1
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Schröder N, Bartalucci E, Wiegand T. Probing Noncovalent Interactions by Fast Magic-Angle Spinning NMR at 100 kHz and More. Chemphyschem 2024:e202400537. [PMID: 39129653 DOI: 10.1002/cphc.202400537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Revised: 06/19/2024] [Indexed: 08/13/2024]
Abstract
Noncovalent interactions are the basis for a large number of chemical and biological molecular-recognition processes, such as those occurring in supramolecular chemistry, catalysis, solid-state reactions in mechanochemistry, protein folding, protein-nucleic acid binding, and biomolecular phase separation processes. In this perspective article, some recent developments in probing noncovalent interactions by proton-detected solid-state Nuclear Magnetic Resonance (NMR) spectroscopy at Magic-Angle Spinning (MAS) frequencies of 100 kHz and more are reviewed. The development of MAS rotors with decreasing outer diameters, combined with the development of superconducting magnets operating at high static magnetic-field strengths up to 28.2 T (1200 MHz proton Larmor frequency) improves resolution and sensitivity in proton-detected solid-state NMR, which is the fundamental requirement for shedding light on noncovalent interactions in solids. The examples reported in this article range from protein-nucleic acid binding in large ATP-fueled motor proteins to a hydrogen-π interaction in a calixarene-lanthanide complex.
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Affiliation(s)
- Nina Schröder
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074, Aachen, Germany
| | - Ettore Bartalucci
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074, Aachen, Germany
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim/Ruhr, Germany
| | - Thomas Wiegand
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074, Aachen, Germany
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim/Ruhr, Germany
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2
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Abstract
Poly(carbon monofluoride), or (CF)n, is a layered fluorinated graphite material consisting of nanosized platelets. Here, we present experimental multidimensional solid-state NMR spectra of (CF)n, supported by density functional theory (DFT) calculations of NMR parameters, which overhauls our understanding of structure and bonding in the material by elucidating many ways in which disorder manifests. We observe strong 19F NMR signals conventionally assigned to elongated or "semi-ionic" C-F bonds and find that these signals are in fact due to domains where the framework locally adopts boat-like cyclohexane conformations. We calculate that C-F bonds are weakened but are not elongated by this conformational disorder. Exchange NMR suggests that conformational disorder avoids platelet edges. We also use a new J-resolved NMR method for disordered solids, which provides molecular-level resolution of highly fluorinated edge states. The strings of consecutive difluoromethylene groups at edges are relatively mobile. Topologically distinct edge features, including zigzag edges, crenellated edges, and coves, are resolved in our samples by solid-state NMR. Disorder should be controllable in a manner dependent on synthesis, affording new opportunities for tuning the properties of graphite fluorides.
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Affiliation(s)
- Brennan J Walder
- Sandia National Laboratories, Department of Organic Materials Science, Albuquerque, New Mexico 87185, United States
| | - Todd M Alam
- Sandia National Laboratories, Department of Organic Materials Science, Albuquerque, New Mexico 87185, United States
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3
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Tan C, Chen Y, Peng X, Chen Z, Cai S, Cross TA, Fu R. Revealing weak histidine 15N homonuclear scalar couplings using Solid-State Magic-Angle-Spinning NMR spectroscopy. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2020; 316:106757. [PMID: 32535401 PMCID: PMC7426724 DOI: 10.1016/j.jmr.2020.106757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Revised: 05/12/2020] [Accepted: 05/27/2020] [Indexed: 05/05/2023]
Abstract
The tautomeric structure and chemistry of the histidine imidazole ring play active roles in many structurally and functionally important proteins and polypeptides. While in NMR spectroscopy histidine chemical shifts (e.g. 15N, 13C, and 1H) have been commonly used to characterize the tautomeric structure, hydrogen bonding, and torsion angles, homonuclear 15N scalar couplings in histidine have rarely been reported. Here, we propose double spin-echo sequences to compare the observed signals with and without a 90° pulse between the two spin-echo periods, such that their signal ratio as a function of the echo time solely depends on homonuclear scalar couplings, allowing for measuring weak homonuclear scalar couplings without influence from transverse dephasing effects, thus capable of revealing hydrogen-bond mediated 15N-15N J-couplings that can provide direct and definitive evidence for the formation of N…H…N hydrogen-bonding associated with the imidazole ring. We used two 13C,15N labeled histidine samples recrystallized from solutions at pH 6.3 and pH 11.0 to demonstrate the feasibility of this method and reveal the existence of a weak two-bond scalar coupling between the Nδ1 and Nε2 sites in the histidine imidazole ring in three tautomeric states and the presence of a hydrogen-bond mediated scalar coupling between the Nδ1 site in the imidazole ring and the backbone Nα site in the histidine neutral τ and π states. Our results demonstrate that weak 15N homonuclear scalar couplings can be measured even when their values are less than their corresponding intrinsic natural linewidths, thus providing direct and definitive evidence for the formation of N…H…N hydrogen bonding that is associated with the histidine imidazole ring.
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Affiliation(s)
- Chunhua Tan
- National High Magnet Field Lab, 1800 East Paul Dirac Drive, Tallahassee, FL 32310, USA; Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen, Fujian 361005, China
| | - Yuquan Chen
- CAS Key Laboratory of Microscale Magnetic Resonance and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
| | - Xinhua Peng
- CAS Key Laboratory of Microscale Magnetic Resonance and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
| | - Zhong Chen
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen, Fujian 361005, China
| | - Shuhui Cai
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen, Fujian 361005, China
| | - Timothy A Cross
- National High Magnet Field Lab, 1800 East Paul Dirac Drive, Tallahassee, FL 32310, USA; Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA
| | - Riqiang Fu
- National High Magnet Field Lab, 1800 East Paul Dirac Drive, Tallahassee, FL 32310, USA.
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4
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Movellan K, Wegstroth M, Overkamp K, Leonov A, Becker S, Andreas LB. Imidazole-Imidazole Hydrogen Bonding in the pH-Sensing Histidine Side Chains of Influenza A M2. J Am Chem Soc 2020; 142:2704-2708. [PMID: 31970979 PMCID: PMC7307898 DOI: 10.1021/jacs.9b10984] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Indexed: 12/28/2022]
Abstract
The arrangement of histidine side chains in influenza A M2 tetramer determines their pKa values, which define pH-controlled proton conduction critical to the virus lifecycle. Both water-associated and hydrogen-bonded imidazole-imidazolium histidine quaternary structures have been proposed, based on crystal structures and NMR chemical shifts, respectively. Here we show, using the conduction domain construct of M2 in lipid bilayers, that the imidazole rings are hydrogen bonded even at a pH of 7.8 in the neutral charge state. An intermolecular 8.9 ± 0.3 Hz 2hJNN hydrogen bond is observed between H37 Nε and Nδ recorded in a fully protonated sample with 100 kHz magic-angle spinning. This interaction could not be detected in the drug-bound sample.
