1
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Kimball JJ, Altenhof AR, Jaroszewicz MJ, Schurko RW. Broadband Cross-Polarization to Half-Integer Quadrupolar Nuclei: Wideline Static NMR Spectroscopy. J Phys Chem A 2023; 127:9621-9634. [PMID: 37922436 DOI: 10.1021/acs.jpca.3c05447] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2023]
Abstract
Cross-polarization (CP) is a technique commonly used for the signal enhancement of NMR spectra; however, applications to quadrupolar nuclei have heretofore been limited due to a number of problems, including poor spin-locking efficiency, inconvenient relaxation times, and reduced CP efficiencies over broad spectral bandwidths─this is unfortunate, since they constitute 73% of NMR-active nuclei in the periodic table. The Broadband Adiabatic Inversion CP (BRAIN-CP) pulse sequence has proven useful for the signal enhancement of wideline and ultra-wideline (i.e., 250 kHz to several MHz in breadth) powder patterns arising from stationary samples; however, a comprehensive investigation of its application to half-integer quadrupolar nuclei (HIQN) is currently lacking. Herein, we present theoretical and experimental considerations for applying BRAIN-CP to acquire central-transition (CT, +1/2 ↔ -1/2) powder patterns of HIQN. Consideration is given to parameters crucial to the success of the experiment, such as the Hartmann-Hahn (HH) matching conditions and the phase modulation of the contact pulse. Modifications to the BRAIN-CP sequence such as flip-back (FB) pulses and ramped contact pulses applied to the 1H spins are used for the reduction of experimental times and increased CP bandwidth capabilities, respectively. Spectra for a series of quadrupolar nuclei with broad CT powder patterns, including 35Cl (S = 3/2), 55Mn (S = 5/2), 59Co (S = 7/2), and 93Nb (S = 9/2), are acquired via direct excitation (CPMG and WCPMG) and indirect excitation (CP/CPMG and BRAIN-CP) methods. We demonstrate that proper implementation of the sequence can enable 1H-S broadband CP over a bandwidth of 1 MHz, which to the best of our knowledge is the largest CP bandwidth reported to date. Finally, we establish the basic principles necessary for simplified optimization and execution of the BRAIN-CP pulse sequence for a wide range of HIQNs.
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Affiliation(s)
- James J Kimball
- Department of Chemistry & Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Adam R Altenhof
- Department of Chemistry & Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Michael J Jaroszewicz
- Department of Chemical & Biological Physics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Robert W Schurko
- Department of Chemistry & Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
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2
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Griffith KJ, Ding F, Flynn S. Solid-state nuclear magnetic resonance of spin-9/2 nuclei 115 In and 209 Bi in functional inorganic complex oxides. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2021; 59:1077-1088. [PMID: 34081358 DOI: 10.1002/mrc.5183] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 05/24/2021] [Accepted: 05/29/2021] [Indexed: 05/02/2023]
Abstract
Indium and bismuth are technologically important elements, in particular as oxides for optoelectronic applications. 115 In and 209 Bi are both I = 9/2 nuclei with high natural abundances and moderately high frequencies but large nuclear electric quadrupole moments. Leveraging the quadrupolar interaction as a measure of local symmetry and polyhedral distortions for these nuclei could provide powerful insights on a range of applied materials. However, the absence of reported nuclear magnetic resonance (NMR) parameters on these nuclei, particularly in oxides, hinders their use by the broader materials community. In this contribution, solid-state 115 In and 209 Bi NMR of three recently discovered quaternary bismuth or indium oxides are reported, supported by density functional theory calculations, numerical simulations, diffraction and additional multinuclear (27 Al, 69,71 Ga, and 121 Sb) solid-state NMR measurements. The compounds LiIn2 SbO6 , BiAlTeO6 , and BiGaTeO6 are measured without special equipment at 9.4 T, demonstrating that wideline techniques such as the QCPMG pulse sequence and frequency-stepped acquisition can enable straightforward extraction of quadrupolar tensor information in I = 9/2 115 In and 209 Bi even in sites with large quadrupolar coupling constants. Relationships are described between the NMR observables and local site symmetry. These are amongst the first reports of the NMR parameters of 115 In, 121 Sb, and 209 Bi in oxides.
