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Insight into electronic and optical properties of Eu+2-doped CaTiO3 from GGA+U calculations. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2020.121796] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Irfan M, Kamran MA, Azam S, Iqbal MW, Alharbi T, Majid A, Omran SB, Khenata R, Bouhemadou A, Wang X. Electronic structure and optical properties of TaNO: An ab initio study. J Mol Graph Model 2019; 92:296-302. [PMID: 31430680 DOI: 10.1016/j.jmgm.2019.08.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Revised: 08/06/2019] [Accepted: 08/09/2019] [Indexed: 11/17/2022]
Abstract
We performed ab initio calculations to study the structural and optoelectronic properties of simple and slab phase TaNO using density functional theory (DFT), in which the full potential augmented plane wave (FP-LAPW) method was implemented using the computational code Wien 2k. The modified Becke-Johnson potential (mBJ-GGA) was used for these calculations. The calculated band structure and electronic properties revealed an indirect bandgap for simple TaNO (3.2 eV) and a direct bandgap for slab TaNO (1.5 eV). The interband electronic transitions were investigated from the band structure, and transition peaks were observed from the imaginary part of the dielectric function. These transitions are due to Ta-p, N-p and O-p orbitals for simple TaNO and Ta-p, N-s as well as O-p orbitals for slab TaNO. The plasmon energy was related to the main peak of the energy loss function, which was approximately 10 eV. The static value of the dielectric constant and the refraction were close to the experimental values. In general, slab TaNO shows different properties and is more suitable for optoelectronic applications due to direct bandgap.
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Affiliation(s)
- Muhammad Irfan
- Department of Physics, University of Sargodha, 40100, Sargodha, Pakistan
| | - Muhammad Arshad Kamran
- Department of Physics, College of Science, Majmaah University, Al-Majmaah, 11952, Saudi Arabia.
| | - Sikander Azam
- Faculty of Engineering and Applied Sciences, Department of Physics, RIPHAH International University I-14 Campus Islamabad, Pakistan.
| | - Muhammad Waqas Iqbal
- Riphah International University, Lahore Campus 14 - Civic Center, Near Hamdard Chowk, Township, Lahore, Pakistan
| | - Thamer Alharbi
- Department of Physics, College of Science, Majmaah University, Al-Majmaah, 11952, Saudi Arabia
| | - Abdul Majid
- Department of Physics, College of Science, Majmaah University, Al-Majmaah, 11952, Saudi Arabia
| | - S Bin Omran
- Department of Physics and Astronomy, College of Science, King Saud University, P.O.Box 2455, Riyadh, 11451, Saudi Arabia
| | - R Khenata
- Laboratoire de Physique Quantique de la Matière et de la Modélisation Mathématique (LPQ3M), Université de Mascara, Mascara, 29000, Algeria.
| | - A Bouhemadou
- Laboratory for Developing New Materials and their Characterization, University of Setif 1, 19000, Setif, Algeria
| | - Xiaotian Wang
- School of Physical Science and Technology, Southwest University, Chongqing, 400715, China.
