1
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Zhou X, Price GA, Sunley GJ, Copéret C. Small Cobalt Nanoparticles Favor Reverse Water-Gas Shift Reaction Over Methanation Under CO 2 Hydrogenation Conditions. Angew Chem Int Ed Engl 2023; 62:e202314274. [PMID: 37955591 DOI: 10.1002/anie.202314274] [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: 09/23/2023] [Revised: 11/13/2023] [Accepted: 11/13/2023] [Indexed: 11/14/2023]
Abstract
Cobalt-based catalysts are well-known to convert syngas into a variety of Fischer-Tropsch (FTS) products depending on the various reaction parameters, in particular particle size. In contrast, the reactivity of these particles has been much less investigated in the context of CO2 hydrogenation. In that context, Surface organometallic chemistry (SOMC) was employed to synthesize highly dispersed cobalt nanoparticles (Co-NPs) with particle sizes ranging from 1.6 to 3.0 nm. These SOMC-derived Co-NPs display significantly different catalytic performances under CO2 hydrogenation conditions: while the smallest cobalt nanoparticles (1.6 nm) catalyze mainly the reverse water-gas shift (rWGS) reaction, the larger nanoparticles (2.1-3.0 nm) favor the expected methanation activity. Operando X-ray absorption spectroscopy shows that the smaller cobalt particles are fully oxidized under CO2 hydrogenation conditions, while the larger ones remain mostly metallic, paralleling the observed difference of catalytic performances. This fundamental shift of selectivity, away from methanation to reverse water-gas shift for the smaller nanoparticles is noteworthy and correlates with the formation of CoO under CO2 hydrogenation conditions.
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Affiliation(s)
- Xiaoyu Zhou
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1-5, 8093, Zürich, Switzerland
| | - Gregory A Price
- BP Innovation & Engineering, Applied Sciences, BP plc, Saltend, Hull, HU12 8DS, UK
| | - Glenn J Sunley
- BP Innovation & Engineering, Applied Sciences, BP plc, Saltend, Hull, HU12 8DS, UK
| | - Christophe Copéret
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1-5, 8093, Zürich, Switzerland
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2
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Parsons LWT, Berben LA. Metallated dihydropyridinates: prospects in hydride transfer and (electro)catalysis. Chem Sci 2023; 14:8234-8248. [PMID: 37564402 PMCID: PMC10411630 DOI: 10.1039/d3sc02080k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Accepted: 07/14/2023] [Indexed: 08/12/2023] Open
Abstract
Hydride transfer (HT) is a fundamental step in a wide range of reaction pathways, including those mediated by dihydropyridinates (DHP-s). Coordination of ions directly to the pyridine ring or functional groups stemming therefrom, provides a powerful approach for influencing the electronic structure and in turn HT chemistry. Much of the work in this area is inspired by the chemistry of bioinorganic systems including NADH. Coordination of metal ions to pyridines lowers the electron density in the pyridine ring and lowers the reduction potential: lower-energy reactions and enhanced selectivity are two outcomes from these modifications. Herein, we discuss approaches for the preparation of DHP-metal complexes and selected examples of their reactivity. We suggest further areas in which these metallated DHP-s could be developed and applied in synthesis and catalysis.