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Affiliation(s)
- Kent J Griffith
- Department of Chemistry, Northwestern University, Evanston, Illinois, USA
| | - Fenghua Ding
- Department of Chemistry, Northwestern University, Evanston, Illinois, USA
| | - Steven Flynn
- Department of Chemistry, Northwestern University, Evanston, Illinois, USA
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3
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Kobera L, Southern SA, Frost JM, Bryce DL. Multinuclear solid-state magnetic resonance study of oxo-bridged diniobium and quadruply-bonded dimolybdenum carboxylate clusters. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 84:20-27. [PMID: 27986401 DOI: 10.1016/j.ssnmr.2016.12.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 12/01/2016] [Accepted: 12/02/2016] [Indexed: 06/06/2023]
Abstract
Carboxylate paddlewheels and their oxo-bridged analogues constitute ideal building blocks for the assembly of two- and three-dimensional framework materials. Here, we present a multinuclear (1H, 13C, 93Nb, 95Mo) magnetic resonance study of solid samples of Nb2OCl6(O2Ph)2 (1), Mo2(O2CMe)4 (2), and Mo2(O2CCHF2)4 (3). High-resolution proton and 13C CP/MAS NMR spectra provide valuable information on structure and crystal symmetry and on cocrystallized solvent. 93Nb solid-state NMR spectra of 1 provide quadrupolar coupling constants and chemical shift tensors which are characteristic of the axially asymmetric Nb-O-Nb bridging environment. 95Mo solid-state NMR spectra of 2 and 3 provide quadrupolar coupling constants and chemical shift tensors which are directly characteristic of the molybdenum-molybdenum quadruple bonds in these compounds. The quadruple bonds are characterized by particularly large 95Mo chemical shift tensor spans on the order of 5500ppm. Density functional theoretical computations provide good agreement with the 93Nb and 95Mo experimental data, with some exceptions noted. This work demonstrates possible NMR approaches to characterize more complex framework materials and provides key insight into the Mo-Mo quadruple bond.
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Affiliation(s)
- Libor Kobera
- Department of Chemistry and Biomolecular Sciences&Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie Private, Ottawa, Ontario K1N6N5, Canada
| | - Scott A Southern
- Department of Chemistry and Biomolecular Sciences&Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie Private, Ottawa, Ontario K1N6N5, Canada
| | - Jamie M Frost
- Department of Chemistry and Biomolecular Sciences&Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie Private, Ottawa, Ontario K1N6N5, Canada
| | - David L Bryce
- Department of Chemistry and Biomolecular Sciences&Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie Private, Ottawa, Ontario K1N6N5, Canada.
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4
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Healy C, Twamley B, Venkatesan M, Schmidt S, Gunnlaugsson T, Schmitt W. Hetero-metallic, functionalizable polyoxomolybdate clusters via a “top-down” synthetic method. Chem Commun (Camb) 2017; 53:10660-10663. [DOI: 10.1039/c7cc05498j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two bi-metallic, organophosphonate-stabilised sandwich-type polyoxomolybdate clusters, [Mo6Cu4O16(OH)2(C4H9PO3)4(C5H5N)2(CH3O)4(H2O)]2−and [Mo7Cu7O19(OH)(CH3O)7(C4H9PO3)6(C5H5N)2]2−, are reported.