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Gan Z, Hung I, Nishiyama Y, Amoureux JP, Lafon O, Nagashima H, Trébosc J, Hu B. 14N overtone nuclear magnetic resonance of rotating solids. J Chem Phys 2018; 149:064201. [PMID: 30111134 PMCID: PMC8808743 DOI: 10.1063/1.5044653] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Accepted: 07/17/2018] [Indexed: 11/14/2022] Open
Abstract
By irradiating and observing at twice the 14N Larmor frequency, overtone (OT) nuclear magnetic resonance (NMR) is capable of obtaining 14NOT spectra without first-order quadrupolar broadening. Direct excitation and detection of the usually "forbidden" double-quantum transition is mediated by the perturbation from the large quadrupole interaction to the spin states quantized by the Zeeman interaction. A recent study [L. A. O'Dell and C. I. Ratcliffe, Chem. Phys. Lett. 514, 168 (2011)] has shown that 14NOT NMR under magic-angle spinning (MAS) can yield high-resolution spectra with typical second-order quadrupolar line shapes allowing the measurement of 14N chemical shift and quadrupolar coupling parameters. This article has also shown that under MAS the main 14NOT peak is shifted by twice the sample spinning frequency with respect to its static position. We present the theory of 14NOT NMR of static or rotating samples and the physical picture of the intriguing spinning-induced shift in the second case. We use perturbation theory for the case of static samples and Floquet theory for rotating samples. In both cases, the results can be described by a so-called OT parameter that scales down the 14NOT radio-frequency (rf) excitation and signal detection. This OT parameter shows that the components of the rf field, which are transverse and longitudinal with respect to the magnetic field, are both effective for 14NOTrf excitation and signal detection. In the case of MAS at angular frequency ωr , the superposition of the excitation and detection components in the OT parameter makes either the +2ωr or -2ωr term the dominant 14NOT signal, depending on the sense of sample spinning with respect to the magnetic field. This leads to an apparent 14NOT signal shifted at twice the spinning frequency. The features of 14NOT NMR spectra for both static and rotating samples are illustrated with simulations. The spinning induced shift and its dependence on the spinning direction are confirmed experimentally by reversing the spinning direction and the field of the 36 T series-connected hybrid magnet at the US National High Magnetic Field Laboratory.
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Affiliation(s)
- Zhehong Gan
- Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
| | - Ivan Hung
- Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
| | | | | | | | - Hiroki Nagashima
- Univ. Lille, CNRS UMR 8181, UCCS Unit of Catalysis and Chemistry of Solids, F-59000 Lille, France
| | - Julien Trébosc
- Univ. Lille, CNRS UMR 8181, UCCS Unit of Catalysis and Chemistry of Solids, 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
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Veinberg SL, Friedl ZW, Lindquist AW, Kispal B, Harris KJ, O'Dell LA, Schurko RW. 14N Solid-State NMR Spectroscopy of Amino Acids. Chemphyschem 2016; 17:4011-4027. [DOI: 10.1002/cphc.201600873] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 09/12/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Stanislav L. Veinberg
- Department of Chemistry and Biochemistry; University of Windsor; 401 Sunset Avenue Windsor Ontario N9B 3P4 Canada
| | - Zachary W. Friedl
- Department of Chemistry and Biochemistry; University of Windsor; 401 Sunset Avenue Windsor Ontario N9B 3P4 Canada
| | - Austin W. Lindquist
- Department of Chemistry and Biochemistry; University of Windsor; 401 Sunset Avenue Windsor Ontario N9B 3P4 Canada
| | - Brianna Kispal
- Department of Chemistry and Biochemistry; University of Windsor; 401 Sunset Avenue Windsor Ontario N9B 3P4 Canada
| | - Kristopher J. Harris
- Department of Chemistry and Biochemistry; University of Windsor; 401 Sunset Avenue Windsor Ontario N9B 3P4 Canada
| | - Luke A. O'Dell
- Institute for Frontier Materials; Deakin University; Waurn Ponds Campus Geelong Victoria 3220 Australia
| | - Robert W. Schurko
- Department of Chemistry and Biochemistry; University of Windsor; 401 Sunset Avenue Windsor Ontario N9B 3P4 Canada