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Affiliation(s)
- Leo W T Parsons
- Department of Chemistry, University of California Davis CA 95616 USA
| | - Louise A Berben
- Department of Chemistry, University of California Davis CA 95616 USA
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3
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Venkatesh A, Gioffrè D, Atterberry BA, Rochlitz L, Carnahan SL, Wang Z, Menzildjian G, Lesage A, Copéret C, Rossini AJ. Molecular and Electronic Structure of Isolated Platinum Sites Enabled by the Expedient Measurement of 195Pt Chemical Shift Anisotropy. J Am Chem Soc 2022; 144:13511-13525. [PMID: 35861681 DOI: 10.1021/jacs.2c02300] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Techniques that can characterize the molecular structures of dilute surface species are required to facilitate the rational synthesis and improvement of Pt-based heterogeneous catalysts. 195Pt solid-state NMR spectroscopy could be an ideal tool for this task because 195Pt isotropic chemical shifts and chemical shift anisotropy (CSA) are highly sensitive probes of the local chemical environment and electronic structure. However, the characterization of Pt surface-sites is complicated by the typical low Pt loadings that are between 0.2 and 5 wt% and broadening of 195Pt solid-state NMR spectra by CSA. Here, we introduce a set of solid-state NMR methods that exploit fast MAS and indirect detection using a sensitive spy nucleus (1H or 31P) to enable the rapid acquisition of 195Pt MAS NMR spectra. We demonstrate that high-resolution wideline 195Pt MAS NMR spectra can be acquired in minutes to a few hours for a series of molecular and single-site Pt species grafted on silica with Pt loading of only 3-5 wt%. Low-power, long-duration, sideband-selective excitation, and saturation pulses are incorporated into t1-noise eliminated dipolar heteronuclear multiple quantum coherence, perfect echo resonance echo saturation pulse double resonance, or J-resolved pulse sequences. The complete 195Pt MAS NMR spectrum is then reconstructed by recording a series of 1D NMR spectra where the offset of the 195Pt pulses is varied in increments of the MAS frequency. Analysis of the 195Pt MAS NMR spectra yields the 195Pt chemical shift tensor parameters. Zeroth order approximation density functional theory calculations accurately predict 195Pt CS tensor parameters. Simple and predictive orbital models relate the CS tensor parameters to the Pt electronic structure and coordination environment. The methodology developed here paves the way for the detailed structural and electronic analysis of dilute platinum surface-sites.
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Affiliation(s)
- Amrit Venkatesh
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,US DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - Domenico Gioffrè
- Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Benjamin A Atterberry
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,US DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - Lukas Rochlitz
- Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Scott L Carnahan
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,US DOE Ames Laboratory, Ames, Iowa 50011, United States
| | - Zhuoran Wang
- Univ Lyon, ENS Lyon, Université Lyon 1, CNRS, High-Field NMR Center of Lyon, UMR 5082, F-69100 Villeurbanne, France
| | - Georges Menzildjian
- Univ Lyon, ENS Lyon, Université Lyon 1, CNRS, High-Field NMR Center of Lyon, UMR 5082, F-69100 Villeurbanne, France
| | - Anne Lesage
- Univ Lyon, ENS Lyon, Université Lyon 1, CNRS, High-Field NMR Center of Lyon, UMR 5082, F-69100 Villeurbanne, France
| | - Christophe Copéret
- Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Aaron J Rossini
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,US DOE Ames Laboratory, Ames, Iowa 50011, United States
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4
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Rommel VML, Fix JM, Böttcher T. Reaction of 2,6‐Bis(diazaboryl)pyridine with Alkyls of Lithium, Zinc and Magnesium. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202100361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | | | - Tobias Böttcher
- Universität Freiburg Institut für Anorganische und Analytische Chemie Albertstr. 21 79104 Freiburg i.Br. GERMANY
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5
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Fandos R, Rodríguez-Delgado A, Rodríguez A, Romero I, Organero JÁ, Álvarez E. Pathways to Metal–Ligand Cooperation in Quinoline-Based Titanium(IV) Pincers: Nonelectrophilic N-methylation, Deprotonation, and Dihydropyridine Formation. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rosa Fandos
- Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Avda. Carlos III, s/n, 45071 Toledo, Spain
| | - Antonio Rodríguez-Delgado
- Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla, C/Américo Vespucio, 49, Isla de la Cartuja, 41092 Sevilla, Spain
| | - Ana Rodríguez
- ETS Ingenieros Industriales, Campus de Ciudad Real, Universidad de Castilla-La Mancha, Avda. Camilo José Cela, 3, 13071 Ciudad Real, Spain
| | - Iván Romero
- Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Avda. Carlos III, s/n, 45071 Toledo, Spain
