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Bryce DL. Double-rotation (DOR) NMR spectroscopy: Progress and perspectives. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2024; 130:101923. [PMID: 38471386 DOI: 10.1016/j.ssnmr.2024.101923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 03/05/2024] [Accepted: 03/06/2024] [Indexed: 03/14/2024]
Abstract
Double-rotation (DOR) solid-state NMR spectroscopy is a high-resolution technique developed in the late 1980s. Although multiple-quantum magic-angle spinning (MQMAS) became the most widely used high-resolution method for half-integer spin quadrupoles after 1995, development and application of DOR NMR to a variety of chemical and materials science problems has endured. This Trend article recapitulates the development of DOR NMR, discusses various applications, and describes possible future directions. The main technical limitations specific to DOR NMR are simply related to the size of the double rotor system. The relatively large outer rotor (and thus coil) used for most applications over the past 35 years translates into relatively low rotor spinning frequencies, a low filling factor, and weak radiofrequency powers available for excitation and for proton decoupling. Ongoing developments in NMR instrumentation, including ever-shrinking MAS rotors and spherical NMR rotors, could solve many of these problems and may augur a renaissance for DOR NMR.
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Affiliation(s)
- David L Bryce
- Department of Chemistry and Biomolecular Sciences, Centre for Catalysis Research and Innovation, and Nexus for Quantum Technologies, University of Ottawa, 10 Marie Curie Private, Ottawa, Ontario, K1N 6N5, Canada.
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3
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One-Step Synthesis of Acetals from Phenol/Alcohols Mixtures Using a Pd/Aluminoborate Catalyst. Catal Letters 2012. [DOI: 10.1007/s10562-012-0891-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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4
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Deters H, Eckert H. Characterization of the glass-to-vitroceramic transition in yttrium aluminum borate laser glasses using solid state NMR. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2012; 41:48-59. [PMID: 22244244 DOI: 10.1016/j.ssnmr.2011.11.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Revised: 11/14/2011] [Indexed: 05/31/2023]
Abstract
The crystallization of laser glasses in the system (Y(2)O(3))(0.2){((Al(2)O(3))(x))(B(2)O(3))(0.8-x)} (0.15 ≤ x ≤ 0.40) doped with 0.5 mol% of ytterbium oxide has been investigated by x-ray powder diffraction, and various solid state NMR techniques. The crystallization process has been analyzed in a quantitative fashion by high-resolution solid state (11)B, (27)Al, and (89)Y NMR spectroscopy as well as (11)B{(27)Al} and (27)Al{(11)B} rotational echo double resonance (REDOR) experiments. The homogeneous glasses undergo major phase segregation processes resulting in crystalline Al(5)BO(9) (historically denoted as Al(18)B(4)O(33)), YBO(3), crystalline YAl(3)(BO(3))(4), residual glassy B(2)O(3), and an additional yet not identified crystalline phase ("X-phase").
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Affiliation(s)
- Heinz Deters
- Institut für Physikalische Chemie, Graduate School of Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, D48149 Münster, Germany
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Fisch M, Armbruster T, Rentsch D, Libowitzky E, Pettke T. Crystal-chemistry of mullite-type aluminoborates Al18B4O33 and Al5BO9: A stoichiometry puzzle. J SOLID STATE CHEM 2011. [DOI: 10.1016/j.jssc.2010.10.032] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Vyalikh A, Massiot D, Scheler U. Structural characterisation of aluminium layered double hydroxides by (27)Al solid-state NMR. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2009; 36:19-23. [PMID: 19477101 DOI: 10.1016/j.ssnmr.2009.04.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2008] [Revised: 02/27/2009] [Accepted: 04/22/2009] [Indexed: 05/27/2023]
Abstract
(27)Al solid-state NMR has been applied to study the local structure of pristine and chemically modified aluminium layered double hydroxides (LDH). The pristine LDH only shows six-fold coordinated, octahedral, aluminium, while the calcined and subsequently surfactant treated LDH sample shows a significant fraction of four-fold coordinated tetrahedral aluminium. The co-existence of two types of octahedral sites with different quadrupolar parameters is clearly observed in both samples. Quadrupolar coupling constants and isotropic chemical shifts have been measured from the (27)Al triple-quantum MAS NMR allowing to fit the (27)Al MAS spectra and quantify the different species in the samples. The quantitative analysis reveals that 30% of the aluminium is in four-fold coordination in the surfactant-modified LDH. We show that this chemical modification retains the two types of AlO(6) sites with a decreased intensity of the site showing the lowest quadrupolar coupling constant.