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Affiliation(s)
- Colm Healy
- School of Chemistry & CRANN Institute
- University of Dublin
- Trinity College
- Dublin 2
- Ireland
| | - Brendan Twamley
- School of Chemistry & CRANN Institute
- University of Dublin
- Trinity College
- Dublin 2
- Ireland
| | - Munuswamy Venkatesan
- School of Physics & CRANN Institute
- University of Dublin
- Trinity College
- Dublin 2
- Ireland
| | - Sebastian Schmidt
- Institut für Anorganische Chemie
- Karlsruhe Institute of Technology (KIT)
- Karlsruhe
- Germany
| | - Thorfinnur Gunnlaugsson
- School of Chemistry & Trinity Biomedical Sciences Institute (TBSI)
- Trinity College Dublin
- University of Dublin
- Dublin 2
- Ireland
| | - Wolfgang Schmitt
- School of Chemistry & CRANN Institute
- University of Dublin
- Trinity College
- Dublin 2
- Ireland
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5
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D’Elia V, Dong H, Rossini AJ, Widdifield CM, Vummaleti SVC, Minenkov Y, Poater A, Abou-Hamad E, Pelletier JDA, Cavallo L, Emsley L, Basset JM. Cooperative Effect of Monopodal Silica-Supported Niobium Complex Pairs Enhancing Catalytic Cyclic Carbonate Production. J Am Chem Soc 2015; 137:7728-39. [DOI: 10.1021/jacs.5b02872] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Valerio D’Elia
- KAUST
Catalysis Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Hailin Dong
- KAUST
Catalysis Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Aaron J. Rossini
- Centre
de RMN à Très Hauts Champs (CNRS/ENS-Lyon/UCB Lyon 1), Université de Lyon, 5 rue de la Doua, 69100 Villeurbanne, France
| | - Cory M. Widdifield
- Centre
de RMN à Très Hauts Champs (CNRS/ENS-Lyon/UCB Lyon 1), Université de Lyon, 5 rue de la Doua, 69100 Villeurbanne, France
| | - Sai V. C. Vummaleti
- KAUST
Catalysis Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Yury Minenkov
- KAUST
Catalysis Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Albert Poater
- KAUST
Catalysis Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
- Institut
de Química Computacional, Department de Química, Universitat de Girona, Campus de Montilivi, E-17071 Girona, Spain
| | - Edy Abou-Hamad
- KAUST
Catalysis Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Jérémie D. A. Pelletier
- KAUST
Catalysis Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Luigi Cavallo
- KAUST
Catalysis Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Lyndon Emsley
- Centre
de RMN à Très Hauts Champs (CNRS/ENS-Lyon/UCB Lyon 1), Université de Lyon, 5 rue de la Doua, 69100 Villeurbanne, France
- Institut
des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Jean-Marie Basset
- KAUST
Catalysis Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
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6
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Tijssen KCH, Blaakmeer ESM, Kentgens APM. Solid-state NMR studies of Ziegler-Natta and metallocene catalysts. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 68-69:37-56. [PMID: 25957882 DOI: 10.1016/j.ssnmr.2015.04.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 03/30/2015] [Accepted: 04/02/2015] [Indexed: 06/04/2023]
Abstract
Ziegler-Natta catalysts are the workhorses of polyolefin production. However, although they have been used and intensively studied for half a century, there is still no comprehensive picture of their mechanistic operation. New techniques are needed to gain more insight in these catalysts. Solid-state NMR has reached a high level of sophistication over the last few decades and holds great promise for providing a deeper insight in Ziegler-Natta catalysis. This review outlines the possibilities for solid-state NMR to characterize the different components and interactions in Ziegler-Natta and metallocene catalysts. An overview is given of some of the expected mechanisms and the resulting polymer microstructure and other characteristics. In the second part of this review we present studies that have used solid-state NMR to investigate the composition of Ziegler-Natta and metallocene catalysts or the interactions between their components.
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Affiliation(s)
- Koen C H Tijssen
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, Nijmegen, The Netherlands.
| | - E S Merijn Blaakmeer
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, Nijmegen, The Netherlands.
| | - Arno P M Kentgens
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, Nijmegen, The Netherlands.