| | - Juan Ángel Organero
- Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Avda. Carlos III, s/n, 45071 Toledo, Spain
| | - Eleuterio Álvarez
- Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla, C/Américo Vespucio, 49, Isla de la Cartuja, 41092 Sevilla, Spain
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6
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Docherty S, Phongprueksathat N, Lam E, Noh G, Safonova OV, Urakawa A, Copéret C. Silica-Supported PdGa Nanoparticles: Metal Synergy for Highly Active and Selective CO 2-to-CH 3OH Hydrogenation. JACS AU 2021; 1:450-458. [PMID: 34467307 PMCID: PMC8395611 DOI: 10.1021/jacsau.1c00021] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Indexed: 05/08/2023]
Abstract
The direct conversion of CO2 to CH3OH represents an appealing strategy for the mitigation of anthropogenic CO2 emissions. Here, we report that small, narrowly distributed alloyed PdGa nanoparticles, prepared via surface organometallic chemistry from silica-supported GaIII isolated sites, selectively catalyze the hydrogenation of CO2 to CH3OH. At 230 °C and 25 bar, high activity (22.3 molMeOH molPd -1 h-1) and selectivity for CH3OH/DME (81%) are observed, while the corresponding silica-supported Pd nanoparticles show low activity and selectivity. X-ray absorption spectroscopy (XAS), IR, NMR, and scanning transmission electron microscopy-energy-dispersive X-ray provide evidence for alloying in the as-synthesized material. In situ XAS reveals that there is a dynamic dealloying/realloying process, through Ga redox, while operando diffuse reflectance infrared Fourier transform spectroscopy demonstrates that, while both methoxy and formate species are observed in reaction conditions, the relative concentrations are inversely proportional, as the chemical potential of the gas phase is modulated. High CH3OH selectivities, across a broad range of conversions, are observed, showing that CO formation is suppressed for this catalyst, in contrast to reported Pd catalysts.
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Affiliation(s)
- Scott
R. Docherty
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, CH-8093 Zurich, Switzerland
| | - Nat Phongprueksathat
- Catalysis
Engineering, Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands
| | - Erwin Lam
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, CH-8093 Zurich, Switzerland
| | - Gina Noh
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, CH-8093 Zurich, Switzerland
| | | | - Atsushi Urakawa
- Catalysis
Engineering, Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands
| | - Christophe Copéret
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, CH-8093 Zurich, Switzerland
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7
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Novák M, Jambor R, Růžičková Z, Podzimek Š. Unique reactivity of an α-ketiminopyridine ligand with metal–alkyls: Synthesis and ROP of ε-caprolactone. NEW J CHEM 2021. [DOI: 10.1039/d0nj05498d] [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
The reaction of an α-ketimininopyridine ligand 2-((Me)CN(C6H3-2,6-iPr2))-6-(OMe)C5H3N (L1) with metal–alkyls, such as MeLi, Et2Zn, Me3Al and Me2AlCl, was studied.
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Affiliation(s)
- Miroslav Novák
- Institute of Chemistry and Technology of Macromolecular Materials
- Faculty of Chemical Technology
- University of Pardubice
- 53210 Pardubice
- Czech Republic
| | - Roman Jambor
- Department of General and Inorganic Chemistry
- Faculty of Chemical Technology
- University of Pardubice
- 53210 Pardubice
- Czech Republic
| | - Zdeňka Růžičková
- Department of General and Inorganic Chemistry
- Faculty of Chemical Technology
- University of Pardubice
- 53210 Pardubice
- Czech Republic
| | - Štěpán Podzimek
- Institute of Chemistry and Technology of Macromolecular Materials
- Faculty of Chemical Technology
- University of Pardubice
- 53210 Pardubice
- Czech Republic
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8
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Sherbow TJ, Parsons LWT, Phan NA, Fettinger JC, Berben LA. Ligand Conjugation Directs the Formation of a 1,3-Dihydropyridinate Regioisomer. Inorg Chem 2020; 59:17614-17619. [PMID: 33215919 DOI: 10.1021/acs.inorgchem.0c02847] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The selective formation of the 1,4-dihydropyridine isomer of NAD(P)H is mirrored by the selective formation of 1,4-dihydropyridinate ligand-metal complexes in synthetic systems. Here we demonstrate that ligand conjugation can be used to promote selective 1,3-dihydropyridinate formation. This represents an advance toward controlling and tuning the selectivity in dihydropyridinate formation chemistry. The reaction of (I2P2-)Al(THF)Cl [1; I2P = bis(imino)pyridine; THF = tetrahydrofuran] with the one-electron oxidant (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) afforded (I2P-)Al(TEMPO)Cl (2), which can be reduced with sodium to the twice-reduced ligand complex (I2P2-)Al(TEMPO) (3). Compounds 2 and 3 serve as precursors for high-yielding and selective routes to an aluminum-supported 1,3-dihydropyridinate complex via the reaction of 2 with 3 equiv of potassium metal or the reaction of 3 with KH.