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Affiliation(s)
- Anastasia Vyalikh
- Leibniz Institute of Polymer Research Dresden, Hohe Str. 6, D-01069 Dresden, Germany
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Hung I, Wong A, Howes AP, Anupõld T, Samoson A, Smith ME, Holland D, Brown SP, Dupree R. Separation of isotropic chemical and second-order quadrupolar shifts by multiple-quantum double rotation NMR. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2009; 197:229-236. [PMID: 19201231 DOI: 10.1016/j.jmr.2009.01.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2008] [Revised: 01/06/2009] [Accepted: 01/06/2009] [Indexed: 05/27/2023]
Abstract
Using a two-dimensional multiple-quantum (MQ) double rotation (DOR) experiment the contributions of the chemical shift and quadrupolar interaction to isotropic resonance shifts can be completely separated. Spectra were acquired using a three-pulse triple-quantum z-filtered pulse sequence and subsequently sheared along both the nu(1) and nu(2) dimensions. The application of this method is demonstrated for both crystalline (RbNO(3)) and amorphous samples (vitreous B(2)O(3)). The existence of the two rubidium isotopes ((85)Rb and (87)Rb) allows comparison of results for two nuclei with different spins (I=3/2 and 5/2), as well as different dipole and quadrupole moments in a single chemical compound. Being only limited by homogeneous line broadening and sample crystallinity, linewidths of approximately 0.1 and 0.2 ppm can be measured for (87)Rb in the quadrupolar and chemical shift dimensions, enabling highly accurate determination of the isotropic chemical shift and the quadrupolar product, P(Q). For vitreous B(2)O(3), the use of MQDOR allows the chemical shift and electric field gradient distributions to be directly determined-information that is difficult to obtain otherwise due to the presence of second-order quadrupolar broadening.
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Affiliation(s)
- Ivan Hung
- Physics Department, University of Warwick, Coventry, UK
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Gan Z, Kwak HT, Bird M, Cross T, Gor'kov P, Brey W, Shetty K. High-field NMR using resistive and hybrid magnets. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2008; 191:135-140. [PMID: 18226940 DOI: 10.1016/j.jmr.2007.12.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2007] [Revised: 12/03/2007] [Accepted: 12/20/2007] [Indexed: 05/25/2023]
Abstract
Resistive and resistive-superconducting hybrid magnets can generate dc magnetic fields much higher than conventional superconducting NMR magnets but the field spatial homogeneity and temporal stability are usually not sufficient for high-resolution NMR experiments. Hardware and technique development addressing these issues are presented for high-resolution NMR at magnetic fields up to 40T. Passive ferromagnetic shimming and magic-angle spinning are used effectively to reduce the broadening from inhomogeneous magnetic field. A phase correction technique based on simultaneous heteronuclear detection is developed to compensate magnetic field fluctuations to achieve high spectral resolution.
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Affiliation(s)
- Zhehong Gan
- Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA.
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Dambournet D, Demourgues A, Martineau C, Durand E, Majimel J, Vimont A, Leclerc H, Lavalley JC, Daturi M, Legein C, Buzaré JY, Fayon F, Tressaud A. Structural investigations and acidic properties of high surface area pyrochlore aluminium hydroxyfluoride. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b718856k] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Durupthy O, Maquet J, Bonhomme C, Coradin T, Livage J, Steunou N. Room temperature sol–gel synthesis of crystalline Cs[V3O8]. Probing the hydration level of the interlamellar space by 51V and 133Cs MAS NMR spectroscopy. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b804397c] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hung I, Wong A, Howes AP, Anupõld T, Past J, Samoson A, Mo X, Wu G, Smith ME, Brown SP, Dupree R. Determination of NMR interaction parameters from double rotation NMR. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2007; 188:246-59. [PMID: 17707665 DOI: 10.1016/j.jmr.2007.07.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2007] [Revised: 07/18/2007] [Accepted: 07/19/2007] [Indexed: 05/16/2023]
Abstract
It is shown that the anisotropic NMR parameters for half-integer quadrupolar nuclei can be determined using double rotation (DOR) NMR at a single magnetic field with comparable accuracy to multi-field static and MAS experiments. The (17)O nuclei in isotopically enriched l-alanine and OPPh(3) are used as illustrations. The anisotropic NMR parameters are obtained from spectral simulation of the DOR spinning sideband intensities using a computer program written with the GAMMA spin-simulation libraries. Contributions due to the quadrupolar interaction, chemical shift anisotropy, dipolar coupling and J coupling are included in the simulations. In l-alanine the oxygen chemical shift span is 455 +/- 20 ppm and 350 +/- 20 ppm for the O1 and O2 sites, respectively, and the Euler angles are determined to an accuracy of +/- 5-10 degrees . For cases where effects due to heteronuclear J and dipolar coupling are observed, it is possible to determine the angle between the internuclear vector and the principal axis of the electric field gradient (EFG). Thus, the orientation of the major components of both the EFG and chemical shift tensors (i.e., V(33) and delta(33)) in the molecular frame may be obtained from the relative intensity of the split DOR peaks. For OPPh(3) the principal axis of the (17)O EFG is found to be close to the O-P bond, and the (17)O-(31)P one-bond J coupling ((1)J(OP)=161 +/- 2 Hz) is determined to a much higher accuracy than previously.
