chemistry, University of Patras, Patras 26504, Greece
- Foundation for Research and Technology−Hellas (FORTH), Institute of Chemical Engineering Sciences (ICE-HT), Platani,
P.O. Box 1414, Patras 26504, Greece
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22
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Ashbrook SE, Davis ZH, Morris RE, Rice CM. 17O NMR spectroscopy of crystalline microporous materials. Chem Sci 2021; 12:5016-5036. [PMID: 34163746 PMCID: PMC8179582 DOI: 10.1039/d1sc00552a] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 02/25/2021] [Indexed: 12/16/2022] Open
Abstract
Microporous materials, containing pores and channels of similar dimensions to small molecules have a range of applications in catalysis, gas storage and separation and in drug delivery. Their complex structure, often containing different types and levels of positional, compositional and temporal disorder, makes structural characterisation challenging, with information on both long-range order and the local environment required to understand the structure-property relationships and improve the future design of functional materials. In principle, 17O NMR spectroscopy should offer an ideal tool, with oxygen atoms lining the pores of many zeolites and phosphate frameworks, playing a vital role in host-guest chemistry and reactivity, and linking the organic and inorganic components of metal-organic frameworks (MOFs). However, routine study is challenging, primarily as a result of the low natural abundance of this isotope (0.037%), exacerbated by the presence of the quadrupolar interaction that broadens the spectral lines and hinders the extraction of information. In this Perspective, we will highlight the current state-of-the-art for 17O NMR of microporous materials, focusing in particular on cost-effective and atom-efficient approaches to enrichment, the use of enrichment to explore chemical reactivity, the challenge of spectral interpretation and the approaches used to help this and the information that can be obtained from NMR spectra. Finally, we will turn to the remaining challenges, including further improving sensitivity, the high-throughput generation of multiple structural models for computational study and the possibility of in situ and in operando measurements, and give a personal perspective on how these required improvements can be used to help solve important problems in microporous materials chemistry.
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Affiliation(s)
- Sharon E Ashbrook
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance, University of St Andrews St Andrews KY16 9ST UK
| | - Zachary H Davis
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance, University of St Andrews St Andrews KY16 9ST UK
| | - Russell E Morris
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance, University of St Andrews St Andrews KY16 9ST UK
| | - Cameron M Rice
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance, University of St Andrews St Andrews KY16 9ST UK
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23
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Shi M, Jin X, Wan Z, He X. Automated fragmentation quantum mechanical calculation of 13C and 1H chemical shifts in molecular crystals. J Chem Phys 2021; 154:064502. [PMID: 33588539 DOI: 10.1063/5.0039115] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this work, the automated fragmentation quantum mechanics/molecular mechanics (AF-QM/MM) approach was applied to calculate the 13C and 1H nuclear magnetic resonance (NMR) chemical shifts in molecular crystals. Two benchmark sets of molecular crystals were selected to calculate the NMR chemical shifts. Systematic investigation was conducted to examine the convergence of AF-QM/MM calculations and the impact of various density functionals with different basis sets on the NMR chemical shift prediction. The result demonstrates that the calculated NMR chemical shifts are close to convergence when the distance threshold for the QM region is larger than 3.5 Å. For 13C chemical shift calculations, the mPW1PW91 functional is the best density functional among the functionals chosen in this study (namely, B3LYP, B3PW91, M06-2X, M06-L, mPW1PW91, OB98, and OPBE), while the OB98 functional is more suitable for the 1H NMR chemical shift prediction of molecular crystals. Moreover, with the B3LYP functional, at least a triple-ζ basis set should be utilized to accurately reproduce the experimental 13C and 1H chemical shifts. The employment of diffuse basis functions will further improve the accuracy for 13C chemical shift calculations, but not for the 1H chemical shift prediction. We further proposed a fragmentation scheme of dividing the central molecule into smaller fragments. By comparing with the results of the fragmentation scheme using the entire central molecule as the core region, the AF-QM/MM calculations with the fragmented central molecule can not only achieve accurate results but also reduce the computational cost. Therefore, the AF-QM/MM approach is capable of predicting the 13C and 1H NMR chemical shifts for molecular crystals accurately and effectively, and could be utilized for dealing with more complex periodic systems such as macromolecular polymers and biomacromolecules. The AF-QM/MM program for molecular crystals is available at https://github.com/shiman1995/NMR.
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Affiliation(s)
- Man Shi
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
| | - Xinsheng Jin
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
| | - Zheng Wan
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
| | - Xiao He
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
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Reif B, Ashbrook SE, Emsley L, Hong M. Solid-state NMR spectroscopy. NATURE REVIEWS. METHODS PRIMERS 2021; 1:2. [PMID: 34368784 PMCID: PMC8341432 DOI: 10.1038/s43586-020-00002-1] [Citation(s) in RCA: 182] [Impact Index Per Article: 60.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/29/2020] [Indexed: 12/18/2022]
Abstract
Solid-state nuclear magnetic resonance (NMR) spectroscopy is an atomic-level method used to determine the chemical structure, three-dimensional structure, and dynamics of solids and semi-solids. This Primer summarizes the basic principles of NMR as applied to the wide range of solid systems. The fundamental nuclear spin interactions and the effects of magnetic fields and radiofrequency pulses on nuclear spins are the same as in liquid-state NMR. However, because of the anisotropy of the interactions in the solid state, the majority of high-resolution solid-state NMR spectra is measured under magic-angle spinning (MAS), which has profound effects on the types of radiofrequency pulse sequences required to extract structural and dynamical information. We describe the most common MAS NMR experiments and data analysis approaches for investigating biological macromolecules, organic materials, and inorganic solids. Continuing development of sensitivity-enhancement approaches, including 1H-detected fast MAS experiments, dynamic nuclear polarization, and experiments tailored to ultrahigh magnetic fields, is described. We highlight recent applications of solid-state NMR to biological and materials chemistry. The Primer ends with a discussion of current limitations of NMR to study solids, and points to future avenues of development to further enhance the capabilities of this sophisticated spectroscopy for new applications.