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Affiliation(s)
- Kumar
Tekwani Movellan
- Department of NMR Based Structural
Biology, Max Planck Institute for Biophysical
Chemistry, Am Fassberg 11, Göttingen 37077, Germany
| | - Melanie Wegstroth
- Department of NMR Based Structural
Biology, Max Planck Institute for Biophysical
Chemistry, Am Fassberg 11, Göttingen 37077, Germany
| | - Kerstin Overkamp
- Department of NMR Based Structural
Biology, Max Planck Institute for Biophysical
Chemistry, Am Fassberg 11, Göttingen 37077, Germany
| | - Andrei Leonov
- Department of NMR Based Structural
Biology, Max Planck Institute for Biophysical
Chemistry, Am Fassberg 11, Göttingen 37077, Germany
| | - Stefan Becker
- Department of NMR Based Structural
Biology, Max Planck Institute for Biophysical
Chemistry, Am Fassberg 11, Göttingen 37077, Germany
| | - Loren B. Andreas
- Department of NMR Based Structural
Biology, Max Planck Institute for Biophysical
Chemistry, Am Fassberg 11, Göttingen 37077, Germany
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5
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Fu R, Miao Y, Qin H, Cross TA. Observation of the Imidazole-Imidazolium Hydrogen Bonds Responsible for Selective Proton Conductance in the Influenza A M2 Channel. J Am Chem Soc 2020; 142:2115-2119. [PMID: 31970982 DOI: 10.1021/jacs.9b09985] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The integral membrane M2 protein is a 97-residue membrane protein that assembles as a tetramer to conduct protons at a slow rate (102-103/s) when activated by low pH. The proton conductance mechanism has been extensively debated in the literature, but it is accepted that the proton conductance is facilitated by hydrogen bonds involving the His37 residues. However, the hydrogen bonding partnership remains unresolved. Here, we report on the measurement of 15N-15N J-couplings of 15N His37-labeled full length M2 (M2FL) protein from Influenza A virus embedded in synthetic liquid crystalline lipid bilayers using two-dimensional J-resolved NMR spectroscopy. We experimentally observed the hydrogen-bond mediated J-couplings between Nδ1 and Nε2 of adjacent His37 imidazole rings, providing direct evidence for the existence of various imidazolium-imidazole hydrogen-bonding geometries in the histidine tetrad at low pH, thus validating the proton conduction mechanism in the M2FL protein by which the proton is transferred through the breaking and reforming of the hydrogen bonds between pairs of His37 residues.
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Affiliation(s)
- Riqiang Fu
- National High Magnet Field Lab , 1800 East Paul Dirac Drive , Tallahassee , Florida 32310 , United States
| | - Yimin Miao
- Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32306 , United States
| | - Huajun Qin
- Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32306 , United States
| | - Timothy A Cross
- National High Magnet Field Lab , 1800 East Paul Dirac Drive , Tallahassee , Florida 32310 , United States.,Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32306 , United States
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6
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Webber AL, Yates JR, Zilka M, Sturniolo S, Uldry AC, Corlett EK, Pickard CJ, Pérez-Torralba M, Angeles Garcia M, Santa Maria D, Claramunt RM, Brown SP. Weak Intermolecular CH···N Hydrogen Bonding: Determination of 13CH- 15N Hydrogen-Bond Mediated J Couplings by Solid-State NMR Spectroscopy and First-Principles Calculations. J Phys Chem A 2020; 124:560-572. [PMID: 31880451 DOI: 10.1021/acs.jpca.9b10726] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Weak hydrogen bonds are increasingly hypothesized to play key roles in a wide range of chemistry from catalysis to gelation to polymer structure. Here, 15N/13C spin-echo magic-angle spinning (MAS) solid-state nuclear magnetic resonance (NMR) experiments are applied to "view" intermolecular CH···N hydrogen bonding in two selectively labeled organic compounds, 4-[15N] cyano-4'-[13C2] ethynylbiphenyl (1) and [15N3,13C6]-2,4,6-triethynyl-1,3,5-triazine (2). The synthesis of 2-15N3,13C6 is reported here for the first time via a multistep procedure, where the key element is the reaction of [15N3]-2,4,6-trichloro-1,3,5-triazine (5) with [13C2]-[(trimethylsilyl)ethynyl]zinc chloride (8) to afford its immediate precursor [15N3,13C6]-2,4,6-tris[(trimethylsilyl)ethynyl]-1,3,5-triazine (9). Experimentally determined hydrogen-bond-mediated 2hJCN couplings (4.7 ± 0.4 Hz (1) and 4.1 ± 0.3 Hz (2)) are compared with density functional theory (DFT) gauge-including projector augmented wave (GIPAW) calculations, whereby species-independent coupling values 2hKCN (29.0 × 1019 kg m-2 s-2 A-2 (1) and 27.9 × 1019 kg m-2 s-2 A-2 (2)) quantitatively demonstrate the J couplings for these "weak" CH···N hydrogen bonds to be of a similar magnitude to those for conventionally observed NH···O hydrogen-bonding interactions in uracil (2hKNO: 28.1 and 36.8 × 1019 kg m-2 s-2 A-2). Moreover, the GIPAW calculations show a clear correlation between increasing 2hJCN (and 3hJCN) coupling and reducing C(H)···N and H···N hydrogen-bonding distances, with the Fermi contact term accounting for at least 98% of the isotropic 2hJCN coupling.