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7
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O’Keefe CA, Johnston KE, Sutter K, Autschbach J, Gauvin R, Trébosc J, Delevoye L, Popoff N, Taoufik M, Oudatchin K, Schurko RW. An Investigation of Chlorine Ligands in Transition-Metal Complexes via 35Cl Solid-State NMR and Density Functional Theory Calculations. Inorg Chem 2014; 53:9581-97. [DOI: 10.1021/ic501004u] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Christopher A. O’Keefe
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario N9B 3P4, Canada
| | - Karen E. Johnston
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario N9B 3P4, Canada
| | - Kiplangat Sutter
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States
| | - Jochen Autschbach
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States
| | - Régis Gauvin
- Université
Lille Nord de France, CNRS UMR8181, Unité de Catalyse et de
Chimie du Solide, UCCS USTL, F-59655 Villeneuve d’Ascq, France
| | - Julien Trébosc
- Université
Lille Nord de France, CNRS UMR8181, Unité de Catalyse et de
Chimie du Solide, UCCS USTL, F-59655 Villeneuve d’Ascq, France
| | - Laurent Delevoye
- Université
Lille Nord de France, CNRS UMR8181, Unité de Catalyse et de
Chimie du Solide, UCCS USTL, F-59655 Villeneuve d’Ascq, France
| | - Nicolas Popoff
- Laboratoire
de Chimie, Catalyse, Polymères et Procédés (UMR-C2P2-5265
CNRS/ESCPE-Lyon/UCBL) ESCPE Lyon, F-308-43, Boulevard du 11 Novembre 1918, F-69616 Villeurbanne Cedex, France
| | - Mostafa Taoufik
- Laboratoire
de Chimie, Catalyse, Polymères et Procédés (UMR-C2P2-5265
CNRS/ESCPE-Lyon/UCBL) ESCPE Lyon, F-308-43, Boulevard du 11 Novembre 1918, F-69616 Villeurbanne Cedex, France
| | - Konstantin Oudatchin
- Steacie Institute for
Molecular Sciences, National Research Council, 100 Sussex Drive, Ottawa, Ontario K1A OR6, Canada
| | - Robert W. Schurko
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario N9B 3P4, Canada
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8
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Corzilius B, Michaelis VK, Penzel SA, Ravera E, Smith AA, Luchinat C, Griffin RG. Dynamic nuclear polarization of (1)H, (13)C, and (59)Co in a tris(ethylenediamine)cobalt(III) crystalline lattice doped with Cr(III). J Am Chem Soc 2014; 136:11716-27. [PMID: 25069794 PMCID: PMC4140501 DOI: 10.1021/ja5044374] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The study of inorganic crystalline materials by solid-state NMR spectroscopy is often complicated by the low sensitivity of heavy nuclei. However, these materials often contain or can be prepared with paramagnetic dopants without significantly affecting the structure of the crystalline host. Dynamic nuclear polarization (DNP) is generally capable of enhancing NMR signals by transferring the magnetization of unpaired electrons to the nuclei. Therefore, the NMR sensitivity in these paramagnetically doped crystals might be increased by DNP. In this paper we demonstrate the possibility of efficient DNP transfer in polycrystalline samples of [Co(en)3Cl3]2·NaCl·6H2O (en = ethylenediamine, C2H8N2) doped with Cr(III) in varying concentrations between 0.1 and 3 mol %. We demonstrate that (1)H, (13)C, and (59)Co can be polarized by irradiation of Cr(III) with 140 GHz microwaves at a magnetic field of 5 T. We further explain our findings on the basis of electron paramagnetic resonance spectroscopy of the Cr(III) site and analysis of its temperature-dependent zero-field splitting, as well as the dependence of the DNP enhancement factor on the external magnetic field and microwave power. This first demonstration of DNP transfer from one paramagnetic metal ion to its diamagnetic host metal ion will pave the way for future applications of DNP in paramagnetically doped materials or metalloproteins.