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Affiliation(s)
- Bernd Reif
- Technische Universität München, Department Chemie, Lichtenbergstr. 4, D-85747 Garching, Germany
| | - Sharon E. Ashbrook
- School of Chemistry, University of St Andrews, North Haugh, St Andrews, KY16 9ST, UK
| | - Lyndon Emsley
- École Polytechnique Fédérale de Lausanne (EPFL), Institut des sciences et ingénierie chimiques, CH-1015 Lausanne, Switzerland
| | - Mei Hong
- Department of Chemistry and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, 170 Albany Street, Cambridge, MA 02139
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25
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Gardner LJ, Walling SA, Lawson SM, Sun S, Bernal SA, Corkhill CL, Provis JL, Apperley DC, Iuga D, Hanna JV, Hyatt NC. Characterization of and Structural Insight into Struvite-K, MgKPO 4·6H 2O, an Analogue of Struvite. Inorg Chem 2021; 60:195-205. [PMID: 33315376 DOI: 10.1021/acs.inorgchem.0c02802] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Struvite-K (MgKPO4·6H2O) is a magnesium potassium phosphate mineral with naturally cementitious properties, which is finding increasing usage as an inorganic cement for niche applications including nuclear waste management and rapid road repair. Struvite-K is also of interest in sustainable phosphate recovery from wastewater and, as such, a detailed knowledge of the crystal chemistry and high-temperature behavior is required to support further laboratory investigations and industrial applications. In this study, the local chemical environments of synthetic struvite-K were investigated using high-field solid-state 25Mg and 39K MAS NMR techniques, alongside 31P MAS NMR and thermal analysis. A single resonance was present in each of the 25Mg and 39K MAS NMR spectra, reported here for the first time alongside the experimental and calculated isotropic chemical shifts, which were comparable to the available data for isostructural struvite (MgNH4PO4·6H2O). An in situ high-temperature XRD analysis of struvite-K revealed the presence of a crystalline-amorphous-crystalline transition that occurred between 30 and 350 °C, following the single dehydration step of struvite-K. Between 50 and 300 °C, struvite-K dehydration yielded a transient disordered (amorphous) phase identified here for the first time, denoted δ-MgKPO4. At 350 °C, recrystallization was observed, yielding β-MgKPO4, commensurate with an endothermic DTA event. A subsequent phase transition to γ-MgKPO4 was observed on further heating, which reversed on cooling, resulting in the α-MgKPO4 structure stabilized at room temperature. This behavior was dissimilar from that of struvite exposed to high temperature, where NH4 liberation occurs at temperatures >50 °C, indicating that struvite-K could potentially withstand high temperatures via a transition to MgKPO4.
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Affiliation(s)
- Laura J Gardner
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Samuel A Walling
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Sebastian M Lawson
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Shikuan Sun
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Susan A Bernal
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Claire L Corkhill
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - John L Provis
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - David C Apperley
- Department of Chemistry, Durham University, Lower Mountjoy, Stockton Road ,Durham DH1 3LE, U.K
| | - Dinu Iuga
- Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, U.K
| | - John V Hanna
- Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, U.K
| | - Neil C Hyatt
- Immobilisation Science Laboratory, Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
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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: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [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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27
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Wang Q, Nielsen UG. Applications of solid-state NMR spectroscopy in environmental science. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2020; 110:101698. [PMID: 33130521 DOI: 10.1016/j.ssnmr.2020.101698] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 10/13/2020] [Accepted: 10/13/2020] [Indexed: 06/11/2023]
Abstract
Environmental science is an interdisciplinary field, which integrates chemical, physical, and biological sciences to study environmental problems and human impact on the environment. This article highlights the use of solid-state NMR spectroscopy (SSNMR) in studies of environmental processes and remediation with examples from both laboratory studies and samples collected in the field. The contemporary topics presented include soil chemistry, environmental remediation (e.g., heavy metals and radionuclides removal, carbon dioxide mineralization), and phosphorus recovery. SSNMR is a powerful technique, which provides atomic-level information about speciation in complex environmental samples as well as the interactions between pollutants and minerals/organic matter on different environmental interfaces. The challenges in the application of SSNMR in environmental science (e.g., measurement of paramagnetic nuclei and low-gamma nuclei) are also discussed, and perspectives are provided for the future research efforts.
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Affiliation(s)
- Qian Wang
- Department of Physics, Chemistry, and Pharmacy, University of Southern Denmark, Campusvej 55, 5230, Odense M, Denmark
| | - Ulla Gro Nielsen
- Department of Physics, Chemistry, and Pharmacy, University of Southern Denmark, Campusvej 55, 5230, Odense M, Denmark.
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28
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Analysis of Photosynthetic Systems and Their Applications with Mathematical and Computational Models. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10196821] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In biological and life science applications, photosynthesis is an important process that involves the absorption and transformation of sunlight into chemical energy. During the photosynthesis process, the light photons are captured by the green chlorophyll pigments in their photosynthetic antennae and further funneled to the reaction center. One of the most important light harvesting complexes that are highly important in the study of photosynthesis is the membrane-attached Fenna–Matthews–Olson (FMO) complex found in the green sulfur bacteria. In this review, we discuss the mathematical formulations and computational modeling of some of the light harvesting complexes including FMO. The most recent research developments in the photosynthetic light harvesting complexes are thoroughly discussed. The theoretical background related to the spectral density, quantum coherence and density functional theory has been elaborated. Furthermore, details about the transfer and excitation of energy in different sites of the FMO complex along with other vital photosynthetic light harvesting complexes have also been provided. Finally, we conclude this review by providing the current and potential applications in environmental science, energy, health and medicine, where such mathematical and computational studies of the photosynthesis and the light harvesting complexes can be readily integrated.
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29
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A Practical Review of NMR Lineshapes for Spin-1/2 and Quadrupolar Nuclei in Disordered Materials. Int J Mol Sci 2020; 21:ijms21165666. [PMID: 32784642 PMCID: PMC7461203 DOI: 10.3390/ijms21165666] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 07/31/2020] [Accepted: 08/05/2020] [Indexed: 01/06/2023] Open
Abstract
NMR is a powerful spectroscopic method that can provide information on the structural disorder in solids, complementing scattering and diffraction techniques. The structural disorder in solids can generate a dispersion of local magnetic and electric fields, resulting in a distribution of isotropic chemical shift δiso and quadrupolar coupling CQ. For spin-1/2 nuclei, the NMR linewidth and shape under high-resolution magic-angle spinning (MAS) reflects the distributions of isotropic chemical shift, providing a rich source of disorder information. For quadrupolar nuclei, the second-order quadrupolar broadening remains present even under MAS. In addition to isotropic chemical shift, structural disorder can impact the electric field gradient (EFG) and consequently the quadrupolar NMR parameters. The distributions of quadrupolar coupling and isotropic chemical shift are superimposed with the second-order quadrupolar broadening, but can be potentially characterized by MQMAS (multiple-quantum magic-angle spinning) spectroscopy. We review analyses of NMR lineshapes in 2D DQ–SQ (double-quantum single-quantum) and MQMAS spectroscopies, to provide a guide for more general lineshape analysis. In addition, methods to enhance the spectral resolution and sensitivity for quadrupolar nuclei are discussed, including NMR pulse techniques and the application of high magnetic fields. The role of magnetic field strength and its impact on the strategy of determining optimum NMR methods for disorder characterization are also discussed.