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Benages-Vilau R, Calvet T, Cuevas-Diarte M. Polymorphism, crystal growth, crystal morphology and solid-state miscibility of alkali nitrates. CRYSTALLOGR REV 2013. [DOI: 10.1080/0889311x.2013.838673] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Perras FA, Bryce DL. Measuring dipolar and J coupling between quadrupolar nuclei using double-rotation NMR. J Chem Phys 2013; 138:174202. [DOI: 10.1063/1.4802192] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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Zhou B, Michaelis VK, Kroeker S, Wren JEC, Yao Y, Sherriff BL, Pan Y. 11B and 23Na solid-state NMR and density functional theory studies of electric field gradients at boron sites in ulexite. CrystEngComm 2013. [DOI: 10.1039/c3ce41251b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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8
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O’Dell LA, Ratcliffe CI, Kong X, Wu G. Multinuclear Solid-State Nuclear Magnetic Resonance and Density Functional Theory Characterization of Interaction Tensors in Taurine. J Phys Chem A 2012; 116:1008-14. [DOI: 10.1021/jp210844t] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luke A. O’Dell
- Steacie Institute for Molecular Sciences, National Research Council, 100
Sussex Drive, Ottawa, Ontario, K1A 0R6, Canada
| | - Christopher I. Ratcliffe
- Steacie Institute for Molecular Sciences, National Research Council, 100
Sussex Drive, Ottawa, Ontario, K1A 0R6, Canada
| | - Xianqi Kong
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston,
Ontario, K7L 3N6, Canada
| | - Gang Wu
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston,
Ontario, K7L 3N6, Canada
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Perras FA, Bryce DL. Residual dipolar coupling between quadrupolar nuclei under magic-angle spinning and double-rotation conditions. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2011; 213:82-89. [PMID: 21982836 DOI: 10.1016/j.jmr.2011.08.043] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2011] [Revised: 08/27/2011] [Accepted: 08/30/2011] [Indexed: 05/31/2023]
Abstract
Residual dipolar couplings between spin-1/2 and quadrupolar nuclei are often observed and exploited in the magic-angle spinning (MAS) NMR spectra of spin-1/2 nuclei. These orientation-dependent splittings contain information on the dipolar interaction, which can be translated into structural information. The same type of splittings may also be observed for pairs of quadrupolar nuclei, although information is often difficult to extract from the quadrupolar-broadened lineshapes. Here, the complete theory for describing the dipolar coupling between two quadrupolar nuclei in the frequency domain by Hamiltonian diagonalization is given. The theory is developed under MAS and double-rotation (DOR) conditions, and is valid for any spin quantum numbers, quadrupolar coupling constants, asymmetry parameters, and tensor orientations at both nuclei. All terms in the dipolar Hamiltonian become partially secular and contribute to the NMR spectrum. The theory is validated using experimental 11B and 35/37Cl NMR experiments carried out on powdered B-chlorocatecholborane, where both MAS and DOR are used to help separate effects of the quadrupolar interaction from those of the dipolar interaction. It is shown that the lineshapes are sensitive to the quadrupolar coupling constant of both nuclei and to the J coupling (including its sign). From these experiments, the dipolar coupling constant for a heteronuclear spin pair of quadrupolar nuclei may be obtained as well as the sign of the quadrupolar coupling constant of the perturbing nucleus; these are two parameters that are difficult to obtain experimentally otherwise.
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Affiliation(s)
- Frédéric A Perras
- Department of Chemistry, Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie Private, Ottawa, Ontario, Canada K1N 6N5
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O'Dell LA. Direct detection of nitrogen-14 in solid-state NMR spectroscopy. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2011; 59:295-318. [PMID: 22027340 DOI: 10.1016/j.pnmrs.2011.04.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2011] [Accepted: 04/07/2011] [Indexed: 05/31/2023]
Affiliation(s)
- Luke A O'Dell
- Steacie Institute for Molecular Sciences, National Research Council, 100 Sussex Drive, Ottawa, Ontario, Canada K1N 5A2.