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Affiliation(s)
- Amy L Webber
- Department of Physics , University of Warwick , Coventry CV4 7AL , U.K
| | - Jonathan R Yates
- Department of Materials , University of Oxford , Parks Road , Oxford OX1 3PH , U.K
| | - Miri Zilka
- Department of Physics , University of Warwick , Coventry CV4 7AL , U.K
| | - Simone Sturniolo
- Scientific Computing Department , Rutherford Appleton Laboratory , Chilton, Didcot , Oxfordshire OX11 0QX , U.K
| | - Anne-Christine Uldry
- Department for Biomedical Research , University of Bern , Freiburgstrasse 15 , Bern 3010 , Switzerland
| | - Emily K Corlett
- Department of Physics , University of Warwick , Coventry CV4 7AL , U.K
| | - Chris J Pickard
- Department of Materials Science and Metallurgy , University of Cambridge , 27 Charles Babbage Road , Cambridge CB3 0FS , U.K.,Advanced Institute for Materials Research , Tohoku University 2-1-1 Katahira , Aoba, Sendai 980-8577 , Japan
| | - Marta Pérez-Torralba
- Departamento de Química Orgánica y Bio-Orgánica , Facultad de Ciencias, UNED , Senda del Rey 9 , Madrid E-28040 , Spain
| | - M Angeles Garcia
- Departamento de Química Orgánica y Bio-Orgánica , Facultad de Ciencias, UNED , Senda del Rey 9 , Madrid E-28040 , Spain
| | - Dolores Santa Maria
- Departamento de Química Orgánica y Bio-Orgánica , Facultad de Ciencias, UNED , Senda del Rey 9 , Madrid E-28040 , Spain
| | - Rosa M Claramunt
- Departamento de Química Orgánica y Bio-Orgánica , Facultad de Ciencias, UNED , Senda del Rey 9 , Madrid E-28040 , Spain
| | - Steven P Brown
- Department of Physics , University of Warwick , Coventry CV4 7AL , U.K
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7
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Zhang W, Yoon MK, Meredith RJ, Zajicek J, Oliver AG, Hadad M, Frey MH, Carmichael I, Serianni AS. 13C- 13C spin-coupling constants in crystalline 13C-labeled saccharides: conformational effects interrogated by solid-state 13C NMR spectroscopy. Phys Chem Chem Phys 2019; 21:23576-23588. [PMID: 31621725 DOI: 10.1039/c9cp03228b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Solid-state 13C NMR spectroscopy has been used in conjunction with selectively 13C-labeled mono- and disaccharides to measure 13C-13C spin-couplings (JCC) in crystalline samples. This experimental approach allows direct correlation of JCC values with specific molecular conformations since, in crystalline samples, molecular conformation is essentially static and can be determined by X-ray crystallography. JCC values measured in the solid-state in known molecular conformations can then be compared to corresponding JCC values calculated in the same conformations using density functional theory (DFT). The latter comparisons provide important validation of DFT-calculated J-couplings, which is not easily obtained by other approaches and is fundamental to obtaining reliable experiment-based conformational models from redundant J-couplings by MA'AT analysis. In this study, representative 1JCC, 2JCCC and 3JCOCC values were studied as either intra-residue couplings in the aldohexopyranosyl rings of monosaccharides or inter-residue (trans-glycoside) couplings in disaccharides. The results demonstrate that (a) accurate JCC values can be measured in crystalline saccharides that have been suitably labeled with 13C, and (b) DFT-calculated JCC values compare favorably with those determined by solid-state 13C NMR when molecular conformation is a constant in both determinations.
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Affiliation(s)
- Wenhui Zhang
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556-5670, USA.
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8
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Thureau P, Carvin I, Ziarelli F, Viel S, Mollica G. A Karplus Equation for the Conformational Analysis of Organic Molecular Crystals. Angew Chem Int Ed Engl 2019; 58:16047-16051. [PMID: 31397043 DOI: 10.1002/anie.201906359] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 08/08/2019] [Indexed: 01/01/2023]
Abstract
Vicinal scalar couplings (3 J) are extensively used for the conformational analysis of organic compounds in the liquid state through empirical Karplus equations. In contrast, there are no examples of such use for the structural investigation of solids. With the support of first principles calculations, we demonstrate here that 13 C-13 C 3 J coupling constants (3 JCC ) measured on a series of isotopically enriched solid amino acids and sugars can be related to dihedral angles by a simple Karplus-like relationship, and we provide a parameterized Karplus function for the conformational analysis of organic molecular crystals. Under the experimental conditions discussed, torsional angles can be estimated from the experimental 3 JCC values with an accuracy of 10° using this function. These results open new perspectives towards the use of 3 JCC as a new analytical tool that could considerably simplify structure determination of functional organic solids.
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Affiliation(s)
- Pierre Thureau
- Aix Marseille Univ, CNRS, ICR UMR 7273, Marseille, France
| | - Isaure Carvin
- Aix Marseille Univ, CNRS, ICR UMR 7273, Marseille, France
| | - Fabio Ziarelli
- Aix Marseille Univ, CNRS, Centrale Marseille, FSCM, FR1739, Marseille, France
| | - Stéphane Viel
- Aix Marseille Univ, CNRS, ICR UMR 7273, Marseille, France.,Institut Universitaire de France, Paris, France
| | - Giulia Mollica
- Aix Marseille Univ, CNRS, ICR UMR 7273, Marseille, France
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9
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Thureau P, Carvin I, Ziarelli F, Viel S, Mollica G. A Karplus Equation for the Conformational Analysis of Organic Molecular Crystals. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906359] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Isaure Carvin
- Aix Marseille UnivCNRS, ICR UMR 7273 Marseille France
| | - Fabio Ziarelli
- Aix Marseille UnivCNRSCentrale Marseille, FSCM, FR1739 Marseille France
| | - Stéphane Viel
- Aix Marseille UnivCNRS, ICR UMR 7273 Marseille France
- Institut Universitaire de France Paris France
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10
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Moran RF, Dawson DM, Ashbrook SE. Exploiting NMR spectroscopy for the study of disorder in solids. INT REV PHYS CHEM 2017. [DOI: 10.1080/0144235x.2017.1256604] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Robert F. Moran
- School of Chemistry, EaStCHEM and St Andrews Centre of Magnetic Resonance, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK
| | - Daniel M. Dawson
- School of Chemistry, EaStCHEM and St Andrews Centre of Magnetic Resonance, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK
| | - Sharon E. Ashbrook
- School of Chemistry, EaStCHEM and St Andrews Centre of Magnetic Resonance, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK
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11
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Development and application of novel NMR methodologies for the in situ characterization of crystallization processes of metastable crystalline materials. ACTA ACUST UNITED AC 2016. [DOI: 10.1515/zkri-2016-1975] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In this contribution we report on the development and application of modern NMR approaches for the in situ characterization of the crystallization of metastable materials. The work was performed within the framework of the DFG priority programme SPP 1415 “Crystalline Non-Equilibrium Phases”. As one of the goals of this project, the development of a NMR methodology which enables an analysis of local structural motifs on short (1–2 Å) and extended (2–6 Å) length scales without the need for fast magic angle spinning (MAS) has been defined, since the enormous centripetal forces which occur during fast sample rotation (up to 107 g) may intervene with the chemical or physical process which is being monitored. To achieve this goal, we developed a magic angle turning probe and pulse sequences allowing to trace the isotropic chemical shifts and heteronuclear dipolar couplings and hence the determination of structural motifs on short and intermediate length scales. With the implementation of novel inductive heating approaches the range of accessible rotation frequencies for in situ high temperature NMR measurements has been enlarged, now covering the ν
MAS range of 0–10 kHz with an accessible temperature of up to 700°C. Application of NMR methodologies for the characterization of crystallization processes and the structure and dynamics of novel phases, partially in joint collaborations within the priority program, are also reported.