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30
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Wang Q, Li W, Hung I, Mentink-Vigier F, Wang X, Qi G, Wang X, Gan Z, Xu J, Deng F. Mapping the oxygen structure of γ-Al 2O 3 by high-field solid-state NMR spectroscopy. Nat Commun 2020; 11:3620. [PMID: 32680993 PMCID: PMC7367832 DOI: 10.1038/s41467-020-17470-4] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 06/30/2020] [Indexed: 11/29/2022] Open
Abstract
γ-Al2O3 is one of the most widely used catalysts or catalyst supports in numerous industrial catalytic processes. Understanding the structure of γ-Al2O3 is essential to tuning its physicochemical property, which still remains a great challenge. We report a strategy for the observation and determination of oxygen structure of γ-Al2O3 by using two-dimensional (2D) solid-state NMR spectroscopy at high field. 2D 17O double-quantum single-quantum homonuclear correlation NMR experiment is conducted at an ultra-high magnetic field of 35.2 T to reveal the spatial proximities between different oxygen species from the bulk to surface. Furthermore, 2D proton-detected 1H-17O heteronuclear correlation NMR experiments allow for a rapid identification and differentiation of surface hydroxyl groups and (sub-)surface oxygen species. Our experimental results demonstrate a non-random distribution of oxygen species in γ-Al2O3. γ-Al2O3 is widely used in catalytic processes, but understanding its detailed structure remains a challenge. The authors, using two-dimensional solid-state NMR spectroscopy at a high magnetic field, characterize the spatial proximity and connectivity between oxygen species from the bulk to the surface.
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Affiliation(s)
- Qiang Wang
- National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Wenzheng Li
- National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Ivan Hung
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL, 32310-3706, USA
| | - Frederic Mentink-Vigier
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL, 32310-3706, USA
| | - Xiaoling Wang
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL, 32310-3706, USA
| | - Guodong Qi
- National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Xiang Wang
- National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhehong Gan
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL, 32310-3706, USA
| | - Jun Xu
- National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China. .,Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China.
| | - Feng Deng
- National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China
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31
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Gurung RK, McMillen CD, Jarrett WL, Holder AA. Synthesis, characterization, NMR spectroscopic, and X-ray crystallographic studies of new titanium(IV) Schiff base salen complexes: Formation of intriguing titanium(IV) species. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119496] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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32
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Xu Y, Szell PM, Kumar V, Bryce DL. Solid-state NMR spectroscopy for the analysis of element-based non-covalent interactions. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213237] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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33
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Zhao D, Shen X, Cheng Z, Li W, Dong H, Li S. Accurate and Efficient Prediction of NMR Parameters of Condensed-Phase Systems with the Generalized Energy-Based Fragmentation Method. J Chem Theory Comput 2020; 16:2995-3005. [DOI: 10.1021/acs.jctc.9b01298] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Dongbo Zhao
- School of Chemistry and Chemical Engineering, Nanjing University, 210023 Nanjing, People’s Republic of China
- Kuang Yaming Honors School, Nanjing University, 210023 Nanjing, People’s Republic of China
| | - Xiaoling Shen
- School of Chemistry and Chemical Engineering, Nanjing University, 210023 Nanjing, People’s Republic of China
| | - Zheng Cheng
- School of Chemistry and Chemical Engineering, Nanjing University, 210023 Nanjing, People’s Republic of China
| | - Wei Li
- School of Chemistry and Chemical Engineering, Nanjing University, 210023 Nanjing, People’s Republic of China
| | - Hao Dong
- Kuang Yaming Honors School, Nanjing University, 210023 Nanjing, People’s Republic of China
- Institute for Brain Sciences, Nanjing University, 210023 Nanjing, People’s Republic of China
| | - Shuhua Li
- School of Chemistry and Chemical Engineering, Nanjing University, 210023 Nanjing, People’s Republic of China
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34
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Cook DS, Hooper JE, Dawson DM, Fisher JM, Thompsett D, Ashbrook SE, Walton RI. Synthesis and Polymorphism of Mixed Aluminum-Gallium Oxides. Inorg Chem 2020; 59:3805-3816. [PMID: 32091886 PMCID: PMC7081611 DOI: 10.1021/acs.inorgchem.9b03459] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
The synthesis of
a new solid solution of the oxyhydroxide Ga5–xAlxO7(OH) is investigated
via solvothermal reaction between gallium
acetylacetonate and aluminum isopropoxide in 1,4-butanediol at 240
°C. A limited compositional range of 0 ≤ x ≤ 1.5 is produced, with the hexagonal unit cell parameters
refined from powder X-ray diffraction (XRD) showing a linear contraction
in unit cell volume with an increase in Al content. Solid-state 27Al and 71Ga nuclear magnetic resonance (NMR) spectroscopies
show a strong preference for Ga to occupy the tetrahedral sites and
Al to occupy the octahedral sites. Using isopropanol as the solvent,
γ-Ga2–xAlxO3 defect spinel solid solutions with x ≤ 1.8 can be prepared at 240 °C in 24 h. These materials
are nanocrystalline, as evidenced by their broad diffraction profiles;
however, the refined cubic lattice parameter shows a linear relationship
with the Ga:Al content, and solid-state NMR spectroscopy again shows
a preference for Al to occupy the octahedral sites. Thermal decomposition
of Ga5–xAlxO7(OH) occurs via poorly ordered materials that
resemble ε-Ga2–xAlxO3 and κ-Ga2–xAlxO3, but
γ-Ga2–xAlxO3 transforms above 750 °C to monoclinic β-Ga2–xAlxO3 for 0 ≤ x ≤ 1.3 and to hexagonal
α-Ga2–xAlxO3 for x = 1.8, with intermediate
compositions of 1.3 < x < 1.8 giving mixtures
of the α- and β-polymorphs. Solid-state NMR spectroscopy
shows only the expected octahedral Al for α-Ga2–xAlxO3, and
for β-Ga2–xAlxO3, the ∼1:2 tetrahedral:octahedral
Al ratio is in good agreement with the results of Rietveld analysis
of the average structures against powder XRD data. Relative energies
calculated by periodic density functional theory confirm that there
is an ∼5.2 kJ mol–1 penalty for tetrahedral
rather than octahedral Al in Ga5–xAlxO7(OH), whereas this penalty
is much smaller (∼2.0 kJ mol–1) for β-Ga2–xAlxO3, in good qualitative agreement with the experimental NMR
spectra. Solvothermal reactions in 1,4-butanediol
or isopropanol
yield a new solid solution of the oxyhydroxide Ga5−xAlxO7(OH)
or the spinel series γ-Ga2−xAlxO3, respectively. We have
explored the possible composition range and the thermal stability
of the materials. For γ-Ga2−xAlxO3 (x ≤
1.3), transformation to the monoclinic β-polymorph occurs above
1000 °C, providing a convenient route to this material of interest
for electronic applications.