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Affiliation(s)
- Björn Corzilius
- Francis Bitter Magnet Laboratory and Department of Chemistry, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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9
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Hanson MA, Terskikh VV, Baines KM, Huang Y. Chlorine-35 Solid-State NMR Spectroscopy as an Indirect Probe of Germanium Oxidation State and Coordination Environment in Germanium Chlorides. Inorg Chem 2014; 53:7377-88. [DOI: 10.1021/ic500728w] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Margaret A. Hanson
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Victor V. Terskikh
- Department of Chemistry, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5
| | - Kim M. Baines
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Yining Huang
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
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10
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Bonhomme C, Gervais C, Laurencin D. Recent NMR developments applied to organic-inorganic materials. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2014; 77:1-48. [PMID: 24411829 DOI: 10.1016/j.pnmrs.2013.10.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 10/17/2013] [Indexed: 06/03/2023]
Abstract
In this contribution, the latest developments in solid state NMR are presented in the field of organic-inorganic (O/I) materials (or hybrid materials). Such materials involve mineral and organic (including polymeric and biological) components, and can exhibit complex O/I interfaces. Hybrids are currently a major topic of research in nanoscience, and solid state NMR is obviously a pertinent spectroscopic tool of investigation. Its versatility allows the detailed description of the structure and texture of such complex materials. The article is divided in two main parts: in the first one, recent NMR methodological/instrumental developments are presented in connection with hybrid materials. In the second part, an exhaustive overview of the major classes of O/I materials and their NMR characterization is presented.
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Affiliation(s)
- Christian Bonhomme
- Laboratoire de Chimie de la Matière Condensée de Paris, UMR CNRS 7574, Université Pierre et Marie Curie, Paris 06, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France.
| | - Christel Gervais
- Laboratoire de Chimie de la Matière Condensée de Paris, UMR CNRS 7574, Université Pierre et Marie Curie, Paris 06, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France
| | - Danielle Laurencin
- Institut Charles Gerhardt de Montpellier, UMR5253, CNRS UM2 UM1 ENSCM, CC1701, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France
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11
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Yamada K, Shimizu T, Nakai T, Deguchi K, Yue B, Ye J. Solid-state 93Nb NMR Study of Nitrogen-doped Lamellar Niobic Acid. CHEM LETT 2013. [DOI: 10.1246/cl.130516] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Kazuhiko Yamada
- Department of Chemistry and Materials Science, Graduate School of Science and Engineering, Tokyo Institute of Technology
| | | | | | | | - Bing Yue
- Department of Chemistry, Graduate School of Science, Hokkaido University
| | - Jinhua Ye
- International Center of Materials Nanoarchitectonics, National Institute of Materials Science
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12
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Johnston KE, O'Keefe CA, Gauvin RM, Trébosc J, Delevoye L, Amoureux JP, Popoff N, Taoufik M, Oudatchin K, Schurko RW. A Study of Transition-Metal Organometallic Complexes Combining35Cl Solid-State NMR Spectroscopy and35Cl NQR Spectroscopy and First-Principles DFT Calculations. Chemistry 2013; 19:12396-414. [DOI: 10.1002/chem.201301268] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Indexed: 11/10/2022]
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13
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Farooq H, Courtier-Murias D, Soong R, Masoom H, Maas W, Fey M, Kumar R, Monette M, Stronks H, Simpson MJ, Simpson AJ. Rapid parameter optimization of low signal-to-noise samples in NMR spectroscopy using rapid CPMG pulsing during acquisition: application to recycle delays. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2013; 51:129-135. [PMID: 23322645 DOI: 10.1002/mrc.3923] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Revised: 12/11/2012] [Accepted: 12/16/2012] [Indexed: 06/01/2023]
Abstract
A method is presented that combines Carr-Purcell-Meiboom-Gill (CPMG) during acquisition with either selective or nonselective excitation to produce a considerable intensity enhancement and a simultaneous loss in chemical shift information. A range of parameters can theoretically be optimized very rapidly on the basis of the signal from the entire sample (hard excitation) or spectral subregion (soft excitation) and should prove useful for biological, environmental, and polymer samples that often exhibit highly dispersed and broad spectral profiles. To demonstrate the concept, we focus on the application of our method to T(1) determination, specifically for the slowest relaxing components in a sample, which ultimately determines the optimal recycle delay in quantitative NMR. The traditional inversion recovery (IR) pulse program is combined with a CPMG sequence during acquisition. The slowest relaxing components are selected with a shaped pulse, and then, low-power CPMG echoes are applied during acquisition with intervals shorter than chemical shift evolution (RCPMG) thus producing a single peak with an SNR commensurate with the sum of the signal integrals in the selected region. A traditional (13)C IR experiment is compared with the selective (13)C IR-RCPMG sequence and yields the same T(1) values for samples of lysozyme and riverine dissolved organic matter within error. For lysozyme, the RCPMG approach is ~70 times faster, and in the case of dissolved organic matter is over 600 times faster. This approach can be adapted for the optimization of a host of parameters where chemical shift information is not necessary, such as cross-polarization/mixing times and pulse lengths.