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Jakobsen HJ, Bildsøe H, Gan Z, Brey WW. Experimental aspects in acquisition of wide bandwidth solid-state MAS NMR spectra of low-γ nuclei with different opportunities on two commercial NMR spectrometers. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2011; 211:195-206. [PMID: 21704544 DOI: 10.1016/j.jmr.2011.05.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2011] [Revised: 05/25/2011] [Accepted: 05/26/2011] [Indexed: 05/31/2023]
Abstract
The acquisition and different appearances observed for wide bandwidth solid-state MAS NMR spectra of low-γ nuclei, using (14)N as an illustrative nucleus and employing two different commercial spectrometers (Varian, 14.1T and Bruker, 19.6T), have been compared/evaluated and optimized from an experimental NMR and an electronic engineering point of view, to account for the huge differences in these spectra. The large differences in their spectral appearances, employing the recommended/standard experimental set-up for the two different spectrometers, are shown to be associated with quite large differences in the electronic design of the two types of preamplifiers, which are connected to their respective probes through a 50Ω cable, and are here completely accounted for. This has led to different opportunities for optimum performances in the acquisition of nearly ideal wide bandwidth spectra for low-γ nuclei on the two spectrometers by careful evaluation of the length for the 50Ω probe-to-preamp cable for the Varian system and appropriate changes to the bandwidth (Q) of the NMR probe used on the Bruker spectrometer. Earlier, we reported quite distorted spectra obtained with Varian Unity INOVA spectrometers (at 11.4 and 14.1T) in several exploratory wide bandwidth (14)N MAS NMR studies of inorganic nitrates and amino acids. These spectra have now been compared/evaluated with fully analyzed (14)N MAS spectra correspondingly acquired at 19.6T on a Bruker spectrometer. It is shown that our upgraded version of the STARS simulation/iterative-fitting software is capable of providing identical sets for the molecular spectral parameters and corresponding fits to the experimental spectra, which fully agree with the electronic measurements, despite the highly different appearances for the MAS NMR spectra acquired on the Varian and Bruker spectrometers.
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Affiliation(s)
- Hans J Jakobsen
- Instrument Centre for Solid-State NMR Spectroscopy and Interdisciplinary Nanoscience Center (iNANO), Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark.
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Fernandez C, Pruski M. Probing quadrupolar nuclei by solid-state NMR spectroscopy: recent advances. Top Curr Chem (Cham) 2011; 306:119-88. [PMID: 21656101 DOI: 10.1007/128_2011_141] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Solid-state nuclear magnetic resonance (NMR) of quadrupolar nuclei has recently undergone remarkable development of capabilities for obtaining structural and dynamic information at the molecular level. This review summarizes the key achievements attained during the last couple of decades in solid-state NMR of both integer spin and half-integer spin quadrupolar nuclei. We provide a concise description of the first- and second-order quadrupolar interactions, and their effect on the static and magic angle spinning (MAS) spectra. Methods are explained for efficient excitation of single- and multiple-quantum coherences, and acquisition of spectra under low- and high-resolution conditions. Most of all, we present a coherent, comparative description of the high-resolution methods for half-integer quadrupolar nuclei, including double rotation (DOR), dynamic angle spinning (DAS), multiple-quantum magic angle spinning (MQMAS), and satellite transition magic angle spinning (STMAS). Also highlighted are methods for processing and analysis of the spectra. Finally, we review methods for probing the heteronuclear and homonuclear correlations between the quadrupolar nuclei and their quadrupolar or spin-1/2 neighbors.