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Affiliation(s)
- Daniel S Cook
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K
| | - Joseph E Hooper
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance, University of St Andrews, North Haugh, St Andrews KY16 9ST, U.K
| | - Daniel M Dawson
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance, University of St Andrews, North Haugh, St Andrews KY16 9ST, U.K
| | - Janet M Fisher
- Johnson Matthey Technology Centre, Sonning Common, Reading RG4 9NH, U.K
| | - David Thompsett
- Johnson Matthey Technology Centre, Sonning Common, Reading RG4 9NH, U.K
| | - Sharon E Ashbrook
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance, University of St Andrews, North Haugh, St Andrews KY16 9ST, U.K
| | - Richard I Walton
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K
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35
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Culver DB, Huynh W, Tafazolian H, Conley MP. Solid-State 45Sc NMR Studies of Cp* 2Sc–OR (R = CMe 2CF 3, CMe(CF 3) 2, C(CF 3) 3, SiPh 3) and Relationship to the Structure of Cp* 2Sc-Sites Supported on Partially Dehydroxylated Silica. Organometallics 2020. [DOI: 10.1021/acs.organomet.9b00840] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Damien B. Culver
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Winn Huynh
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Hosein Tafazolian
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Matthew P. Conley
- Department of Chemistry, University of California, Riverside, California 92521, United States
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36
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Pugh SM, Wright PA, Law DJ, Thompson N, Ashbrook SE. Facile, Room-Temperature 17O Enrichment of Zeolite Frameworks Revealed by Solid-State NMR Spectroscopy. J Am Chem Soc 2020; 142:900-906. [PMID: 31875398 DOI: 10.1021/jacs.9b10528] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new approach for room-temperature 17O enrichment of zeolites reveals a surprisingly dynamic and labile framework, where rapid and reversible bond breaking takes place. 17O NMR spectroscopy shows that although O sites in both framework Si-O-Al and Si-O-Si linkages are enriched simply on exposure to H217O(l), the enrichment of Si-O-Al species is more rapid, with a more uniform framework enrichment observed at longer durations. We demonstrate that this unexpected enrichment can be observed for two different framework topologies and for Na-exchanged (i.e., nonacidic) zeolites, as well as their protonic forms, confirming that the Brønsted acid proton is not necessary for isotopic exchange into the framework. This work not only offers new opportunities for structural characterization of these chemically and industrially important materials using NMR spectroscopy but suggests that further investigation of the rate and position of enrichment in zeolite frameworks could provide new insight into their chemical reactivity and their stability in aqueous-based applications such as ion exchange and catalysis.
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Affiliation(s)
- Suzi M Pugh
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance , University of St. Andrews , St. Andrews KY16 9ST , U.K
| | - Paul A Wright
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance , University of St. Andrews , St. Andrews KY16 9ST , U.K
| | - David J Law
- BP Chemicals Ltd., Research and Technology Centre , Saltend, Hull HU12 8DS , U.K
| | - Nicholas Thompson
- BP Chemicals Ltd., Research and Technology Centre , Saltend, Hull HU12 8DS , U.K
| | - Sharon E Ashbrook
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance , University of St. Andrews , St. Andrews KY16 9ST , U.K
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37
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Venkatesh A, Luan X, Perras FA, Hung I, Huang W, Rossini AJ. t1-Noise eliminated dipolar heteronuclear multiple-quantum coherence solid-state NMR spectroscopy. Phys Chem Chem Phys 2020; 22:20815-20828. [DOI: 10.1039/d0cp03511d] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
t1-Noise eliminated (TONE) heteronuclear multiple quantum correlation (HMQC) solid-state nuclear magnetic resonance pulse sequences improve the sensitivity of 2D 1H{X} heteronuclear correlation experiments with X = 17O, 25Mg, 27Al and 35Cl.
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Affiliation(s)
- Amrit Venkatesh
- Department of Chemistry
- Iowa State University
- Ames
- USA
- US DOE Ames Laboratory
| | - Xuechen Luan
- Department of Chemistry
- Iowa State University
- Ames
- USA
| | | | - Ivan Hung
- National High Magnetic Field Laboratory (NHMFL)
- Tallahassee
- USA
| | - Wenyu Huang
- Department of Chemistry
- Iowa State University
- Ames
- USA
- US DOE Ames Laboratory
| | - Aaron J. Rossini
- Department of Chemistry
- Iowa State University
- Ames
- USA
- US DOE Ames Laboratory
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38
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Culver DB, Venkatesh A, Huynh W, Rossini AJ, Conley MP. Al(OR F) 3 (R F = C(CF 3) 3) activated silica: a well-defined weakly coordinating surface anion. Chem Sci 2019; 11:1510-1517. [PMID: 34084380 PMCID: PMC8148071 DOI: 10.1039/c9sc05904k] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Weakly Coordinating Anions (WCAs) containing electron deficient delocalized anionic fragments that are reasonably inert allow for the isolation of strong electrophiles. Perfluorinated borates, perfluorinated aluminum alkoxides, and halogenated carborane anions are a few families of WCAs that are commonly used in synthesis. Application of similar design strategies to oxide surfaces is challenging. This paper describes the reaction of Al(ORF)3*PhF (RF = C(CF3)3) with silica partially dehydroxylated at 700 °C (SiO2-700) to form the bridging silanol [triple bond, length as m-dash]Si-OH⋯Al(ORF)3 (1). DFT calculations using small clusters to model 1 show that the gas phase acidity (GPA) of the bridging silanol is 43.2 kcal mol-1 lower than the GPA of H2SO4, but higher than the strongest carborane acids, suggesting that deprotonated 1 would be a WCA. Reactions of 1 with NOct3 show that 1 forms weaker ion-pairs than classical WCAs, but stronger ion-pairs than carborane or borate anions. Though 1 forms stronger ion-pairs than these state-of-the-art WCAs, 1 reacts with alkylsilanes to form silylium type surface species. To the best of our knowledge, this is the first example of a silylium supported on derivatized silica.
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Affiliation(s)
- Damien B Culver
- Department of Chemistry, University of California Riverside California 92521 USA
| | - Amrit Venkatesh
- Department of Chemistry, Iowa State University Ames Iowa 50011 USA
| | - Winn Huynh
- Department of Chemistry, University of California Riverside California 92521 USA
| | - Aaron J Rossini
- Department of Chemistry, Iowa State University Ames Iowa 50011 USA
| | - Matthew P Conley
- Department of Chemistry, University of California Riverside California 92521 USA
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39
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Xin S, Wang Q, Xu J, Chu Y, Wang P, Feng N, Qi G, Trébosc J, Lafon O, Fan W, Deng F. The acidic nature of "NMR-invisible" tri-coordinated framework aluminum species in zeolites. Chem Sci 2019; 10:10159-10169. [PMID: 32055370 PMCID: PMC6979346 DOI: 10.1039/c9sc02634g] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Accepted: 09/11/2019] [Indexed: 01/19/2023] Open
Abstract
The unambiguous characterization of different acid sites in zeolites is of great importance for understanding their catalytic performance and the rational design of highly efficient zeolite catalysts. In addition to various well-characterized extra-framework Al species, a tri-coordinated framework aluminum species can also serve as a Lewis acid site in zeolites, which is "NMR-invisible" owing to its extremely distorted local environment. Here we provide a feasible and reliable approach to elucidate the acidic nature of the tri-coordinated framework Al in dehydrated H-ZSM-5 zeolites via sensitivity-enhanced two-dimensional (2D) multiple nuclear correlation NMR experiments coupled with trimethylphosphine oxide (TMPO) probe molecules. Two types of tri-coordinated framework Al sites have been unambiguously identified, which amount to 11.6% of the total Brønsted and Lewis acid sites. Furthermore, it was found that synergistic effects arising from the close spatial proximity between the tri-coordinated framework Al site and the Brønsted acid site lead to the generation of superacidity (with an acid strength stronger than 100% H2SO4) in the zeolite.