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12
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Structural analysis of molybdo-zinc-phosphate glasses: Neutron scattering, FTIR, Raman scattering, MAS NMR studies. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.03.088] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Sanz Camacho P, McKay D, Dawson DM, Kirst C, Yates JR, Green TFG, Cordes DB, Slawin AMZ, Woollins JD, Ashbrook SE. Investigating Unusual Homonuclear Intermolecular “Through-Space” J Couplings in Organochalcogen Systems. Inorg Chem 2016; 55:10881-10887. [DOI: 10.1021/acs.inorgchem.6b01121] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Paula Sanz Camacho
- School of Chemistry, EaStCHEM and Centre
of Magnetic Resonance, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
| | - David McKay
- School of Chemistry, EaStCHEM and Centre
of Magnetic Resonance, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
| | - Daniel M. Dawson
- School of Chemistry, EaStCHEM and Centre
of Magnetic Resonance, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
| | - Christin Kirst
- School of Chemistry, EaStCHEM and Centre
of Magnetic Resonance, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
| | | | | | - David B. Cordes
- School of Chemistry, EaStCHEM and Centre
of Magnetic Resonance, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
| | - Alexandra M. Z. Slawin
- School of Chemistry, EaStCHEM and Centre
of Magnetic Resonance, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
| | - J. Derek Woollins
- School of Chemistry, EaStCHEM and Centre
of Magnetic Resonance, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
| | - Sharon E. Ashbrook
- School of Chemistry, EaStCHEM and Centre
of Magnetic Resonance, University of St Andrews, St Andrews, Fife KY16 9ST, U.K
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14
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Southern SA, Bryce DL. NMR Investigations of Noncovalent Carbon Tetrel Bonds. Computational Assessment and Initial Experimental Observation. J Phys Chem A 2015; 119:11891-9. [PMID: 26562616 DOI: 10.1021/acs.jpca.5b10848] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Group IV tetrel elements may act as tetrel bond donors, whereby a region of positive electrostatic potential (σ-hole) interacts with a Lewis base. The results of calculations of NMR parameters are reported for a series of model compounds exhibiting tetrel bonding from a methyl carbon to the oxygen or nitrogen atoms in various functional groups. The (13)C chemical shift (δiso) and the (1c)J((13)C,Y) coupling (Y = (17)O, (15)N) across the tetrel bond are recorded as a function of geometry. The sensitivity of the NMR parameters to the noncovalent interaction is demonstrated via an increase in δiso and in |(1c)J((13)C,Y)| as the tetrel bond shortens. Gauge-including projector-augmented wave density functional theory (DFT) calculations of δiso are reported for crystals that exhibit tetrel bonding in the solid state. Experimental δiso values for solid sarcosine and its tetrel-bonded salts corroborate the computational findings. This work offers new insights into tetrel bonding and facilitates the incorporation of tetrel bonds as restraints in NMR crystallographic structure refinement.
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Affiliation(s)
- Scott A Southern
- Department of Chemistry and Biomolecular Sciences & Centre for Catalysis Research and Innovation, University of Ottawa , 10 Marie Curie Private, Ottawa, Ontario K1N 6N5, 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 K1N 6N5, Canada
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15
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Feldmann KO, Wiegand T, Ren J, Eckert H, Breternitz J, Groh MF, Müller U, Ruck M, Maryasin B, Ochsenfeld C, Schön O, Karaghiosoff K, Weigand JJ. [P3Se4](+): A Binary Phosphorus-Selenium Cation. Chemistry 2015; 21:9697-712. [PMID: 25960373 DOI: 10.1002/chem.201406476] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Indexed: 11/07/2022]
Abstract
Although a fairly large number of binary group 15/16 element cations have been reported, no example involving phosphorus in combination with a group 16 element has been synthesized and characterized to date. In this contribution is reported the synthesis and structural characterization of the first example of such a cation, namely a nortricyclane-type [P3Se4](+). This cation has been independently discovered by three groups through three different synthetic routes, as described herein. The molecular and electronic structure of the [P3Se4](+) cage and its crystal properties in the solid state have been characterized comprehensively by using X-ray diffraction, Raman, and nuclear magnetic resonance spectroscopies, as well as quantum chemical calculations.
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Affiliation(s)
- Kai-Oliver Feldmann
- Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden (Germany)
| | - Thomas Wiegand
- Department of Physical Chemistry, Westfälische Wilhelms-University Münster, 48149 Münster (Germany). .,Laboratorium für Physikalische Chemie, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich (Switzerland).
| | - Jinjun Ren
- Department of Physical Chemistry, Westfälische Wilhelms-University Münster, 48149 Münster (Germany)
| | - Hellmut Eckert
- Department of Physical Chemistry, Westfälische Wilhelms-University Münster, 48149 Münster (Germany). .,Institute of Physics in Sao Carlos, University of Sao Paulo, Sao Carlos, SP 13560-970, Brazil.
| | - Joachim Breternitz
- Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden (Germany)
| | - Matthias F Groh
- Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden (Germany)
| | - Ulrike Müller
- Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden (Germany)
| | - Michael Ruck
- Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden (Germany).
| | - Boris Maryasin
- Department of Chemistry, University of Munich (LMU), 81377 Munich (Germany)
| | | | - Oliver Schön
- Department of Chemistry, University of Munich (LMU), 81377 Munich (Germany)
| | | | - Jan J Weigand
- Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden (Germany).
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16
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Kakita VMR, Kupče E, Bharatam J. Solid-state Hadamard NMR spectroscopy: simultaneous measurements of multiple selective homonuclear scalar couplings. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2015; 251:8-12. [PMID: 25554944 DOI: 10.1016/j.jmr.2014.11.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Revised: 11/10/2014] [Accepted: 11/16/2014] [Indexed: 06/04/2023]
Abstract
Unambiguous measurement of homonuclear scalar couplings (J) in multi-spin scalar network systems is not straightforward. Further, the direct measurement of J-couplings is obscured in solid-state samples due to the dipolar and chemical shift anisotropy (CSA)-dominated line broadening, even under the magic angle spinning (MAS). We present a new multiple frequency selective spin-echo method based on Hadamard matrix encoding, for simultaneous measurement of multiple homonuclear scalar couplings (J) in the solid-state. In contrast to the Hadamard encoded selective excitation schemes known for the solution-state, herein the selectivity is achieved during refocusing period. The Hadamard encoded refocusing scheme concurrently allows to create the spin-spin commutation property between number of spin-pairs of choice in uniformly labelled molecules, which, therefore avoids (1) the repetition of the double selective refocusing experiments for each spin-pair and (2) the synthesis of expensive selective labelled molecules. The experimental scheme is exemplified for determining (1)JCC and (3)JCC values in (13)C6l-Histidine.HCl molecule, which are found to be in excellent agreement with those measured in conventional double frequency selective refocusing mode as well as in the solution-state. This method can be simply extended to 2D/3D pulse schemes and be applied to small bio-molecular solids.