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Affiliation(s)
- I Hung
- Physics Department, University of Warwick, Coventry, UK
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12
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Dey KK, Prasad S, Ash JT, Deschamps M, Grandinetti PJ. Spectral editing in solid-state MAS NMR of quadrupolar nuclei using selective satellite inversion. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2007; 185:326-30. [PMID: 17218134 DOI: 10.1016/j.jmr.2006.12.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2006] [Revised: 12/15/2006] [Accepted: 12/19/2006] [Indexed: 05/13/2023]
Abstract
A sensitivity enhancement method based on selective adiabatic inversion of a satellite transition has been employed in a (pi/2)CT-(pi)ST1-(pi/2)CT spectral editing sequence to both enhance and resolve multisite NMR spectra of quadrupolar nuclei. In addition to a total enhancement of 2.5 times for spin 3/2 nuclei, enhancements up to 2.0 times is reported for the edited sites in a mixture of rubidium salts.
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Affiliation(s)
- Krishna K Dey
- Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, Columbus, OH 43210-1173, USA
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Vosegaard T, Massiot D. High-resolution two-dimensional NMR spectra of half-integer-spin quadrupolar nuclei from one-dimensional projections. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.01.077] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Florian P, Anghel EM, Bessada C. Structural Description of the Na2B4O7−Na3AlF6−TiO2 System. 2. A Multinuclear NMR Approach of Melts and Solids. J Phys Chem B 2007; 111:968-78. [PMID: 17266250 DOI: 10.1021/jp065201p] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A quantitative structural investigation of pseudo-binary Na2B4O7-[Na3AlF6-TiO2]11 was carried out by NMR spectroscopy. We applied high-resolution solid-state NMR on quenched samples and in situ high-temperature NMR spectroscopy on molten compositions to obtain a more accurate description of the melts. Consistent with our previous findings, two compositional ranges can be evidenced. Below 50 mol % Na2B4O7, the TiIV --> TiVI valence conversion prevails, leading to the formation of B(O,F)3 species at the expense of B(O,F)4 ones and a low average coordination number of aluminum; above 50 mol %, the system behaves mainly like the binary Na2B4O7-Na3AlF6 where Na3AlF6 is playing a network former role. The dominant oxyfluoro-species evidenced by double-resonance NMR in the quenched samples are BO2F2, BO3F, BO2F, BOF2, NaO7F, NaO6F2, and AlO4F with sodium in various coordination states, Na(O,F)8, Na(O,F)7, and Na(O,F)6. F-Ti bonds were found to be almost negligible whereas F-Al2, F-B, F-Na, and F-Al-Na bonds were clearly observed in the solid state.