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Affiliation(s)
- Shaohui Xin
- National Centre for Magnetic Resonance in Wuhan , State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics , CAS Key Laboratory of Magnetic Resonance in Biological Systems , Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan 430071 , China . ; .,University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Qiang Wang
- National Centre for Magnetic Resonance in Wuhan , State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics , CAS Key Laboratory of Magnetic Resonance in Biological Systems , Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan 430071 , China . ;
| | - Jun Xu
- National Centre for Magnetic Resonance in Wuhan , State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics , CAS Key Laboratory of Magnetic Resonance in Biological Systems , Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan 430071 , China . ;
| | - Yueying Chu
- National Centre for Magnetic Resonance in Wuhan , State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics , CAS Key Laboratory of Magnetic Resonance in Biological Systems , Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan 430071 , China . ;
| | - Pengfei Wang
- State Key Laboratory of Coal Conversion , Institute of Coal Chemistry , Chinese Academy of Sciences , P.O. Box 165 , Taiyuan , Shanxi 030001 , P. R. China
| | - Ningdong Feng
- National Centre for Magnetic Resonance in Wuhan , State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics , CAS Key Laboratory of Magnetic Resonance in Biological Systems , Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan 430071 , China . ;
| | - Guodong Qi
- National Centre for Magnetic Resonance in Wuhan , State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics , CAS Key Laboratory of Magnetic Resonance in Biological Systems , Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan 430071 , China . ;
| | - Julien Trébosc
- Univ. Lille , CNRS , ENSCL , UMR 8181 , Unité de Catalyse et de Chimie du Solide , 59000 Lille , France
| | - Olivier Lafon
- Univ. Lille , CNRS , ENSCL , UMR 8181 , Unité de Catalyse et de Chimie du Solide , 59000 Lille , France.,Institut Universitaire de France , 75231 Paris , France
| | - Weibin Fan
- State Key Laboratory of Coal Conversion , Institute of Coal Chemistry , Chinese Academy of Sciences , P.O. Box 165 , Taiyuan , Shanxi 030001 , P. R. China
| | - Feng Deng
- National Centre for Magnetic Resonance in Wuhan , State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics , CAS Key Laboratory of Magnetic Resonance in Biological Systems , Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan 430071 , China . ;
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40
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Kanwal N, Colaux H, Dawson DM, Nishiyama Y, Ashbrook SE. Sensitivity improvement in 5QMAS NMR experiments using FAM-N pulses. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2019; 100:1-10. [PMID: 30903912 DOI: 10.1016/j.ssnmr.2019.03.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 03/11/2019] [Accepted: 03/11/2019] [Indexed: 06/09/2023]
Abstract
The multiple-quantum magic-angle spinning (MQMAS) experiment is a popular choice for obtaining high-resolution solid-state NMR spectra of quadrupolar nuclei with half-integer spin quantum number. However, its inherently poor sensitivity limits its application in more challenging systems. In particular, the use of higher-order multiple-quantum coherences, which have the potential to provide higher resolution in the isotropic spectrum, results in a further decrease in sensitivity. Here we extend our recent work, which introduced an automated, high-throughput approach to generate amplitude-modulated composite pulses (termed FAM-N) to improve the efficiency of the conversion of three-quantum coherences, and explore the use of similar pulses in five-quantum MAS experiments. We consider three different approaches, and are able to demonstrate that all three provide good enhancements over single pulse conversion in all but the most extreme cases, and work well at a range of spinning rates. We show that FAM-N pulses are robust to variation in the quadrupolar coupling and rf nutation rate, demonstrating their applicability in multisite systems and systems where direct experimental optimisation of complex composite pulses is not feasible. This work will ease the implementation of higher-order MQMAS experiments and enable their application to materials and systems that were previously deemed too difficult to study.
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Affiliation(s)
- Nasima Kanwal
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance, University of St Andrews, St Andrews, KY16 9ST, UK
| | - Henri Colaux
- RIKEN-JEOL Collaboration Center, Tsurumi, Yokohama, Kanagawa, 230-0045, Japan; Center for Surface Chemistry and Catalysis, KU Leuven, 3001, Heverlee, Belgium
| | - Daniel M Dawson
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance, University of St Andrews, St Andrews, KY16 9ST, UK
| | - Yusuke Nishiyama
- RIKEN-JEOL Collaboration Center, Tsurumi, Yokohama, Kanagawa, 230-0045, Japan; JEOL RESONANCE Inc., Musashino, Akishima, Tokyo, 196-8558, Japan; NMR Science and Development Division, RIKEN SPring-8 Center, Tsurumi, Yokohama, Kanagawa, 230-0045, Japan
| | - Sharon E Ashbrook
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance, University of St Andrews, St Andrews, KY16 9ST, UK.
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41
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Singh S, Nanda R, Dorai K. Structural and dynamical aspects of PEG/LiClO 4 in solvent mixtures via NMR spectroscopy. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2019; 57:412-422. [PMID: 30883938 DOI: 10.1002/mrc.4867] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2018] [Revised: 01/08/2019] [Accepted: 03/10/2019] [Indexed: 06/09/2023]
Abstract
Motivated by the potential usefulness of polyethylene glycol (PEG)/Li+ salt mixtures in several industrial applications, we investigated the structure and dynamics of PEG/LiClO4 mixtures in D2 O and its mixtures with CD3 CN and DMSO-d6 , in a series of PEG-based polymers with a wide variation in their molecular weights. 1 H NMR chemical shifts, T1 /T2 relaxation rates, pulsed-field gradient NMR diffusion experiments, and 2D HOESY NMR studies have been performed to understand the structural and dynamical aspects of these mixtures. Increasing the temperature of the medium results in a significant perturbation in the H-bonded structure of PEG in its PEG/LiClO4 /D2 O mixtures as observed from the increase in chemical shifts. On the other hand, the addition of molecular cosolvents has a negligible effect. The hydrodynamic structure of PEG shows a pronounced variation at low temperature with increasing molecular weight, which, however, disappears at higher temperatures. Increasing the temperature leads to a decrease in the hydrodynamic structure of PEG, which can be explained on the basis of solvation-desolvation phenomena. The 2D HOESY NMR spectra reveal a new finding of Li+ -water binding in the PEG/LiClO4 /D2 O mixtures with the addition of molecular solvents, suggesting that the Li+ cation diffuses freely in the D2 O mixtures of polymers as compared with the polymer mixtures with DMSO or CD3 CN.