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Affiliation(s)
- Tobias J Sherbow
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Leo W T Parsons
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Nathan A Phan
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - James C Fettinger
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Louise A Berben
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
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9
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Kiernicki JJ, Zeller M, Szymczak NK. Examining the Generality of Metal-Ligand Cooperativity Across a Series of First-Row Transition Metals: Capture, Bond Activation, and Stabilization. Inorg Chem 2020; 59:9279-9286. [PMID: 32551605 DOI: 10.1021/acs.inorgchem.0c01163] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We outline the generality and requirements for cooperative N2H4 capture, N-N bond scission, and amido stabilization across a series of first-row transition metal complexes bearing a pyridine(dipyrazole) ligand. This ligand contains a pair of flexibly tethered trialkylborane Lewis acids that enable hydrazine capture and M-NH2 stabilization. While the Lewis acids are required to bind N2H4, the identity of the metal dictates whether N-N bond scission can occur. The redox properties of the M(II) bis(amidoborane) series of complexes were investigated and reveal that ligand-based events prevail; oxidation results in the generation of a transiently formed aminyl radical, while reduction occurs at the redox-active pyridine(dipyrazole) ligand.
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Affiliation(s)
- John J Kiernicki
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Matthias Zeller
- H. C. Brown Laboratory, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Nathaniel K Szymczak
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
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10
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Dawkins MJC, Simonov AN, Jones C. 2,6-Diiminopyridine complexes of group 2 metals: synthesis, characterisation and redox behaviour. Dalton Trans 2020; 49:6627-6634. [PMID: 32363367 DOI: 10.1039/d0dt01278e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Treatment of the 2,6-diiminopyridine, NC5H3{C(Ph)[double bond, length as m-dash]N(Dip)}2-2,6 (PhDimpy, Dip = 2,6-diisopropylphenyl) with [MgI2(OEt2)2] gives the adduct complex [(PhDimpy)MgI2] in which the PhDimpy ligand is neutral. This complex can be singly reduced by KC8 or a magnesium(i) complex to give [(PhDimpy˙)MgI], in which PhDimpy acts as a radical anion. Double reduction of [(PhDimpy)MgI2] in diethyl ether yields [(PhDimpy)Mg(OEt2)], in which the magnesium centre is ligated by dianionic [PhDimpy]2-. [(PhDimpy)Mg(OEt2)] can alternatively be prepared by the simple, high yielding reaction between PhDimpy and activated magnesium. A comproportionation reaction occurs between [(PhDimpy)MgI2] and [(PhDimpy)Mg(OEt2)], leading to the quantitative formation of [(PhDimpy˙)MgI]. The heavier group 2 metal dimeric complexes [{(PhDimpy)M}2] (M = Ca, Sr, Ba) can be similarly accessed by reaction of PhDimpy with the activated metal, or by KC8 reduction of in situ generated [(PhDimpy)MI2] (M = Ca, Sr). All prepared complexes have been characterised by X-ray crystallography and NMR spectroscopy. Electrochemical investigations into the complexes incorporating [PhDimpy]2- ligands reveal that they can undergo quasi-reversible 1- and 2-electron reduction processes, quasi-reversible 1-electron oxidations, and largely irreversible 2-electron oxidation events. These studies suggest that the compounds hold promise as soluble reducing agents in organic and inorganic synthesis.
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Affiliation(s)
| | - Alexandr N Simonov
- School of Chemistry, PO Box 23, Monash University, VIC 3800, Australia. and ARC Centre for Electromaterials Science, Monash University, VIC 3800, Australia
| | - Cameron Jones
- School of Chemistry, PO Box 23, Monash University, VIC 3800, Australia.