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Affiliation(s)
- Hashim Farooq
- Department of Chemistry, University of Toronto, 1265 Military Trail, Toronto, ON, Canada, M1C 1A4
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14
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Diana E, Chierotti MR, Marchese EMC, Croce G, Milanesio M, Stanghellini PL. Blue and red shift hydrogen bonds in crystalline cobaltocinium complexes. NEW J CHEM 2012. [DOI: 10.1039/c2nj20760e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Rossini AJ, Hung I, Johnson SA, Slebodnick C, Mensch M, Deck PA, Schurko RW. Solid-State 91Zr NMR Spectroscopy Studies of Zirconocene Olefin Polymerization Catalyst Precursors. J Am Chem Soc 2010; 132:18301-17. [DOI: 10.1021/ja107749b] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Aaron J. Rossini
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0121, United States
| | - Ivan Hung
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0121, United States
| | - Samuel A. Johnson
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0121, United States
| | - Carla Slebodnick
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0121, United States
| | - Mike Mensch
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0121, United States
| | - Paul A. Deck
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0121, United States
| | - Robert W. Schurko
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0121, United States
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16
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Bühl M, Wrackmeyer B. Density-functional computation of ⁹³Nb NMR chemical shifts. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2010; 48 Suppl 1:S61-S68. [PMID: 20552575 DOI: 10.1002/mrc.2624] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
93Nb chemical shifts of [NbX6](-) (X = Cl, F, CO), [NbXCl4](-) (X = O, S), Nb2(OMe)10, Cp*2Nb(κ2-BH4), (Cp*Nb)2(µ-B2H6)2, CpNb(CO)4, and Cp2NbH3 are computed at the GIAO (gauge-including atomic orbitals)-, BPW91- and B3LYP-, and CSGT (continuous set of gauge transformations)-CAM-B3LYP, -ωB97, and -ωB97X levels, using BP86-optimized or experimental (X-ray) geometries. Experimental chemical shifts are best reproduced at the GIAO-BPW91 level when δ(93Nb) values of inorganic complexes are referenced directly relative to [NbCl6](-) and those of organometallic species are first calculated relative to [Nb(CO)6](-). An inadvertent error in the reported δ(93Nb) values of cyclopentadiene borane complexes (H. Brunner et al., J. Organomet. Chem.1992, 436, 313) is corrected. Trends in the observed 93Nb NMR linewidths for anionic niobates [Nb(CO)5](3-), [Nb(CO)5H](2-), and [Nb(CO)5(NH3)](-) are rationalized in terms of computed electric field gradients at the metal.
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Affiliation(s)
- Michael Bühl
- School of Chemistry, North Haugh, University of St Andrews, St Andrews, Fife KY16 9ST, UK.