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Affiliation(s)
- Veera Mohana Rao Kakita
- Centre for NMR & Structural Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - Eriks Kupče
- Bruker UK Limited, Banner Lane, Coventry CV4 9GH, UK
| | - Jagadeesh Bharatam
- Centre for NMR & Structural Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India.
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17
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Perras FA, Bryce DL. Theoretical study of homonuclear J coupling between quadrupolar spins: single-crystal, DOR, and J-resolved NMR. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2014; 242:23-32. [PMID: 24594753 DOI: 10.1016/j.jmr.2014.01.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Revised: 01/12/2014] [Accepted: 01/20/2014] [Indexed: 06/03/2023]
Abstract
The theory describing homonuclear indirect nuclear spin-spin coupling (J) interactions between pairs of quadrupolar nuclei is outlined and supported by numerical calculations. The expected first-order multiplets for pairs of magnetically equivalent (A2), chemically equivalent (AA'), and non-equivalent (AX) quadrupolar nuclei are given. The various spectral changeovers from one first-order multiplet to another are investigated with numerical simulations using the SIMPSON program and the various thresholds defining each situation are given. The effects of chemical equivalence, as well as quadrupolar coupling, chemical shift differences, and dipolar coupling on double-rotation (DOR) and J-resolved NMR experiments for measuring homonuclear J coupling constants are investigated. The simulated J coupling multiplets under DOR conditions largely resemble the ideal multiplets predicted for single crystals, and a characteristic multiplet is expected for each of the A2, AA', and AX cases. The simulations demonstrate that it should be straightforward to distinguish between magnetic inequivalence and equivalence using J-resolved NMR, as was speculated previously. Additionally, it is shown that the second-order quadrupolar-dipolar cross-term does not affect the splittings in J-resolved experiments. Overall, the homonuclear J-resolved experiment for half-integer quadrupolar nuclei is demonstrated to be robust with respect to the effects of first- and second-order quadrupolar coupling, dipolar coupling, and chemical shift differences.
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Affiliation(s)
- Frédéric A Perras
- Department of Chemistry and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie Private, Ottawa, Ontario K1N 6N5, Canada
| | - David L Bryce
- Department of Chemistry and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie Private, Ottawa, Ontario K1N 6N5, Canada.
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18
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Bischoff C, Schuller K, Dunlap N, Martin SW. IR, Raman, and NMR studies of the short-range structures of 0.5Na2S + 0.5[xGeS2 + (1-x)PS(5/2)] mixed glass-former glasses. J Phys Chem B 2014; 118:1943-53. [PMID: 24447260 DOI: 10.1021/jp4111053] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A nonlinear and nonadditive composition-dependent change of the ionic conductivity in mixed glass-former (MGF) glasses when one glass former, such as PS(5/2), is replaced by a second glass former, such as GeS2, at constant alkali modifier concentrations, such as Na2S, is known as the mixed glass-former effect (MGFE). Alkali ion conducting glasses are of particular interest for use as solid electrolytes in alkali-based all-solid-state batteries because sulfide amorphous materials have significantly higher alkali ion conductivities than their oxide glass counterparts. In this study of the ternary MGF system Na2S + GeS2 + PS(5/2), we report the careful structural characterization of these glasses using a combination of vibrational, infrared (IR), Raman, and nuclear magnetic resonance (NMR) spectroscopies. Our measurements of the 0.5Na2S + 0.5[xGeS2 + (1-x)PS(5/2)] MGF system show that this glass system exhibits a strongly negative MGFE and non-Arrhenius ionic conductivities. While this negative MGFE in the Na(+) ion conductivity makes these glasses less attractive for use in solid-state Na batteries, the structural origin of this effect is important to better understand the mechanisms of ion conduction in the glassy state. For these reasons, we have examined the structures of ternary 0.5Na2S + 0.5[xGeS2 + (1-x)PS(5/2)] glasses using Raman, IR, and (31)P MAS NMR spectroscopies. In these studies, it is found that the substitution of PS(5/2) by GeS2, that is, increasing x, leads to unequal sharing of the Na(+) in these glasses. Thus, in all MGF compositions, phosphorus groups are associated with a disproportionately larger fraction, f(Na(P)) > 0.5(1 - x), of the Na(+) ions while the germanium groups are found to be Na(+)-deficient relative to the total amount of Na(+) present in the glass, that is, f(Na(Ge)) < 0.5x. From the spectroscopic study of these glasses, a short-range order (SRO) structural model is developed for these glasses and is based on the germanium and phosphorus SRO groups in these glasses as a first step in understanding the unique negative MGFE and non-Arrhenius behavior in the Na(+) ion conductivity in these glasses.
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Affiliation(s)
- Christian Bischoff
- Department of Materials Science and Engineering, Iowa State University of Science & Technology , Ames, Iowa 50011, United States
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19
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Viger-Gravel J, Meyer JE, Korobkov I, Bryce DL. Probing halogen bonds with solid-state NMR spectroscopy: observation and interpretation of J(77Se,31P) coupling in halogen-bonded PSe⋯I motifs. CrystEngComm 2014. [DOI: 10.1039/c4ce00345d] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Intra-halogen bond J couplings measured via NMR spectroscopy and interpreted using natural localized molecular orbitals offer novel insights into this class of non-covalent interaction.