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11
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Ingale P, Knemeyer K, Piernavieja Hermida M, Naumann d’Alnoncourt R, Thomas A, Rosowski F. Atomic Layer Deposition of ZnO on Mesoporous Silica: Insights into Growth Behavior of ZnO via In-Situ Thermogravimetric Analysis. NANOMATERIALS 2020; 10:nano10050981. [PMID: 32443853 PMCID: PMC7279530 DOI: 10.3390/nano10050981] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 05/15/2020] [Accepted: 05/19/2020] [Indexed: 11/16/2022]
Abstract
ZnO is a remarkable material with many applications in electronics and catalysis. Atomic layer deposition (ALD) of ZnO on flat substrates is an industrially applied and well-known process. Various studies describe the growth of ZnO layers on flat substrates. However, the growth characteristics and reaction mechanisms of atomic layer deposition of ZnO on mesoporous powders have not been well studied. This study investigates the ZnO ALD process based on diethylzinc (DEZn) and water with silica powder as substrate. In-situ thermogravimetric analysis gives direct access to the growth rates and reaction mechanisms of this process. Ex-situ analytics, e.g., N2 sorption analysis, XRD, XRF, HRTEM, and STEM-EDX mapping, confirm deposition of homogenous and thin films of ZnO on SiO2. In summary, this study offers new insights into the fundamentals of an ALD process on high surface area powders.
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Affiliation(s)
- Piyush Ingale
- BasCat—UniCat BASF JointLab, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany; (P.I.); (K.K.); (M.P.H.); (F.R.)
| | - Kristian Knemeyer
- BasCat—UniCat BASF JointLab, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany; (P.I.); (K.K.); (M.P.H.); (F.R.)
| | - Mar Piernavieja Hermida
- BasCat—UniCat BASF JointLab, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany; (P.I.); (K.K.); (M.P.H.); (F.R.)
| | - Raoul Naumann d’Alnoncourt
- BasCat—UniCat BASF JointLab, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany; (P.I.); (K.K.); (M.P.H.); (F.R.)
- Correspondence:
| | - Arne Thomas
- Institut für Chemie, Technische Universität Berlin, 10623 Berlin, Germany;
| | - Frank Rosowski
- BasCat—UniCat BASF JointLab, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany; (P.I.); (K.K.); (M.P.H.); (F.R.)
- Process Research and Chemical Engineering, BASF SE, 67056 Ludwigshafen, Germany
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12
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Patil SG, Jadhav JS, Sankpal ST. Mg 3N 2-assisted one-pot synthesis of 1,3-disubstituted imidazo[1,5- a]pyridine. RSC Adv 2020; 10:11808-11815. [PMID: 35496590 PMCID: PMC9050600 DOI: 10.1039/c9ra10848c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Accepted: 03/03/2020] [Indexed: 11/21/2022] Open
Abstract
A novel Mg3N2-assisted one-pot annulation strategy has been developed via cyclo-condensation reaction of 2-pyridyl ketones with alkyl glyoxylates or aldehydes, allowing the formation of imidazo[1,5-a]pyridines exclusively with an exellent yield.