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O’Dell LA, Ratcliffe CI. Crystal Structure Based Design of Signal Enhancement Schemes for Solid-State NMR of Insensitive Half-Integer Quadrupolar Nuclei. J Phys Chem A 2010; 115:747-52. [DOI: 10.1021/jp111531e] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Luke A. O’Dell
- Steacie Institute for Molecular Sciences, National Research Council, 100 Sussex Drive, Ottawa, K1A 0R6, Ontario, Canada
| | - Christopher I. Ratcliffe
- Steacie Institute for Molecular Sciences, National Research Council, 100 Sussex Drive, Ottawa, K1A 0R6, Ontario, Canada
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Abrahams SC. Inorganic structures in space group P31m; coordinate analysis and systematic prediction of new ferroelectrics. ACTA CRYSTALLOGRAPHICA SECTION B: STRUCTURAL SCIENCE 2010; 66:173-83. [PMID: 20305351 DOI: 10.1107/s0108768110003290] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2009] [Accepted: 01/26/2010] [Indexed: 11/10/2022]
Abstract
The 62 entries listed in ICSD release 2009/1 under polar space group P31m correspond to 31 families of inorganic crystal structures, some with only one member. Coordinate analysis reveals, over a wide confidence range, 11 of these families as ferroelectric candidates. One includes the well known improper ferroelectric GASH (guanidinium aluminum sulfate hexahydrate), [(C(NH(2))(3))Al(SO(4))(2)(H(2)O)(6)], another the previously predicted ferroelectric CsNO(3) phase II. Those remaining include K(3)Nb(3)B(2)O(12), the minerals schairerite, galeite and lizardite 1T, LaNi(5)D(6) and gamma-CaNi(5)D(6.1), Ca(OCl)(2)Ca(OH)(2), [N(CH(3))(4)](2)Mo(3)S(13), Li(17)Ag(3)Sn(6) and Cs(3)As(5)O(9). Candidate selection is based upon detecting an approach by the reported atomic arrangement to the symmetry of a corresponding nonpolar supergroup. A further 13 families are typified by their reduced predictive properties, with four others likely to remain polar at higher temperatures and the remaining three noted as having a unit cell larger than reported or a misassigned space group. The primary sources of uncertainty in structurally based predictions of ferroelectricity are the reliability of the underlying structural determination and the upper limit assigned to the cationic displacement magnitudes required to achieve supergroup symmetry.
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Affiliation(s)
- S C Abrahams
- Physics Department, Southern Oregon University, Ashland, OR 97520, USA.
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Cuny JÃ, Furet E, Gautier RÃ, Le Pollès L, Pickard CJ, d'Espinose de Lacaillerie JB. Density Functional Theory Calculations of 95Mo NMR Parameters in Solid-State Compounds. Chemphyschem 2009; 10:3320-9. [DOI: 10.1002/cphc.200900586] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Widdifield CM, Bryce DL. Crystallographic structure refinement with quadrupolar nuclei: a combined solid-state NMR and GIPAW DFT example using MgBr2. Phys Chem Chem Phys 2009; 11:7120-2. [DOI: 10.1039/b911448n] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Esrafili MD, Behzadi H, Beheshtian J, Hadipour NL. Theoretical 14N nuclear quadrupole resonance parameters for sulfa drugs: Sulfamerazine and sulfathiazole. J Mol Graph Model 2008; 27:326-31. [DOI: 10.1016/j.jmgm.2008.05.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2008] [Revised: 05/25/2008] [Accepted: 05/27/2008] [Indexed: 11/28/2022]
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Martineau C, Fayon F, Legein C, Buzaré JY, Body M, Massiot D, Goutenoire F. Structure determination of β-Pb2ZnF6 by coupling multinuclear solid state NMR, powder XRD and ab initio calculations. Dalton Trans 2008:6150-8. [DOI: 10.1039/b810863c] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Body M, Legein C, Buzaré JY, Silly G, Blaha P, Martineau C, Calvayrac F. Advances in Structural Analysis of Fluoroaluminates Using DFT Calculations of 27Al Electric Field Gradients. J Phys Chem A 2007; 111:11873-84. [DOI: 10.1021/jp0740696] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- M. Body
- Laboratoire de Physique de l'Etat Condensé, CNRS UMR 6087, Institut de Recherche en Ingénierie Moléculaire et Matériaux Fonctionnels, CNRS FR 2575, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France, Laboratoire des Oxydes et Fluorures, CNRS UMR 6010, Institut de Recherche en Ingénierie Moléculaire et Matériaux Fonctionnels, CNRS FR 2575, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France, Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM2-ENSCM-UM1