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Affiliation(s)
- Jasmine Viger-Gravel
- Department of Chemistry and Center for Catalysis Research and Innovation
- University of Ottawa
- Ottawa, Canada
| | - Julia E. Meyer
- Department of Chemistry and Center for Catalysis Research and Innovation
- University of Ottawa
- Ottawa, Canada
| | - Ilia Korobkov
- Department of Chemistry and Center for Catalysis Research and Innovation
- University of Ottawa
- Ottawa, Canada
| | - David L. Bryce
- Department of Chemistry and Center for Catalysis Research and Innovation
- University of Ottawa
- Ottawa, Canada
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20
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Thureau P, Mollica G, Ziarelli F, Viel S. Selective measurements of long-range homonuclear J-couplings in solid-state NMR. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2013; 231:90-94. [PMID: 23608042 DOI: 10.1016/j.jmr.2013.03.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Revised: 03/17/2013] [Accepted: 03/23/2013] [Indexed: 06/02/2023]
Abstract
We demonstrate here that the principle of frequency-selective spin-echoes can be extended to the measurements of long-range homonuclear scalar J-couplings in the solid-state. Singly or doubly frequency-selective pulses were used to generate either a J-modulated experiment (S) or a reference experiment (S0). The combination of these two distinct experiments provides experimental data that, in favorable cases, are insensitive to incoherent relaxation effects, and which can be used to estimate long-range homonuclear J-couplings in multiple spin-systems. The concept is illustrated in the case of a uniformly (13)C and (15)N labeled sample of L-histidine, where the absolute value of homonuclear J-couplings between two spins separated by one, two or three covalent bonds are measured. Moreover, we show that a (2)J((15)N-C-(15)N) coupling as small as 0.9 Hz can be precisely measured with the method presented here.
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Affiliation(s)
- Pierre Thureau
- Aix-Marseille Univ., CNRS, UMR 7273: Institut de Chimie Radicalaire, 13397 Marseille, France.
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21
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Brouwer DH, Cadars S, Eckert J, Liu Z, Terasaki O, Chmelka BF. A general protocol for determining the structures of molecularly ordered but noncrystalline silicate frameworks. J Am Chem Soc 2013; 135:5641-55. [PMID: 23560776 DOI: 10.1021/ja311649m] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A general protocol is demonstrated for determining the structures of molecularly ordered but noncrystalline solids, which combines constraints provided by X-ray diffraction (XRD), one- and two-dimensional solid-state nuclear magnetic resonance (NMR) spectroscopy, and first-principles quantum chemical calculations. The approach is used to determine the structure(s) of a surfactant-directed layered silicate with short-range order in two dimensions but without long-range periodicity in three-dimensions (3D). The absence of long-range 3D molecular order and corresponding indexable XRD reflections precludes determination of a space group for this layered silicate. Nevertheless, by combining structural constraints obtained from solid-state (29)Si NMR analyses, including the types and relative populations of distinct (29)Si sites, their respective (29)Si-O-(29)Si connectivities and separation distances, with unit cell parameters (though not space group symmetry) provided by XRD, a comprehensive search of candidate framework structures leads to the identification of a small number of candidate structures that are each compatible with all of the experimental data. Subsequent refinement of the candidate structures using density functional theory calculations allows their evaluation and identification of "best" framework representations, based on their respective lattice energies and quantitative comparisons between experimental and calculated (29)Si isotropic chemical shifts and (2)J((29)Si-O-(29)Si) scalar couplings. The comprehensive analysis identifies three closely related and topologically equivalent framework configurations that are in close agreement with all experimental and theoretical structural constraints. The subtle differences among such similar structural models embody the complexity of the actual framework(s), which likely contain coexisting or subtle distributions of structural order that are intrinsic to the material.
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Affiliation(s)
- Darren H Brouwer
- Department of Chemistry, Redeemer University College, Ancaster, Ontario, Canada, L9K 1J4
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22
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Wang Q, Trébosc J, Li Y, Xu J, Hu B, Feng N, Chen Q, Lafon O, Amoureux JP, Deng F. Signal enhancement of J-HMQC experiments in solid-state NMR involving half-integer quadrupolar nuclei. Chem Commun (Camb) 2013; 49:6653-5. [DOI: 10.1039/c3cc42961j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Larink D, Ren J, Eckert H. Spectral editing based on scalar spin-spin interactions: new results on the structure of metathiophosphate glasses. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2012; 45-46:30-35. [PMID: 22664187 DOI: 10.1016/j.ssnmr.2012.05.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Accepted: 05/09/2012] [Indexed: 06/01/2023]
Abstract
The local structure of glassy NaPS(3) and AgPS(3) was analyzed based on quantitative (31)P MAS-NMR spectroscopy. The glasses contain some oxide impurities, which could be quantified from the NMR spectral analysis. Four discrete resonances are observed in both glasses, which were assigned to four distinct types of phosphate groups P((n)), where n is the number of P-S-P bridges(i.e., P((0)), P((1)), P((2)), and P((3)) units, respectively) with the help of 2D homonuclear J-resolved and INADEQUATE methods. Based on the results obtained, the interpretations of previous spectra obtained at low spinning speeds on lithium and silver thiophosphate glasses (Chem. Mater. 2 (1990), 273, and J. Am. Chem. Soc. 114 (1992), 5775) need to be revised. Contrary to the situation in alkali phosphate glasses, the corresponding sulfide analogs are characterized by a wide P((n)) species distribution close to that predicted by a statistical charge distribution. INADEQUATE experiments fail to detect P((n))-P((n-1)) connectivities, suggesting that the structure of these glasses is rather inhomogeneous, possibly featuring the different P((n)) species in segregated domains.
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Affiliation(s)
- Dirk Larink
- Institut für Physikalische Chemie, WWU Münster, Münster, Germany
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24
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25
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Webber AL, Masiero S, Pieraccini S, Burley JC, Tatton AS, Iuga D, Pham TN, Spada GP, Brown SP. Identifying guanosine self assembly at natural isotopic abundance by high-resolution 1H and 13C solid-state NMR spectroscopy. J Am Chem Soc 2011; 133:19777-95. [PMID: 22034827 DOI: 10.1021/ja206516u] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
By means of the (1)H chemical shifts and the proton-proton proximities as identified in (1)H double-quantum (DQ) combined rotation and multiple-pulse spectroscopy (CRAMPS) solid-state NMR correlation spectra, ribbon-like and quartet-like self-assembly can be identified for guanosine derivatives without isotopic labeling for which it was not possible to obtain single crystals suitable for diffraction. Specifically, characteristic spectral fingerprints are observed for dG(C10)(2) and dG(C3)(2) derivatives, for which quartet-like and ribbon-like self-assembly has been unambiguously identified by (15)N refocused INADEQUATE spectra in a previous study of (15)N-labeled derivatives (Pham, T. N.; et al. J. Am. Chem. Soc.2005, 127, 16018). The NH (1)H chemical shift is observed to be higher (13-15 ppm) for ribbon-like self-assembly as compared to 10-11 ppm for a quartet-like arrangement, corresponding to a change from NH···N to NH···O intermolecular hydrogen bonding. The order of the two NH(2)(1)H chemical shifts is also inverted, with the NH(2) proton closest in space to the NH proton having a higher or lower (1)H chemical shift than that of the other NH(2) proton for ribbon-like as opposed to quartet-like self-assembly. For the dG(C3)(2) derivative for which a single-crystal diffraction structure is available, the distinct resonances and DQ peaks are assigned by means of gauge-including projector-augmented wave (GIPAW) chemical shift calculations. In addition, (14)N-(1)H correlation spectra obtained at 850 MHz under fast (60 kHz) magic-angle spinning (MAS) confirm the assignment of the NH and NH(2) chemical shifts for the dG(C3)(2) derivative and allow longer range through-space N···H proximities to be identified, notably to the N7 nitrogens on the opposite hydrogen-bonding face.