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Affiliation(s)
- Suhas G Patil
- Sant Rawool Maharaj Mahavidyalaya Kudal 416520 MS India.,Department of Chemistry, ASP College Devrukh Ratnagiri 415804 MS India +91 2354 260 058
| | | | - Sagar T Sankpal
- Department of Chemistry, ASP College Devrukh Ratnagiri 415804 MS India +91 2354 260 058
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13
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Zhang G, Wu J, Zheng S, Neary MC, Mao J, Flores M, Trovitch RJ, Dub PA. Redox-Noninnocent Ligand-Supported Vanadium Catalysts for the Chemoselective Reduction of C═X (X = O, N) Functionalities. J Am Chem Soc 2019; 141:15230-15239. [DOI: 10.1021/jacs.9b07062] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Guoqi Zhang
- Department of Sciences, John Jay College and PhD in Chemistry Program, The Graduate Center of City University of New York, New York, New York 10019, United States
| | - Jing Wu
- Department of Sciences, John Jay College and PhD in Chemistry Program, The Graduate Center of City University of New York, New York, New York 10019, United States
- Department of Chemistry, Hunter College, City University of New York, New York, New York 10065, United States
| | - Shengping Zheng
- Department of Chemistry, Hunter College, City University of New York, New York, New York 10065, United States
| | - Michelle C. Neary
- Department of Chemistry, Hunter College, City University of New York, New York, New York 10065, United States
| | - Jincheng Mao
- State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, People’s Republic of China
| | - Marco Flores
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Ryan J. Trovitch
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Pavel A. Dub
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
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14
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Gallardo-Villagrán M, Vidal F, Palma P, Álvarez E, Chen EYX, Cámpora J, Rodríguez-Delgado A. Aluminium(iii) dialkyl 2,6-bisimino-4R-dihydropyridinates(-1): selective synthesis, structure and controlled dimerization. Dalton Trans 2019; 48:9104-9116. [PMID: 31166327 DOI: 10.1039/c9dt00847k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A family of stable and otherwise selectively unachievable 2,6-bisimino-4-R-1,4-dihydropyridinate aluminium (III) dialkyl complexes [AlR'2(4-R-iPrBIPH)] (R = Bn, Allyl; R' = Me, Et, iBu) have been synthesized, taking advantage of a method for the preparation of the corresponding 4-R-1,4-dihydropiridine precursors developed in our group. All the dihydropyrdinate(-1) dialkyl aluminium complexes have been fully characterized by 1H- 13C-NMR, elemental analysis and in the case 2'a, also by X-ray diffraction studies. Upon heating in toluene solution at 110 °C, the dimethyl derivatives 2a and 2'a dimerize selectively through a double cycloaddition. This reaction leads to the formation of two new C-C bonds that involve the both meta positions of the two 4-R-1,4-dihydropyridinate fragments, resulting the binuclear aluminium species [Me2Al(4-R-iPrHBIP)]2 (R = Bn (3a); allyl (3'a)). Experimental kinetics showed that the dimerization of 2'a obeys second order rate with negative activation entropy, which is consistent with a bimolecular rate-determining step. Controlled methanolysis of both 3a and 3'a release the metal-free dimeric bases, (4-Bn-iPrHBIPH)2 and (4-allyl-iPrHBIPH)2, providing a convenient route to these potentially useful ditopic ligands. When the R' groups are bulkier than Me (2b, 2'b and 2'c), the dimerization is hindered or fully disabled, favoring the formation of paramagnetic NMR-silent species, which have been identified on the basis of a controlled methanolysis of the final organometallic products. Thus, when a toluene solution of [AlEt2(4-Bn-iPrBIPH)] (2b) was heated at 110 °C, followed by the addition of methanol in excess, it yields a mixture of the dimer (4-Bn-iPrHBIPH)2 and the aromatized base 4-Bn-iPrBIP, in ca. 1 : 2 ratio, indicating that the dimerization of 2b competes with its spontaneous dehydrogenation, yielding a paramagnetic complex containing a AlEt2 unit and a non-innocent (4-Bn-iPrBIP)˙- radical-anion ligand. Similar NMR monitoring experiments on the thermal behavior of [AlEt2(4-allyl-iPrBIPH)] (2'b) and [AliBu2(4-allyl-iPrBIPH)] (2'c) showed that these complexes do not dimerize, but afford exclusively NMR silent products. When such thermally treated samples were subjected to methanolysis, they resulted in mixtures of the alkylated 4-allyl-iPrBIP and non-alkylated iPrBIP ligand, suggesting that dehydrogenation and deallylation reactions take place competitively.
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Affiliation(s)
- Manuel Gallardo-Villagrán
- Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla, c/Américo Vespucio, 49, 41092, Sevilla, Spain.