| | - C. Legein
- Laboratoire de Physique de l'Etat Condensé, CNRS UMR 6087, Institut de Recherche en Ingénierie Moléculaire et Matériaux Fonctionnels, CNRS FR 2575, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France, Laboratoire des Oxydes et Fluorures, CNRS UMR 6010, Institut de Recherche en Ingénierie Moléculaire et Matériaux Fonctionnels, CNRS FR 2575, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France, Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM2-ENSCM-UM1
| | - J.-Y. Buzaré
- Laboratoire de Physique de l'Etat Condensé, CNRS UMR 6087, Institut de Recherche en Ingénierie Moléculaire et Matériaux Fonctionnels, CNRS FR 2575, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France, Laboratoire des Oxydes et Fluorures, CNRS UMR 6010, Institut de Recherche en Ingénierie Moléculaire et Matériaux Fonctionnels, CNRS FR 2575, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France, Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM2-ENSCM-UM1
| | - G. Silly
- Laboratoire de Physique de l'Etat Condensé, CNRS UMR 6087, Institut de Recherche en Ingénierie Moléculaire et Matériaux Fonctionnels, CNRS FR 2575, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France, Laboratoire des Oxydes et Fluorures, CNRS UMR 6010, Institut de Recherche en Ingénierie Moléculaire et Matériaux Fonctionnels, CNRS FR 2575, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France, Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM2-ENSCM-UM1
| | - P. Blaha
- Laboratoire de Physique de l'Etat Condensé, CNRS UMR 6087, Institut de Recherche en Ingénierie Moléculaire et Matériaux Fonctionnels, CNRS FR 2575, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France, Laboratoire des Oxydes et Fluorures, CNRS UMR 6010, Institut de Recherche en Ingénierie Moléculaire et Matériaux Fonctionnels, CNRS FR 2575, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France, Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM2-ENSCM-UM1
| | - C. Martineau
- Laboratoire de Physique de l'Etat Condensé, CNRS UMR 6087, Institut de Recherche en Ingénierie Moléculaire et Matériaux Fonctionnels, CNRS FR 2575, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France, Laboratoire des Oxydes et Fluorures, CNRS UMR 6010, Institut de Recherche en Ingénierie Moléculaire et Matériaux Fonctionnels, CNRS FR 2575, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France, Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM2-ENSCM-UM1
| | - F. Calvayrac
- Laboratoire de Physique de l'Etat Condensé, CNRS UMR 6087, Institut de Recherche en Ingénierie Moléculaire et Matériaux Fonctionnels, CNRS FR 2575, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France, Laboratoire des Oxydes et Fluorures, CNRS UMR 6010, Institut de Recherche en Ingénierie Moléculaire et Matériaux Fonctionnels, CNRS FR 2575, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France, Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM2-ENSCM-UM1
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Martineau C, Body M, Legein C, Silly G, Buzaré JY, Fayon F. Multinuclear High-Resolution NMR Study of Compounds from the Ternary System NaF−CaF2−AlF3: from Determination to Modeling of NMR Parameters. Inorg Chem 2006; 45:10215-23. [PMID: 17140229 DOI: 10.1021/ic061348j] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
27Al and 23Na NMR satellite transition spectroscopy and 3Q magic-angle-spinning spectra are recorded for three compounds from the ternary NaF-CaF2-AlF3 system. The quadrupolar frequency nuQ, asymmetry parameter etaQ, and isotropic chemical shift deltaiso are extracted from the spectrum reconstructions for five aluminum and four sodium sites. The quadrupolar parameters are calculated using the LAPW-based ab initio code WIEN2k. It is necessary to perform a structure optimization of all compounds to ensure a fine agreement between experimental and calculated parameters. By a comparison of experimental and calculated values, an attribution of all of the 27Al and 23Na NMR lines to the crystallographic sites is achieved. High-speed 19F NMR MAS spectra are recorded and reconstructed for the same compounds, leading to the determination of 18 isotropic chemical shifts. The superposition model developed by Bureau et al. is used, allowing a bijective assignment of the 19F NMR lines to the crystallographic sites.