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Affiliation(s)
- Pierre Florian
- Centre de Recherche sur les Matériaux à Haute Température, CRMHT-CNRS, 1D, Avenue de la Recherche Scientifique, 45071 Orléans, Cedex 2, France
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Hung I, Howes A, Anupõld T, Samoson A, Massiot D, Smith M, Brown S, Dupree R. 27Al double rotation two-dimensional spin diffusion NMR: Complete unambiguous assignment of aluminium sites in 9Al2O3·2B2O3. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.10.085] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Massiot D, Hiet J, Pellerin N, Fayon F, Deschamps M, Steuernagel S, Grandinetti PJ. Two-dimensional one pulse MAS of half-integer quadrupolar nuclei. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2006; 181:310-5. [PMID: 16814581 DOI: 10.1016/j.jmr.2006.05.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2006] [Accepted: 05/01/2006] [Indexed: 05/10/2023]
Abstract
We show that the two-dimensional one pulse (TOP) representation of magic-angle spinning nuclear magnetic resonance data of half-integer quadrupolar nuclei has significant advantages over the conventional one-dimensional spectrum. The TOP spectrum, which correlates NMR frequency to spinning sideband order, provides a rapid determination of the number of sites as well as the size of the their quadrupolar coupling. Additionally, synchronous acquisition spectra of the central and satellite transition resonances can be separated by different projections of the TOP spectrum, with higher resolution spectra often found in the satellite transitions projection. A previously perceived problem of centerband aliasing in TOP can be eliminated with an algorithm that uses larger subspectral widths and the sideband order dimension to distinguish centerbands from sidebands.
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Zhou D, Chen L, Yu J, Li Y, Yan W, Deng F, Xu R. Synthesis, Crystal Structure, and Solid-State NMR Spectroscopy of a New Open-Framework Aluminophosphate (NH4)2Al4(PO4)4(HPO4)·H2O. Inorg Chem 2005; 44:4391-7. [PMID: 15934770 DOI: 10.1021/ic048476x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new three-dimensional open-framework aluminophosphate (NH(4))(2)Al(4)(PO(4))(4)(HPO(4)).H(2)O (denoted AlPO-CJ19) with an Al/P ratio of 4/5 has been synthesized, using pyridine as the solvent and 2-aminopyridine as the structure-directing agent, under solvothermal conditions. The structure was determined by single-crystal X-ray diffraction and further characterized by solid-state NMR techniques. The alternation of the Al-centered polyhedra (including AlO(4), AlO(5), and AlO(6)) and the P-centered tetrahedra (including PO(4) and PO(3)OH) results in an interrupted open-framework structure with an eight-membered ring channel along the [100] direction. This is the first aluminophosphate containing three kinds of Al coordinations (AlO(4), AlO(5), and AlO(6)) with all oxygen vertexes connected to framework P atoms. (27)Al MAS NMR, (31)P MAS NMR, and (1)H --> (31)P CPMAS NMR characterizations show that the solid-state NMR techniques are an effective complement to XRD analysis for structure elucidation. Furthermore, all of the possible coordinations of Al and P in the aluminophosphates with an Al/P ratio of 4/5 are summarized. Crystal data: (NH(4))(2)Al(4)(PO(4))(4)(HPO(4))xH(2)O, monoclinic P2(1) (No. 4), a = 5.0568(3) A, b = 21.6211(18) A, c = 8.1724(4) A, beta = 91.361(4) degrees , V = 893.27(10) A(3), Z = 2, R(1) = 0.0456 (I > 2 sigma(I)), and wR(2) = 0.1051 (all data).
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Affiliation(s)
- Dan Zhou
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China
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Bessada C, Anghel EM. 11B, 23Na, 27Al, and 19F NMR study of solid and molten Na3AlF6-Na2B4O7. Inorg Chem 2003; 42:3884-90. [PMID: 12793826 DOI: 10.1021/ic026074o] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
High temperature electrochemical synthesis is a very promising method for the production of refractory boride powders and coatings. The Na(2)B(4)O(7)-Na(3)AlF(6) binary system is part of the more complex NaCl-Na(3)AlF(6)-Na(2)B(4)O(7)-TiO(2) electrolyte proposed for TiB(2) electrosynthesis. A new approach by high temperature and high resolution solid state nuclear magnetic resonance was employed for the structural description of this system, from the solid at room temperature to the liquid at 1100 degrees C. The change in (27)Al, (23)Na, (11)B, and (19)F NMR spectra with composition give evidence for the insertion of aluminum into the glassy network of Na(2)B(4)O(7) as [AlO(4)] and diluted [AlF(6)] units as well as formation of [BOF(2)] groups into solidified mixtures. A devitrification mechanism of glassy Na(2)B(4)O(7) under influence of Na(3)AlF(6) addition and temperature was discussed in terms of lowering boron coordination and obtaining oxyfluoride species.