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Affiliation(s)
- Satnam Singh
- Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Mohali, India
| | - Raju Nanda
- Department of Chemistry, Michigan State University, East Lansing, MI
| | - Kavita Dorai
- Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Mohali, India
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42
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Stevanato G, Kubicki DJ, Menzildjian G, Chauvin AS, Keller K, Yulikov M, Jeschke G, Mazzanti M, Emsley L. A Factor Two Improvement in High-Field Dynamic Nuclear Polarization from Gd(III) Complexes by Design. J Am Chem Soc 2019; 141:8746-8751. [DOI: 10.1021/jacs.9b03723] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Gabriele Stevanato
- Laboratory of
Magnetic Resonance, Institut des Sciences et Ingéniere Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Dominik Józef Kubicki
- Laboratory of
Magnetic Resonance, Institut des Sciences et Ingéniere Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Georges Menzildjian
- Laboratory of
Magnetic Resonance, Institut des Sciences et Ingéniere Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Anne-Sophie Chauvin
- Group of Coordination
Chemistry, Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Katharina Keller
- Laboratory of Inorganic
Chemistry, Department of Chemistry, Laboratory, ETH Zurich, 8093 Zurich, Switzerland
| | - Maxim Yulikov
- Laboratory of Inorganic
Chemistry, Department of Chemistry, Laboratory, ETH Zurich, 8093 Zurich, Switzerland
| | - Gunnar Jeschke
- Laboratory of Inorganic
Chemistry, Department of Chemistry, Laboratory, ETH Zurich, 8093 Zurich, Switzerland
| | - Marinella Mazzanti
- Group of Coordination
Chemistry, Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Lyndon Emsley
- Laboratory of
Magnetic Resonance, Institut des Sciences et Ingéniere Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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43
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Cui J, Olmsted DL, Mehta AK, Asta M, Hayes SE. NMR Crystallography: Evaluation of Hydrogen Positions in Hydromagnesite by
13
C{
1
H} REDOR Solid‐State NMR and Density Functional Theory Calculation of Chemical Shielding Tensors. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201813306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jinlei Cui
- Department of Chemistry Washington University in St. Louis 1 Brookings Drive, Campus Box 1134 St. Louis MO 63130 USA
| | - David L. Olmsted
- Department of Materials Science and Engineering University of California, Berkeley Berkeley CA USA
| | - Anil K. Mehta
- Department of Chemistry Emory University Atlanta GA USA
| | - Mark Asta
- Department of Materials Science and Engineering University of California, Berkeley Berkeley CA USA
- Materials Science Division Lawrence Berkeley National Laboratory Berkeley CA USA
| | - Sophia E. Hayes
- Department of Chemistry Washington University in St. Louis 1 Brookings Drive, Campus Box 1134 St. Louis MO 63130 USA
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44
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Cui J, Olmsted DL, Mehta AK, Asta M, Hayes SE. NMR Crystallography: Evaluation of Hydrogen Positions in Hydromagnesite by 13 C{ 1 H} REDOR Solid-State NMR and Density Functional Theory Calculation of Chemical Shielding Tensors. Angew Chem Int Ed Engl 2019; 58:4210-4216. [PMID: 30672073 DOI: 10.1002/anie.201813306] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 01/08/2019] [Indexed: 12/24/2022]
Abstract
Solid-state NMR measurements coupled with density functional theory (DFT) calculations demonstrate how hydrogen positions can be refined in a crystalline system. The precision afforded by rotational-echo double-resonance (REDOR) NMR to interrogate 13 C-1 H distances is exploited along with DFT determinations of the 13 C tensor of carbonates (CO3 2- ). Nearby 1 H nuclei perturb the axial symmetry of the carbonate sites in the hydrated carbonate mineral, hydromagnesite [4 MgCO3 ⋅Mg(OH)2 ⋅4 H2 O]. A match between the calculated structure and solid-state NMR was found by testing multiple semi-local and dispersion-corrected DFT functionals and applying them to optimize atom positions, starting from X-ray diffraction (XRD)-determined atomic coordinates. This was validated by comparing calculated to experimental 13 C{1 H} REDOR and 13 C chemical shift anisotropy (CSA) tensor values. The results show that the combination of solid-state NMR, XRD, and DFT can improve structure refinement for hydrated materials.
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Affiliation(s)
- Jinlei Cui
- Department of Chemistry, Washington University in St. Louis, 1 Brookings Drive, Campus Box 1134, St. Louis, MO, 63130, USA
| | - David L Olmsted
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, USA
| | - Anil K Mehta
- Department of Chemistry, Emory University, Atlanta, GA, USA
| | - Mark Asta
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, USA.,Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Sophia E Hayes
- Department of Chemistry, Washington University in St. Louis, 1 Brookings Drive, Campus Box 1134, St. Louis, MO, 63130, USA
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45
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Giovine R, Trébosc J, Pourpoint F, Lafon O, Amoureux JP. Magnetization transfer from protons to quadrupolar nuclei in solid-state NMR using PRESTO or dipolar-mediated refocused INEPT methods. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2019; 299:109-123. [PMID: 30594000 DOI: 10.1016/j.jmr.2018.12.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Revised: 12/11/2018] [Accepted: 12/17/2018] [Indexed: 06/09/2023]
Abstract
In solid-state NMR spectroscopy, the through-space transfer of magnetization from protons to quadrupolar nuclei is employed to probe proximities between those isotopes. Furthermore, such transfer, in conjunction with Dynamic Nuclear Polarization (DNP), can enhance the NMR sensitivity of quadrupolar nuclei, as it allows the transfer of DNP-enhanced 1H polarization to surrounding nuclei. We compare here the performances of two approaches to achieve such transfer: PRESTO (Phase-shifted Recoupling Effects a Smooth Transfer of Order), which is currently the method of choice to achieve the magnetization transfer from protons to quadrupolar nuclei and which has been shown to supersede Cross-Polarization under Magic-Angle Spinning (MAS) for quadrupolar nuclei and D-RINEPT (Dipolar-mediated Refocused Insensitive Nuclei Enhanced by Polarization Transfer) using symmetry-based SR412 recoupling, which has already been employed to transfer the magnetization in the reverse way from half-integer quadrupolar spin to protons. We also test the PRESTO sequence with R1676 recoupling using 270090180 composite π-pulses as inversion elements. This recoupling scheme, which has previously been proposed to reintroduce 1H Chemical Shift Anisotropy (CSA) at high MAS frequencies with high robustness to rf-field inhomogeneity, has not so far been employed to reintroduce dipolar couplings with protons. These various techniques to transfer magnetization from protons to quadrupolar nuclei are analyzed using (i) an average Hamiltonian theory, (ii) numerical simulations of spin dynamics, and (iii) experimental 1H → 27Al and 1H → 17O transfers in as-synthesized AlPO4-14 and 17O-labelled fumed silica, respectively. The experiments and simulations are done at two magnetic fields (9.4 and 18.8 T) and several spinning speeds (15, 18-24 and 60 kHz). This analysis indicates that owing to its γ-encoded character, PRESTO yields the highest transfer efficiency at low magnetic fields and MAS frequencies, whereas owing to its higher robustness to rf-field inhomogeneity and chemical shifts, D-RINEPT is more sensitive at high fields and MAS frequencies, notably for protons exhibiting large offset or CSA, such as those involved in hydrogen bonds.