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Affiliation(s)
- C Martineau
- Laboratoire des Oxydes et Fluorures, CNRS UMR 6010, Université du Maine, Avenue O. Messiaen, 72085 Le Mans Cedex 9, France.
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Truflandier L, Paris M, Payen C, Boucher F. First-Principles Calculations within Periodic Boundary Conditions of the NMR Shielding Tensor for a Transition Metal Nucleus in a Solid State System: The Example of 51V in AlVO4. J Phys Chem B 2006; 110:21403-7. [PMID: 17064085 DOI: 10.1021/jp0648137] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present the first density functional theory based calculations of NMR shielding parameters for a transition metal nucleus using periodic boundary conditions. These calculations employ the gauge-including projected augmented-wave pseudopotential approach. The quality of this method is discussed by comparing experimental and calculated chemical shift tensor eigenvalues for the quadrupolar 51V nucleus in the diamagnetic solid-state compound AlVO4. Furthermore, the combination of shielding tensor with fast and accurate projector augmented-wave electric field gradient tensor calculations allows us to determine the relative orientation of these two tensors.
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Jakobsen HJ, Hove AR, Bildsøe H, Skibsted J. Satellite transitions in natural abundance solid-state (33)S MAS NMR of alums--sign change with zero-crossing of C(Q) in a variable temperature study. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2006; 180:170-7. [PMID: 16495098 DOI: 10.1016/j.jmr.2006.02.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2005] [Revised: 02/03/2006] [Accepted: 02/03/2006] [Indexed: 05/06/2023]
Abstract
Experiences obtained from recent improvements in the performance of solid-state (14)N MAS NMR spectroscopy have been used in a natural abundance (33)S MAS NMR investigation of the satellite transitions for this interesting spin I=3/2 isotope. This study reports the first observation of manifolds of spinning sidebands for these transitions in (33)S MAS NMR as observed for the two alums XAl(SO(4))(2) x 12H(2)O with X=NH(4) and K. For the NH(4)-alum a variable temperature (33)S MAS NMR study, employing the satellite transitions, shows that the (33)S quadrupole coupling constant (C(Q)) exhibits a linear temperature dependence (in the range -35 degrees C to 70 degrees C) with a temperature gradient of 3.1 kHz/ degrees C and undergoes a sign change with zero-crossing for C(Q) at 4 degrees C (277 K). For the isostructural K-alum a quite similar increase in the magnitude of C(Q) with increasing temperature is observed, and with a temperature gradient of 2.3 kHz/ degrees C. Finally, for optimization purposes, a study on the effect of the applied pulse widths at constant rf field strength on the intensity and variation in second-order quadrupolar lineshape for the central (1/2<-->-1/2) transition of the K-alum has been performed.
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Affiliation(s)
- Hans J Jakobsen
- Instrument Center for Solid-State NMR Spectroscopy, Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark.
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Body M, Silly G, Legein C, Buzaré JY, Calvayrac F, Blaha P. 27Al NMR experiments and quadrupolar parameter ab initio calculations: Crystallographic structure refinement of β-Ba3AlF9. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.04.091] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hansen MR, Madsen GKH, Jakobsen HJ, Skibsted J. Evaluation of 27Al and 51V Electric Field Gradients and the Crystal Structure for Aluminum Orthovanadate (AlVO4) by Density Functional Theory Calculations. J Phys Chem B 2006; 110:5975-83. [PMID: 16553406 DOI: 10.1021/jp0555549] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Three sets of crystal-structure data reported for AlVO(4) from two powder-XRD studies and a density functional theory (DFT) investigation, employing the Vienna ab initio simulation package (VASP), have been examined and refined using the DFT structure-optimization scheme implemented in the WIEN2k software. The crystal structures are evaluated on the basis of (27)Al and (51)V quadrupole coupling parameters recently reported for AlVO(4), employing the corresponding electric-field gradient (EFG) tensor elements obtained from the DFT calculations. The DFT calculations provide a reliable assignment of the (27)Al/(51)V resonances from three distinct Al and three V environments to the specific crystallographic sites in the asymmetric unit for AlVO(4). An improved agreement between experimental quadrupole tensor elements and calculated EFG tensors is achieved after the DFT structure optimizations and consistent results are obtained using the three different structures as starting points. The improvement of the structural data is also supported by an evaluation of the Al-O and V-O bond lengths before and after DFT structure optimization. The (51)V nuclear quadrupole moment, |Q((51)V)| = 4.8 +/- 0.1 fm(2), derived from the present analysis, represents a value of higher accuracy than earlier reported Q((51)V) values. The origin of the (27)Al and (51)V EFGs are investigated by an evaluation of the orientations of the EFG tensors in the crystal frame and by an examination of the individual contributions from the valence electrons and the surrounding lattice. The latter investigation shows that the magnitude and orientation of the tensors are largely determined by the p-p((27)Al) and p-p, d-d((51)V) orbital contributions to the valence electrons, while the lattice part only gives a minor contribution for both nuclei.