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Affiliation(s)
- Catherine Bessada
- CNRS, Centre de Recherche sur les Matériaux à Hautes Températures, 1D, Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France.
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Siegel R, Hirschinger J, Carlier D, Ménétrier M, Delmas C. 59Co, 23Na NMR and electric field gradient calculations in the layered cobalt oxides NaCoO2 and HCoO2. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2003; 23:243-262. [PMID: 12787906 DOI: 10.1016/s0926-2040(03)00017-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
59Co and 23Na NMR has been applied to the layered cobalt oxides NaCoO(2) and HCoO(2) at three different magnetic field strengths (4.7, 7.1 and 11.7T). The 59Co and 23Na quadrupole and anisotropic shift tensors have been determined by iterative fitting of the NMR line shapes at the three magnetic field strengths. Due to the large 59Co quadrupole interaction in NaCoO(2), a frequency-swept irradiation procedure was used to alleviate the limited bandwidth of the excitation. While the 59Co and 23Na shift and quadrupole coupling tensors in NaCoO(2) are found to be coincident and axially symmetric in agreement with the crystal symmetry requirements, the fits of the 59Co NMR spectra clearly show the presence of structural disorder in HCoO(2). The 23Na chemical shift anisotropy can be reproduced by shift tensor calculations using a point dipole model and considering that the magnetic susceptibility in NaCoO(2) is due to Van Vleck paramagnetism for Co(3+). Electric field gradient calculations using either the empirical point charge model or the ab initio full potential-linearized augmented plane wave method are compared with the experimental NMR data.
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Affiliation(s)
- Renée Siegel
- Institut de Chimie, FRE 2446 CNRS, Université Louis Pasteur, BP 296, Strasbourg Cedex 67008, France
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Gan Z, Gor'kov P, Cross TA, Samoson A, Massiot D. Seeking higher resolution and sensitivity for NMR of quadrupolar nuclei at ultrahigh magnetic fields. J Am Chem Soc 2002; 124:5634-5. [PMID: 12010025 DOI: 10.1021/ja025849p] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report the acquisition of solid-state NMR spectra of quadrupolar nuclei obtained at very high magnetic fields (25 and 40 T), thus improving spectral sensitivity and resolution. For an example compound, the MAS spectrum obtained at 40 T is nearly free from the second-order quadrupolar broadening and can be interpreted quantitatively in a very simple manner.
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Affiliation(s)
- Zhehong Gan
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA.
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21
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Azaïs T, Bonhomme-Coury L, Vaissermann J, Bertani P, Hirschinger J, Maquet J, Bonhomme C. Synthesis and characterization of a novel cyclic aluminophosphinate: structure and solid-state NMR study. Inorg Chem 2002; 41:981-8. [PMID: 11849102 DOI: 10.1021/ic010700k] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present the structure and a multinuclear solid-state NMR study of a new cyclic aluminophosphinate. The crystallographic structure of [Al(2)(HC(6)H(5)PO(2))(2)(C(4)H(9)OH)(8)]Cl(4) (compound 1) was obtained at low temperature (a = 11.830(7) A, b = 14.216(6) A, c = 17.790(6) A, beta = 91.25(4) degrees, monoclinic, P21/c, Z = 2). (13)C IRCP (inversion recovery cross polarization) and NQS (non quaternary suppression) NMR experiments allowed the complete assignment of the quaternary carbon atom of the phenyl ring and the precise determination of the isotropic /(1)J(P-C)/ coupling constant. (31)P CP MAS dynamics was carefully studied by varying the contact time. Dipolar oscillations even at slow MAS were observed. Up to 11 kHz, these oscillations were more pronounced, and the P-H distance was easily extracted. (27)Al NMR quadrupolar parameters for 1 were obtained with very good accuracy, and unusual satellite transition splitting was observed. Furthermore, the isotropic lines of the inner and outer transitions were clearly observable, leading to the unambiguous determination of the quadrupolar parameters.