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Affiliation(s)
- Raynald Giovine
- Univ. Lille, CNRS-8181, UCCS: Unit of Catalysis and Chemistry of Solids, F-59000 Lille, France
| | - Julien Trébosc
- Univ. Lille, CNRS-8181, UCCS: Unit of Catalysis and Chemistry of Solids, F-59000 Lille, France
| | - Frédérique Pourpoint
- Univ. Lille, CNRS-8181, UCCS: Unit of Catalysis and Chemistry of Solids, F-59000 Lille, France
| | - Olivier Lafon
- Univ. Lille, CNRS-8181, UCCS: Unit of Catalysis and Chemistry of Solids, F-59000 Lille, France; IUF, Institut Universitaire de France, 1 rue Descartes, 75231 Paris, France.
| | - Jean-Paul Amoureux
- Univ. Lille, CNRS-8181, UCCS: Unit of Catalysis and Chemistry of Solids, F-59000 Lille, France; Bruker France, 34 rue de l'Industrie, F-67166 Wissembourg, France.
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46
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Nagashima H, Lilly Thankamony AS, Trébosc J, Montagne L, Kerven G, Amoureux JP, Lafon O. Observation of proximities between spin-1/2 and quadrupolar nuclei in solids: Improved robustness to chemical shielding using adiabatic symmetry-based recoupling. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2018; 94:7-19. [PMID: 30103084 DOI: 10.1016/j.ssnmr.2018.07.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 07/17/2018] [Accepted: 07/17/2018] [Indexed: 06/08/2023]
Abstract
We introduce a novel heteronuclear dipolar recoupling based on the R21-1 symmetry, which uses the tanh/tan (tt) shaped pulse as a basic inversion element and is denoted R21-1(tt). Using first-order average Hamiltonian theory, we show that this sequence is non-γ-encoded and that it reintroduces the |m| = 1 spatial component of the Chemical Shift Anisotropy (CSA) of the irradiated isotope and its heteronuclear dipolar interactions. Using numerical simulations and one-dimensional (1D) 27Al-{31P} through-space D-HMQC (Dipolar Heteronuclear Multiple-Quantum Correlation) experiments on VPI-5, we compare the performances of this recoupling to those of other non-γ-encoded |m| = 1 heteronuclear recoupling schemes: REDOR (Rotational-Echo DOuble Resonance), SFAM (Simultaneous Frequency and Amplitude Modulation) and R42-1(tt). Such comparison indicates that the R21-1(tt) scheme is more robust to CSA, offset and radiofrequency field inhomogeneities than the other schemes. We take advantage of the high robustness of R21-1(tt) to CSA and offset to demonstrate the possibility to correlate the signals of 207Pb isotope with those of neighboring half-integer spin quadrupolar nuclei. Such approach is demonstrated experimentally by acquiring 11B-{207Pb} D-HMQC 2D spectra of Pb4O(BO3)2 crystalline powder.
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Affiliation(s)
- Hiroki Nagashima
- Univ. Lille, CNRS-8181, UCCS-Unit of Catalysis and Chemistry of Solids, F-59000, Lille, France; Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | | | - Julien Trébosc
- Univ. Lille, CNRS-8181, UCCS-Unit of Catalysis and Chemistry of Solids, F-59000, Lille, France
| | - Lionel Montagne
- Univ. Lille, CNRS-8181, UCCS-Unit of Catalysis and Chemistry of Solids, F-59000, Lille, France
| | - Gwendal Kerven
- Univ. Lorraine, CNRS-7036, CRM2, F-54506, Vandœuvre-lès-Nancy, France
| | - Jean-Paul Amoureux
- Univ. Lille, CNRS-8181, UCCS-Unit of Catalysis and Chemistry of Solids, F-59000, Lille, France; Bruker Biospin, 34 rue de l'industrie, F-67166, Wissembourg, France.
| | - Olivier Lafon
- Univ. Lille, CNRS-8181, UCCS-Unit of Catalysis and Chemistry of Solids, F-59000, Lille, France; Institut Universitaire de France, 1 rue Descartes, F-75231, Paris, France.
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47
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Chen S, Lucier BEG, Luo W, Xie X, Feng K, Chan H, Terskikh VV, Sun X, Sham TK, Workentin MS, Huang Y. Loading across the Periodic Table: Introducing 14 Different Metal Ions To Enhance Metal-Organic Framework Performance. ACS APPLIED MATERIALS & INTERFACES 2018; 10:30296-30305. [PMID: 30124282 DOI: 10.1021/acsami.8b08496] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Loading metal guests within metal-organic frameworks (MOFs) via secondary functional groups is a promising route for introducing or enhancing MOF performance in various applications. In this work, 14 metal ions (Li+, Na+, K+, Mg2+, Ca2+, Ba2+, Zn2+, Co2+, Mn2+, Ag+, Cd2+, La3+, In3+, and Pb2+) have been successfully introduced within the MIL-121 MOF using a cost-efficient route involving free carboxylic groups on the linker. The local and long-range structure of the metal-loaded MOFs is characterized using multinuclear solid-state NMR and X-ray diffraction methods. Li/Mg/Ca-loaded MIL-121 and Ag nanoparticle-loaded MIL-121 exhibit enhanced H2 and CO2 adsorption; Ag nanoparticle-loaded MIL-121 also demonstrates remarkable catalytic activity in the reduction of 4-nitrophenol.