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Affiliation(s)
- Michael Ryan Hansen
- Instrument Centre for Solid-State NMR Spectroscopy, University of Aarhus, DK-8000 Aarhus C, Denmark
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Jakobsen HJ, Hove AR, Hazell RG, Bildsøe H, Skibsted J. Solid-state (14)N MAS NMR of ammonium ions as a spy to structural insights for ammonium salts. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2006; 44:348-56. [PMID: 16477689 DOI: 10.1002/mrc.1772] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The high resolution offered by magic-angle spinning (MAS), when compared to the static condition in solid-state NMR of powders, has been used to full advantage in a (14)N MAS NMR study of some ammonium salts: CH(3)NH(3)Cl, (NH(4))(2)(COO)(2) x H(2)O, (CH(3))(3)(C(6)H(5)CH(2))NCl, (CH(3))(3)(C(6)H(5))NI, [(n-C(4)H(9))(4)N](2)Mo(2)O(7), (NH(4))(2)HPO(4), and NH(4)H(2)PO(4). It is shown that the high-quality (14)N MAS NMR spectra, which can be obtained for these salts, allow determination of the (14)N quadrupole coupling parameters, i.e. C(Q) (the quadrupole coupling constant) and eta(Q) (the asymmetry parameter), with very high precision. In particular, it is shown that precise C(Q), eta(Q) parameters can be determined for at least two different (14)N sites in case the individual spinning-sideband (ssb) intensities arise from a single manifold of ssbs, i.e. the ssbs for the two sites cannot be resolved. This feature of (14)N MAS NMR, which is the first demonstration for manifolds of ssb in MAS NMR without the potential information from a central transition, becomes especially useful at the slow spinning frequencies (nu(r) = 1000-1500 Hz) applied to some of the ammonium salts studied here. The detection of the number of sites has been confirmed by the corresponding crystal structures determined from single-crystal X-ray diffraction (XRD), either in this work for the unknown structure of benzyl trimethylammonium chloride or from reports in the literature. The magnitudes of the (14)N quadrupole coupling constants for the ammonium salts studied here are in the range from C(Q) approximately 20 kHz to 1 MHz while the asymmetry parameters span the full range 0 < or = eta(Q) < or = 1. Clearly, the (14)N quadrupole coupling parameters (C(Q), eta(Q)) for ammonium ions appear highly sensitive toward crystal structure and therefore appreciably more informative for the characterization of ammonium salts in comparison to the isotropic (14)N (or (15)N) chemical shifts.
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Affiliation(s)
- Hans J Jakobsen
- Instrument Centre for Solid-State NMR Spectroscopy, Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark.
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Body M, Silly G, Legein C, Buzaré JY, Calvayrac F, Blaha P. Structural investigations of β-CaAlF5 by coupling powder XRD, NMR, EPR and spectroscopic parameter calculations. J SOLID STATE CHEM 2005. [DOI: 10.1016/j.jssc.2005.09.021] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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