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Affiliation(s)
- Thierry Azaïs
- Laboratoire de Chimie de la Matière Condensée, Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris Cedex 05, France
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22
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Stebbins J, Du LS, Kroeker S, Neuhoff P, Rice D, Frye J, Jakobsen HJ. New opportunities for high-resolution solid-state NMR spectroscopy of oxide materials at 21.1- and 18.8-T fields. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2002; 21:105-115. [PMID: 11949814 DOI: 10.1006/snmr.2001.0051] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We present here high-resolution solid state NMR spectra of several oxide and silicate materials that illustrate the improvements obtainable with very high external fields (18.8 and 21.1 T), with probes capable of tuning to a wide frequency range that allow observations of nuclides from high to low magnetogyric ratio. We discuss 27Al MAS spectra for the zeolite scolecite (CaAl2Si3O10 x 3H2O), 17O MAS data for analcime (NaAlSi2O6 x H2O), calcium monoaluminate (CaAI2O4), and titanite (CaTiSiO5), 39K spin-echo spectra for leucite (KAlSi2O6), microline (KAlSiO8), muscovite (KAl2(AlSi3O10)(OH2) and a potassium aluminosolicate glass, and preliminary 73Ge spin-echo MAS spectra for crystalline and glassy germanium dioxide (GeO2).
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Affiliation(s)
- J Stebbins
- Department of Geological and Environmental Sciences, Stanford University, California 94305-2115, USA.
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Florian P, Gervais M, Douy A, Massiot D, Coutures JP. A Multi-nuclear Multiple-Field Nuclear Magnetic Resonance Study of the Y2O3−Al2O3 Phase Diagram. J Phys Chem B 2000. [DOI: 10.1021/jp0008851] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pierre Florian
- CNRS−CRMHT, 1D Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France
| | - Monique Gervais
- CNRS−CRMHT, 1D Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France
| | - André Douy
- CNRS−CRMHT, 1D Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France
| | - Dominique Massiot
- CNRS−CRMHT, 1D Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France
| | - Jean-Pierre Coutures
- CNRS−CRMHT, 1D Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France
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Iuga D, Schäfer H, Verhagen R, Kentgens AP. Population and coherence transfer induced by double frequency sweeps in half-integer quadrupolar spin systems. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2000; 147:192-209. [PMID: 11097810 DOI: 10.1006/jmre.2000.2192] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We have recently shown that the sensitivity of single- and multiple-quantum NMR experiments of half-integer (N/2) quadrupolar nuclei can be increased significantly by introducing so-called double frequency sweeps (DFS) in various pulse schemes. These sweeps consist of two sidebands generated by an amplitude modulation of the RF carrier. Using a time-dependent amplitude modulation the sidebands can be swept through a certain frequency range. Inspired by the work of Vega and Naor (J. Chem. Phys. 75, 75 (1981)), this is used to manipulate +/-(m - 1) <--> +/-m (3/2 < or = m < or = N/2) satellite transitions in half-integer spin systems simultaneously. For (23)Na (I = 3/2) and (27)Al (I = 5/2) spins in single crystals it proved possible to transfer the populations of the outer +/-m spin levels to the inner +/-1/2 spin levels. A detailed analysis shows that the efficiency of this process is a function of the adiabaticity with which the various spin transitions are passed during the sweep. In powders these sweep parameters have to be optimized to satisfy the appropriate conditions for a maximum of spins in the powder distribution. The effects of sweep rate, sweep range, and RF field strength are investigated both numerically and experimentally. Using a DFS as a preparation period leads to significantly enhanced central transition powder spectra under both static and MAS conditions, compared to single pulse excitation. DFSs prove to be very efficient tools not only for population transfer, but also for coherence transfer. This can be exploited for the multiple- to single-quantum transfer in MQMAS experiments. It is demonstrated, theoretically and experimentally, that DFSs are capable of transferring both quintuple-quantum and triple-quantum coherence into single-quantum coherence in I = 5/2 spin systems. This leads to a significant enhancement in signal-to-noise ratio and strongly reduces the RF power requirement compared to pulsed MQMAS experiments, thus extending their applicability. This is demonstrated by (27)Al 3QMAS experiments on 9Al(2)O(3). 2B(2)O(3) and the mineral andalusite. In the latter compound, Al experiences a quadrupolar-coupling constant of 15.3 MHz in one of the sites. Finally a 5QMAS spectrum on 9Al(2)O(3). 2B(2)O(3) demonstrates the sensitivity enhancement of this experiment using a double frequency sweep.