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15
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Rahimi N, Herbert DE, Budzelaar PHM. Double and Reversible Alkyl Transfer from ZrBn
4
/HfBn
4
to a Diiminepyridine Ligand. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801304] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Naser Rahimi
- Department of Chemistry University of Manitoba 144 Dysart Road R3T 2N2 Winnipeg MB Canada
| | - David E. Herbert
- Department of Chemistry University of Manitoba 144 Dysart Road R3T 2N2 Winnipeg MB Canada
| | - Peter H. M. Budzelaar
- Department of Chemistry University of Manitoba 144 Dysart Road R3T 2N2 Winnipeg MB Canada
- Dipartimento di Scienze Chimiche Università di Napoli Federico II Via Cintia 4 80126 Napoli Italia
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16
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Zhang G, Wu J, Zeng H, Neary MC, Devany M, Zheng S, Dub PA. Dearomatization and Functionalization of Terpyridine Ligands Leading to Unprecedented Zwitterionic Meisenheimer Aluminum Complexes and Their Use in Catalytic Hydroboration. ACS Catal 2018. [DOI: 10.1021/acscatal.8b04096] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Guoqi Zhang
- Department of Sciences, John Jay College and PhD in Chemistry Program, The Graduate Center of City University of New York, New York, New York 10019, United States
| | - Jing Wu
- Department of Sciences, John Jay College and PhD in Chemistry Program, The Graduate Center of City University of New York, New York, New York 10019, United States
- Department of Chemistry, Hunter College, City University of New York, New York, New York 10065, United States
| | - Haisu Zeng
- Department of Sciences, John Jay College and PhD in Chemistry Program, The Graduate Center of City University of New York, New York, New York 10019, United States
- Department of Chemistry, Hunter College, City University of New York, New York, New York 10065, United States
| | - Michelle C. Neary
- Department of Chemistry, Hunter College, City University of New York, New York, New York 10065, United States
| | - Matthew Devany
- Department of Chemistry, Hunter College, City University of New York, New York, New York 10065, United States
| | - Shengping Zheng
- Department of Chemistry, Hunter College, City University of New York, New York, New York 10065, United States
| | - Pavel A. Dub
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
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17
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Wang H, Guo Z, Yang J, Cao W, Hua Y, Wei X, Li J. Synthesis and X-ray Crystal Structures of Zinc Complexes Supported by Chelating Ligands: Various Reactions of α-Iminopyridines with ZnEt 2. Z Anorg Allg Chem 2018. [DOI: 10.1002/zaac.201800120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Haimang Wang
- School of Chemistry and Chemical Engineering; Shanxi University; 030006 Taiyuan P. R. China
- College of Materials Science and Optoelectronic Technology; University of Chinese Academy of Sciences; 101408 Yanqi Lake Huairou District, Beijing P. R. China
| | - Zhiqiang Guo
- Scientific Instrument Center; Shanxi University; Taiyuan
| | - Jihong Yang
- School of Chemistry and Chemical Engineering; Shanxi University; 030006 Taiyuan P. R. China
| | - Wei Cao
- Scientific Instrument Center; Shanxi University; Taiyuan
| | - Yupeng Hua
- School of Chemistry and Chemical Engineering; Shanxi University; 030006 Taiyuan P. R. China
- Ordos Institute of Technology; 017000 Ordos Inner Mongolia P. R. China
| | - Xuehong Wei
- School of Chemistry and Chemical Engineering; Shanxi University; 030006 Taiyuan P. R. China
- Scientific Instrument Center; Shanxi University; Taiyuan
| | - Jianfeng Li
- College of Materials Science and Optoelectronic Technology; University of Chinese Academy of Sciences; 101408 Yanqi Lake Huairou District, Beijing P. R. China
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18
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Sandoval JJ, Álvarez E, Palma P, Rodríguez-Delgado A, Cámpora J. Neutral Bis(imino)-1,4-dihydropyridinate and Cationic Bis(imino)pyridine σ-Alkylzinc(II) Complexes as Hydride Exchange Systems: Classic Organometallic Chemistry Meets Ligand-Centered, Biomimetic Reactivity. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00183] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John J. Sandoval
- Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla. c/Américo Vespucio, 49, 41092 Sevilla, Spain
| | - Eleuterio Álvarez
- Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla. c/Américo Vespucio, 49, 41092 Sevilla, Spain
| | - Pilar Palma
- Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla. c/Américo Vespucio, 49, 41092 Sevilla, Spain
| | - Antonio Rodríguez-Delgado
- Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla. c/Américo Vespucio, 49, 41092 Sevilla, Spain
| | - Juan Cámpora
- Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla. c/Américo Vespucio, 49, 41092 Sevilla, Spain
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