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Aquino F, Govind N, Autschbach J. Electric Field Gradients Calculated from Two-Component Hybrid Density Functional Theory Including Spin−Orbit Coupling. J Chem Theory Comput 2010; 6:2669-86. [DOI: 10.1021/ct1002847] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fredy Aquino
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, and William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O. Box 999, Mail Stop K8-91 Richland, Washington 99352
| | - Niranjan Govind
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, and William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O. Box 999, Mail Stop K8-91 Richland, Washington 99352
| | - Jochen Autschbach
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, and William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O. Box 999, Mail Stop K8-91 Richland, Washington 99352
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18
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Hung I, Gan Z. On the practical aspects of recording wideline QCPMG NMR spectra. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2010; 204:256-265. [PMID: 20359918 DOI: 10.1016/j.jmr.2010.03.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2010] [Revised: 03/02/2010] [Accepted: 03/02/2010] [Indexed: 05/29/2023]
Abstract
The practical aspects of applying CPMG for acquisition of wideline powder patterns are examined. It is shown that most distortions/modulations of spikelet spectra can be traced to the incoherent signal averaging from multiple coherence transfer pathways. A strategy for minimizing these distortions/modulations is described. Also, a few interesting observations regarding the implementation of the wideline WURST-QCPMG experiment are presented, namely the accumulation of second-order signal phase and the effects of varying the sweep rate and rf field of chirp pulses.
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Affiliation(s)
- Ivan Hung
- Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 32310, USA
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Hanna J, Pike K, Charpentier T, Kemp T, Smith M, Lucier B, Schurko R, Cahill L. A93Nb Solid-State NMR and Density Functional Theory Study of Four- and Six-Coordinate Niobate Systems. Chemistry 2010; 16:3222-39. [DOI: 10.1002/chem.200901581] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Zhu J, Huang Y. Solid-State NMR Study of Dehydration of Layered α-Niobium Phosphate. Inorg Chem 2009; 48:10186-92. [DOI: 10.1021/ic9011668] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jianfeng Zhu
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Yining Huang
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
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21
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Chierotti MR, Gobetto R. Solid‐State NMR Investigation of Ligand Mobility and Reactivity in Transition Metal Complexes. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200801205] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Michele R. Chierotti
- Dipartimento di Chimica I.F.M., Università di Torino, via P. Giuria 7, 10125 Torino, Italy, Fax: +39‐011‐6707855
| | - Roberto Gobetto
- Dipartimento di Chimica I.F.M., Università di Torino, via P. Giuria 7, 10125 Torino, Italy, Fax: +39‐011‐6707855
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22
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Rossini AJ, Mills RW, Briscoe GA, Norton EL, Geier SJ, Hung I, Zheng S, Autschbach J, Schurko RW. Solid-State Chlorine NMR of Group IV Transition Metal Organometallic Complexes. J Am Chem Soc 2009; 131:3317-30. [DOI: 10.1021/ja808390a] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Aaron J. Rossini
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Ryan W. Mills
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Graham A. Briscoe
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Erin L. Norton
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Stephen J. Geier
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Ivan Hung
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Shaohui Zheng
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Jochen Autschbach
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Robert W. Schurko
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
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Tang JA, Ellis BD, Warren TH, Hanna JV, Macdonald CLB, Schurko RW. Solid-State 63Cu and 65Cu NMR Spectroscopy of Inorganic and Organometallic Copper(I) Complexes. J Am Chem Soc 2007; 129:13049-65. [DOI: 10.1021/ja073238x] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joel A. Tang
- Contribution from the Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, Department of Chemistry, Georgetown University, P.O Box 571227, Washington, D.C. 20057-1227, and ANSTO NMR Facility, Materials Division, Australian Nuclear Science and Technology Organisation, Sydney, Australia, NSW, 2234