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Affiliation(s)
- Amy L Webber
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
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26
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Becker-Baldus J, Kemp TF, Past J, Reinhold A, Samoson A, Brown SP. Longer-range distances by spinning-angle-encoding solid-state NMR spectroscopy. Phys Chem Chem Phys 2011; 13:4514-8. [DOI: 10.1039/c0cp02364g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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27
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Yates JR. Prediction of NMR J-coupling in solids with the planewave pseudopotential approach. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2010; 48 Suppl 1:S23-S31. [PMID: 20625980 DOI: 10.1002/mrc.2646] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We review the calculation of NMR J-coupling in solid materials using the planewave pseudopotential formalism of Density Functional Theory. The methodology is briefly summarised and an account of recent applications is given. We discuss various aspects of the calculations which should be taken into account when comparing results with solid-state NMR experiments including anisotropy and orientation of the J tensors, the reduced coupling constant, and the relation between J and crystal structure.
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Affiliation(s)
- Jonathan R Yates
- Department of Materials, University of Oxford, Oxford OX1 3PH, UK.
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28
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Griffin JM, Yates JR, Berry AJ, Wimperis S, Ashbrook SE. High-Resolution 19F MAS NMR Spectroscopy: Structural Disorder and Unusual J Couplings in a Fluorinated Hydroxy-Silicate. J Am Chem Soc 2010; 132:15651-60. [DOI: 10.1021/ja105347q] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- John M. Griffin
- School of Chemistry and EaStCHEM, University of St. Andrews, North Haugh, St. Andrews KY16 9ST, U.K., Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K., Department of Earth Sciences and Engineering, Imperial College London, South Kensington SW7 2AZ, U.K., Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, U.K., and School of Chemistry and WestCHEM, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Jonathan R. Yates
- School of Chemistry and EaStCHEM, University of St. Andrews, North Haugh, St. Andrews KY16 9ST, U.K., Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K., Department of Earth Sciences and Engineering, Imperial College London, South Kensington SW7 2AZ, U.K., Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, U.K., and School of Chemistry and WestCHEM, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Andrew J. Berry
- School of Chemistry and EaStCHEM, University of St. Andrews, North Haugh, St. Andrews KY16 9ST, U.K., Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K., Department of Earth Sciences and Engineering, Imperial College London, South Kensington SW7 2AZ, U.K., Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, U.K., and School of Chemistry and WestCHEM, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Stephen Wimperis
- School of Chemistry and EaStCHEM, University of St. Andrews, North Haugh, St. Andrews KY16 9ST, U.K., Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K., Department of Earth Sciences and Engineering, Imperial College London, South Kensington SW7 2AZ, U.K., Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, U.K., and School of Chemistry and WestCHEM, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Sharon E. Ashbrook
- School of Chemistry and EaStCHEM, University of St. Andrews, North Haugh, St. Andrews KY16 9ST, U.K., Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K., Department of Earth Sciences and Engineering, Imperial College London, South Kensington SW7 2AZ, U.K., Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, U.K., and School of Chemistry and WestCHEM, University of Glasgow, Glasgow G12 8QQ, U.K
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29
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Claramunt RM, Pérez-Torralba M, María DS, Sanz D, Elena B, Alkorta I, Elguero J. 15N-15N spin-spin coupling constants through intermolecular hydrogen bonds in the solid state. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2010; 206:274-279. [PMID: 20716491 DOI: 10.1016/j.jmr.2010.07.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2010] [Revised: 07/13/2010] [Accepted: 07/25/2010] [Indexed: 05/29/2023]
Abstract
A 2hJNN intermolecular spin-spin coupling constant (SSCC) of 10.2±0.4 Hz has been measured for the powdered tetrachlorogallate salt of pyridinium solvated by pyridine (pyridine-H+⋯pyridine cation 3). Density Functional Theory (DFT) calculations at the B3LYP/6-311++G(d,p) level reproduced this value and two others reported in the literature for 2hJ intermolecular SSCCs, which were measured for complexes in solution.
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Affiliation(s)
- Rosa M Claramunt
- Departamento de Química Orgánica y Bio-Orgánica, Facultad de Ciencias, UNED, Senda del Rey 9, E-28040 Madrid, Spain.
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30
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Xue X. Determination of J coupling constants between spin-1/2 and quadrupolar nuclei in inorganic solids from spin echo and refocused INEPT experiments: a case study on AlPO₄ berlinite. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2010; 38:62-73. [PMID: 21030218 DOI: 10.1016/j.ssnmr.2010.09.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2010] [Revised: 08/02/2010] [Accepted: 09/14/2010] [Indexed: 05/30/2023]
Abstract
A systematic study utilizing rotor-synchronized homonuclear ((31)P, (27)Al) and heteronuclear ({(31)P}(27)Al and {(27)Al}(31)P) spin echo, and {(27)Al}(31)P refocused INEPT experiments (employing soft pulses for selective excitation of the central transition for the quadrupolar (27)Al (I=5/2)) have been performed on AlPO(4) berlinite at 30 kHz MAS to better understand the J modulation behavior involving half-integer quadrupolar nuclei in solid materials with framework structure. Analyses of the J modulation on either the (27)Al or (31)P coherence in both the {(31)P}(27)Al and {(27)Al}(31)P spin echo experiments, and both periods of the refocused INEPT experiment yield consistent results for the (2)J(AlP) (Al-O-P) coupling constant (ca. 25 Hz). It is noted that the coupling of each (27)Al to four (31)P spins during the first ((27)Al) evolution period of the refocused INEPT, and the populations of (31)P coupled to different numbers (0-4) of (27)Al in the ± 1/2 Zeeman states during (31)P coherence evolution, which have been neglected in previous studies, must be taken into account for proper treatment. Analysis of J modulation on the spin ((27)Al) coupled to spin-1/2 nuclei in general gives more accurate results. Weak long-range homonuclear (4)J(PP) (P-O-Al-O-P) coupling was also observed from the (31)P spin echo and INADEQUATE experiments.
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Affiliation(s)
- Xianyu Xue
- Institute for Study of the Earth's Interior, Okayama University, Yamada 827, Misasa, Tottori 682-0193, Japan.