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Affiliation(s)
- D Iuga
- NWO/CW HF-NMR Facility, NSR Center, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
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Sensitivity enhancements in MQ-MAS NMR of spin-5/2 nuclei using modulated rf mixing pulses1Presented in part at the 1st Alpine Conference on Solid-State NMR, September 1999, Chamonix, France.1. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)00779-x] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Iuga D, Simon S, de Boer E, Kentgens APM. A Nuclear Magnetic Resonance Study of Amorphous and Crystalline Lanthanum-Aluminates. J Phys Chem B 1999. [DOI: 10.1021/jp991257q] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Alemany LB, Steuernagel S, Amoureux JP, Callender RL, Barron AR. Very fast MAS and MQMAS NMR studies of the spectroscopically challenging minerals kyanite and andalusite on 400, 500, and 800 MHz spectrometers. SOLID STATE NUCLEAR MAGNETIC RESONANCE 1999; 14:1-18. [PMID: 10408271 DOI: 10.1016/s0926-2040(99)00011-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The well-characterized minerals kyanite and andalusite have long presented great challenges in using solid state 27Al NMR to determine the isotropic chemical shift deltaCS, quadrupole coupling constant e2qQ/h, and asymmetry parameter eta for each of the inequivalent aluminum sites in these minerals. Indeed, these minerals have frequently been used to test advances in instrumentation. Recent advances in magnet technology (up to 18.8 T = 800 MHz 1H) and in MAS probe technology (spinning up to 35 kHz and considerably stronger rf) and refinements of the two-dimensional, multiple quantum magic angle spinning (MQMAS) technique suggested that these developments could be profitably used to study kyanite and andalusite by solid state 27Al NMR. The benefit of being able to study kyanite both by MAS and MQMAS techniques on 400, 500, and 800 MHz spectrometers is demonstrated. The two octahedral aluminum sites with the largest (and nearly equal) e2qQ/h values give overlapping 1D MAS or 2D 3QMAS signals at all three field strengths. Nevertheless, quantitatively accurate 3Q signal intensities at 9.4 T for all four octahedral aluminum sites (with e2qQ/h values up to 10 MHz) allow more detailed analysis. Even if the 3Q signal intensities are not quantitative, their isotropic shifts provide an approach (if accurate e2qQ/h and eta values are available) other than deconvolution of the MAS spectrum for calculating deltaCS values. For andalusite, 34 kHz MAS on the 800 MHz spectrometer significantly narrows the extremely broad signal for the octahedral aluminum, and only slight difficulties are encountered in quantitating the relative amounts of AlO5 and AlO6 present. Even with e2qQ/h = 15.3 MHz, the octahedral aluminum in andalusite gives a signal in a MQMAS experiment, albeit of reduced intensity. As appropriate, we discuss some of the benefits and limitations of these advances in instrumentation and of different experimental approaches for studying non-integral spin quadrupolar nuclei in solids.
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Affiliation(s)
- L B Alemany
- Rice University, Department of Chemistry, Houston, TX 77005-1892, USA
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Jansen SR, Hintzen HT, Metselaar R, de Haan JW, van de Ven LJM, Kentgens APM, Nachtegaal GH. Multiple Quantum 27Al Magic-Angle-Spinning Nuclear Magnetic Resonance Spectroscopic Study of SrAl12O19: Identification of a 27Al Resonance from a Well-Defined AlO5 Site. J Phys Chem B 1998. [DOI: 10.1021/jp981224v] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Massiot D, Touzo B, Trumeau D, Coutures JP, Virlet J, Florian P, Grandinetti PJ. Two-dimensional magic-angle spinning isotropic reconstruction sequences for quadrupolar nuclei. SOLID STATE NUCLEAR MAGNETIC RESONANCE 1996; 6:73-83. [PMID: 8925268 DOI: 10.1016/0926-2040(95)01210-9] [Citation(s) in RCA: 137] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Two-dimensional magic-angle spinning (triple quantum, single quantum) correlation pulse sequences and phase cycles based on the technique of Frydman and Harwood for the reconstruction of the isotropic spectrum of half-integer spin quadrupolar nuclei broadened to second-order are described. These sequences provide pure absorption mode two-dimensional lineshapes and increased sensitivity. Experimental examples on spin I = 3/2 (87Rb in RbNO3) and I = 5/2 (27Al in NaSi3AlO8) are presented. The isotropic chemical shift and quadrupolar coupling parameters could be obtained from a simple analysis of the triple quantum filtered single quantum magic-angle spinning cross-sections.
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Affiliation(s)
- D Massiot
- Centre de Recherches sur la Physique des Hautes Températures, Orléans, France
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