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Affiliation(s)
- Shoushun Chen
- Department of Chemistry , University of Western Ontario , London , Ontario N6A 5B7 , Canada
| | - Bryan E G Lucier
- Department of Chemistry , University of Western Ontario , London , Ontario N6A 5B7 , Canada
| | - Wilson Luo
- Department of Chemistry , University of Western Ontario , London , Ontario N6A 5B7 , Canada
| | - Xinkai Xie
- Institute of Functional Nano & Soft Materials Laboratory (FUNSOM) & Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices , Soochow University , Jiangsu 215123 , P. R. China
| | - Kun Feng
- Institute of Functional Nano & Soft Materials Laboratory (FUNSOM) & Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices , Soochow University , Jiangsu 215123 , P. R. China
| | - Hendrick Chan
- Department of Chemistry , University of Western Ontario , London , Ontario N6A 5B7 , Canada
| | - Victor V Terskikh
- Department of Chemistry , University of Ottawa , Ottawa , Ontario K1N 6N5 , Canada
| | - Xuhui Sun
- Institute of Functional Nano & Soft Materials Laboratory (FUNSOM) & Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices , Soochow University , Jiangsu 215123 , P. R. China
| | - Tsun-Kong Sham
- Department of Chemistry , University of Western Ontario , London , Ontario N6A 5B7 , Canada
| | - Mark S Workentin
- Department of Chemistry , University of Western Ontario , London , Ontario N6A 5B7 , Canada
| | - Yining Huang
- Department of Chemistry , University of Western Ontario , London , Ontario N6A 5B7 , Canada
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48
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Li Y, Trébosc J, Hu B, Shen M, Amoureux JP, Lafon O. Indirect detection of broad spectra in solid-state NMR using interleaved DANTE trains. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2018; 294:101-114. [PMID: 30032034 DOI: 10.1016/j.jmr.2018.07.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 07/03/2018] [Accepted: 07/07/2018] [Indexed: 06/08/2023]
Abstract
We analyze the performances and the optimization of 1H-{I} HMQC experiments using basic and interleaved DANTE schemes for the indirect detection of nuclei I = 1/2 or 1 exhibiting wide lines dominated by chemical shift anisotropy (CSA) or quadrupole interaction, respectively. These sequences are first described using average Hamiltonian theory. Then, we analyze using numerical simulations (i) the optimal lengths of the DANTE train and the individual pulses, (ii) the robustness of these experiments to offset, and (iii) the optimal choice of the defocusing and refocusing times for both 1H-{I} J- and D-HMQC sequences for 195Pt (I = 1/2) and 14N (I = 1) nuclei subject to large CSA and quadrupole interaction, respectively. These simulations are compared to 1H-{14N} D-HMQC experiments on γ-glycine and L-histidine.HCl at B0 = 18.8 T and MAS frequency of 62.5 kHz. The present study shows that (i) the optimal defocusing and refocusing times do not depend on the chosen DANTE scheme, (ii) the DANTE trains must be applied with the highest rf-field compatible with the probe specifications and the stability of the sample, (iii) the excitation bandwidth along the indirect dimension of HMQC sequence using DANTE trains is inversely proportional to their length, (iv) interleaved DANTE trains increase the excitation bandwidth of these sequences, and (v) dephasing under residual 1H-1H and 1H-I dipolar couplings, as well as 14N second-order quadrupole interaction, during the length of the DANTE scheme attenuate the transfer efficiency.
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Affiliation(s)
- Yixuan Li
- Univ. Lille, CNRS, UMR 8181-UCCS, Unité de Catalyse et de Chimie du Solide, F-59000 Lille, France; Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, Shanghai 200062, China
| | - Julien Trébosc
- Univ. Lille, CNRS, UMR 8181-UCCS, Unité de Catalyse et de Chimie du Solide, F-59000 Lille, France
| | - Bingwen Hu
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, Shanghai 200062, China
| | - Ming Shen
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, Shanghai 200062, China
| | - Jean-Paul Amoureux
- Univ. Lille, CNRS, UMR 8181-UCCS, Unité de Catalyse et de Chimie du Solide, F-59000 Lille, France; Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, Shanghai 200062, China; Bruker France, 34 rue de l'Industrie, F-67166 Wissembourg, France.
| | - Olivier Lafon
- Univ. Lille, CNRS, UMR 8181-UCCS, Unité de Catalyse et de Chimie du Solide, F-59000 Lille, France; Institut Universitaire de France, 1, rue Descartes, 75231 Paris, France.
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49
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Paul G, Bisio C, Braschi I, Cossi M, Gatti G, Gianotti E, Marchese L. Combined solid-state NMR, FT-IR and computational studies on layered and porous materials. Chem Soc Rev 2018; 47:5684-5739. [PMID: 30014075 DOI: 10.1039/c7cs00358g] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Understanding the structure-property relationship of solids is of utmost relevance for efficient chemical processes and technological applications in industries. This contribution reviews the concept of coupling three well-known characterization techniques (solid-state NMR, FT-IR and computational methods) for the study of solid state materials which possess 2D and 3D architectures and discusses the way it will benefit the scientific communities. It highlights the most fundamental and applied aspects of the proactive combined approach strategies to gather information at a molecular level. The integrated approach involving multiple spectroscopic and computational methods allows achieving an in-depth understanding of the surface, interfacial and confined space processes that are beneficial for the establishment of structure-property relationships. The role of ssNMR/FT-IR spectroscopic properties of probe molecules in monitoring the strength and distribution of catalytic active sites and their accessibility at the porous/layered surface is discussed. Both experimental and theoretical aspects will be considered by reporting relevant examples. This review also identifies and discusses the progress, challenges and future prospects in the field of synthesis and applications of layered and porous solids.
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Affiliation(s)
- Geo Paul
- Department of Science and Technological Innovation, Università del Piemonte Orientale, Viale T. Michel 11, 15121 Alessandria, Italy.
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50
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Ashbrook SE, Hodgkinson P. Perspective: Current advances in solid-state NMR spectroscopy. J Chem Phys 2018; 149:040901. [PMID: 30068173 DOI: 10.1063/1.5038547] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
In contrast to the rapid and revolutionary impact of solution-state Nuclear Magnetic Resonance (NMR) on modern chemistry, the field of solid-state NMR has matured more slowly. This reflects the major technical challenges of much reduced spectral resolution and sensitivity in solid-state as compared to solution-state spectra, as well as the relative complexity of the solid state. In this perspective, we outline the technique developments that have pushed resolution to intrinsic limits and the approaches, including ongoing major developments in the field of Dynamic Nuclear Polarisation, that have enhanced spectral sensitivity. The information on local structure and dynamics that can be obtained using these gains in sensitivity and resolution is illustrated with a diverse range of examples from large biomolecules to energy materials and pharmaceuticals and from both ordered and highly disordered materials. We discuss how parallel developments in quantum chemical calculation, particularly density functional theory, have enabled experimental data to be translated directly into information on local structure and dynamics, giving rise to the developing field of "NMR crystallography."
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Affiliation(s)
- Sharon E Ashbrook
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance, University of St Andrews, St Andrews KY16 9ST, United Kingdom
| | - Paul Hodgkinson
- Department of Chemistry, Durham University, Durham DH1 4RD, United Kingdom
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