| | - Bobby D. Ellis
- Contribution from the Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, Department of Chemistry, Georgetown University, P.O Box 571227, Washington, D.C. 20057-1227, and ANSTO NMR Facility, Materials Division, Australian Nuclear Science and Technology Organisation, Sydney, Australia, NSW, 2234
| | - Timothy H. Warren
- Contribution from the Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, Department of Chemistry, Georgetown University, P.O Box 571227, Washington, D.C. 20057-1227, and ANSTO NMR Facility, Materials Division, Australian Nuclear Science and Technology Organisation, Sydney, Australia, NSW, 2234
| | - John V. Hanna
- Contribution from the Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, Department of Chemistry, Georgetown University, P.O Box 571227, Washington, D.C. 20057-1227, and ANSTO NMR Facility, Materials Division, Australian Nuclear Science and Technology Organisation, Sydney, Australia, NSW, 2234
| | - Charles L. B. Macdonald
- Contribution from the Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, Department of Chemistry, Georgetown University, P.O Box 571227, Washington, D.C. 20057-1227, and ANSTO NMR Facility, Materials Division, Australian Nuclear Science and Technology Organisation, Sydney, Australia, NSW, 2234
| | - Robert W. Schurko
- Contribution from the Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, Department of Chemistry, Georgetown University, P.O Box 571227, Washington, D.C. 20057-1227, and ANSTO NMR Facility, Materials Division, Australian Nuclear Science and Technology Organisation, Sydney, Australia, NSW, 2234
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Flambard A, Montagne L, Delevoye L, Steuernagel S. 93Nb and 17O NMR chemical shifts of niobiophosphate compounds. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2007; 32:34-43. [PMID: 17728114 DOI: 10.1016/j.ssnmr.2007.07.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2007] [Accepted: 07/05/2007] [Indexed: 05/17/2023]
Abstract
Niobiophosphate compounds with a large range of niobium and oxygen environments were studied with (93)Nb and (17)O solid-state NMR. (93)Nb isotropic chemical shift of pure niobate Nb(ONb)(6), pure phosphate Nb(OP)(6) and mixed phosphate-niobate Nb(OP)(x)(ONb)((6-x)) (1<or= x<or=5) sites were measured at a high magnetic field (18.8T). (93)Nb chemical shifts were found to be sensitive to the variation of local charge on Nb, but not to the local bond geometry (i.e. crystallographic site and edge or corner connectivity). A systematic shift to high field of the (93)Nb chemical shift is measured when x increases. Then, (17)O NMR spectra of a series of enriched samples provided the chemical shift and quadrupolar parameters for 4 types of oxygen environment (P-O-P, P-O-Na, P-O-Nb and Nb-O-Nb). Finally, Nb-O-Nb sites were characterized by a large (17)O chemical shift anisotropy.
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Affiliation(s)
- A Flambard
- Unité de Catalyse et Chimie du Solide, UMR CNRS 8181, Ecole Nationale Supérieure de Chimie de Lille, Université des Sciences et Technologies de Lille, BP 108, 59652 Villeneuve d'Ascq Cedex, France
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Gee BA. Vanadium-51 solid-state NMR electric field gradient tensors: a DFT-embedded ion and isolated cluster study of crystalline vanadium oxides. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2006; 30:171-81. [PMID: 17023147 DOI: 10.1016/j.ssnmr.2006.08.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2006] [Revised: 08/22/2006] [Accepted: 08/31/2006] [Indexed: 05/12/2023]
Abstract
Density functional theory (DFT) calculations (6-311+G(2d,p)/B3LYP level of theory) of (51)V electric field gradient (EFG) tensor elements are performed for embedded and isolated cluster models of orthovanadates. The structural models used to calculate the EFGs of (51)V are (I) an isolated H(4)VO(4)(+) cluster, (II) an isolated H(n)VO(4)(n-3) cluster (n=number of next-neighbor cations) (III) an isolated orthovanadate anion, VO(4)(-x), and (IV) a VO(4)(-x) ion embedded in a finite point-charge array whose electrostatic potential, at the embedded ion, is equivalent to that of the infinite lattice. For models III and IV, a charge x is assigned estimating the covalence of the system. Models III and IV provide results in good agreement with the experiment. Calculations, employing the embedded and isolated VO(4)(-x) models, are used to discuss site assignments for AlVO(4). Correlations between quadrupole coupling parameters and deviations of the orthovanadate structure from ideal tetrahedral symmetry are shown.
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Affiliation(s)
- Becky A Gee
- Department of Chemistry and Biochemistry, 1 University Plaza, Long Island University, Brooklyn Campus, Brooklyn, NY 11201, USA.
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