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31
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Agarwal V, Linser R, Fink U, Faelber K, Reif B. Identification of Hydroxyl Protons, Determination of Their Exchange Dynamics, and Characterization of Hydrogen Bonding in a Microcrystallin Protein. J Am Chem Soc 2010; 132:3187-95. [DOI: 10.1021/ja910167q] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vipin Agarwal
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Robert-Rössle-Str. 10, D-13125 Berlin, Germany, and Charité Universitätsmedizin, D-10115 Berlin, Germany
| | - Rasmus Linser
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Robert-Rössle-Str. 10, D-13125 Berlin, Germany, and Charité Universitätsmedizin, D-10115 Berlin, Germany
| | - Uwe Fink
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Robert-Rössle-Str. 10, D-13125 Berlin, Germany, and Charité Universitätsmedizin, D-10115 Berlin, Germany
| | - Katja Faelber
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Robert-Rössle-Str. 10, D-13125 Berlin, Germany, and Charité Universitätsmedizin, D-10115 Berlin, Germany
| | - Bernd Reif
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Robert-Rössle-Str. 10, D-13125 Berlin, Germany, and Charité Universitätsmedizin, D-10115 Berlin, Germany
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32
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Pietrzak M, Wehling J, Kong S, Tolstoy P, Shenderovich I, López C, Claramunt RM, Elguero J, Denisov G, Limbach HH. Symmetrization of Cationic Hydrogen Bridges of Protonated Sponges Induced by Solvent and Counteranion Interactions as Revealed by NMR Spectroscopy. Chemistry 2010; 16:1679-90. [DOI: 10.1002/chem.200902259] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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33
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Cavadini S. Indirect detection of nitrogen-14 in solid-state NMR spectroscopy. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2010; 56:46-77. [PMID: 20633348 DOI: 10.1016/j.pnmrs.2009.08.001] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2009] [Accepted: 08/12/2009] [Indexed: 05/29/2023]
Affiliation(s)
- Simone Cavadini
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, Batochime, Lausanne, Switzerland.
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Massiot D, Fayon F, Deschamps M, Cadars S, Florian P, Montouillout V, Pellerin N, Hiet J, Rakhmatullin A, Bessada C. Detection and use of small J couplings in solid state NMR experiments. CR CHIM 2010. [DOI: 10.1016/j.crci.2009.05.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bytchkov A, Fayon F, Massiot D, Hennet L, Price DL. 31P solid-state NMR studies of the short-range order in phosphorus–selenium glasses. Phys Chem Chem Phys 2010; 12:1535-42. [DOI: 10.1039/b919118f] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Bryce DL, Courchesne NMD, Perras FA. Measurement of delta(1)J((199)Hg, (31)P) in [HgPCy3(OAc)2]2 and relativistic ZORA DFT investigations of mercury-phosphorus coupling tensors. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2009; 36:182-191. [PMID: 20056396 DOI: 10.1016/j.ssnmr.2009.11.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2009] [Revised: 10/29/2009] [Accepted: 11/25/2009] [Indexed: 05/28/2023]
Abstract
Using 31P solid-state NMR spectroscopy, anisotropy in the indirect 199Hg-31P spin-spin coupling tensor (DeltaJ) for powdered [HgPCy3(OAc)2]2 (1) has been measured as 4700 +/- 300 Hz. Zeroth-order regular approximation (ZORA) density functional theory (DFT) calculations, including scalar and spin-orbit relativistic effects, performed on 1 and a series of other related compounds show that DeltaJ(199Hg, (31)P) arises entirely from the ZORA Fermi-contact-spin-dipolar cross term. The calculations validate assumptions made in the spectral analysis of 1 and in previous determinations of DeltaJ in powder samples, namely that J is axially symmetric and shares its principal axis system with the direct dipolar coupling tensor (D). Agreement between experiment and theory for various 199Hg, 31P spin-spin coupling anisotropies is reasonable; however, experimental values of 1J(199Hg, 31P)(iso) are significantly underestimated by the calculations. The most important improvements in the agreement were obtained as a result of including more of the crystal lattice in the model used for the calculations, e.g., a change of 43% was noted for 1J(199Hg, 31P)(iso) in [HgPPh3(NO3)2]2 depending on whether the two or three nearest nitrate ions are included in the model. Finally, we have written a computer program to simulate the effects of non-axial symmetry in J and of non-coincidence of the J and D on powder NMR spectra. Simulations clearly show that both of these effects have a pronounced impact on the 31P NMR spectrum of 199Hg-31P spin pairs, suggesting that the effects should be observable experimentally if a suitable compound can be identified.
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Affiliation(s)
- David L Bryce
- Department of Chemistry and Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, Ontario, Canada K1N6N5.
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Guerry P, Smith ME, Brown SP. 31P MAS Refocused INADEQUATE Spin−Echo (REINE) NMR Spectroscopy: Revealing J Coupling and Chemical Shift Two-Dimensional Correlations in Disordered Solids. J Am Chem Soc 2009; 131:11861-74. [DOI: 10.1021/ja902238s] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Paul Guerry
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K
| | - Mark E. Smith
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K
| | - Steven P. Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K
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38
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Brown SP. Recent Advances in Solid-State MAS NMR Methodology for Probing Structure and Dynamics in Polymeric and Supramolecular Systems. Macromol Rapid Commun 2009; 30:688-716. [DOI: 10.1002/marc.200800816] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2008] [Accepted: 02/06/2009] [Indexed: 01/12/2023]
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39
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Hung I, Uldry AC, Becker-Baldus J, Webber AL, Wong A, Smith ME, Joyce SA, Yates JR, Pickard CJ, Dupree R, Brown SP. Probing Heteronuclear 15N−17O and 13C−17O Connectivities and Proximities by Solid-State NMR Spectroscopy. J Am Chem Soc 2009; 131:1820-34. [DOI: 10.1021/ja805898d] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Ivan Hung
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Anne-Christine Uldry
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Johanna Becker-Baldus
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Amy L. Webber
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Alan Wong
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Mark E. Smith
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Siân A. Joyce
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Jonathan R. Yates
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Chris J. Pickard
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Ray Dupree
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Steven P. Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
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40
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Seyfarth L, Senker J. An NMR crystallographic approach for the determination of the hydrogen substructure of nitrogen bonded protons. Phys Chem Chem Phys 2009; 11:3522-31. [DOI: 10.1039/b819319c] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Mafra L, Gomes JRB, Trébosc J, Rocha J, Amoureux JP. 1H-1H double-quantum CRAMPS NMR at very-fast MAS (nuR=35 kHz): a resolution enhancement method to probe 1H-1H proximities in solids. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2009; 196:88-91. [PMID: 18977161 DOI: 10.1016/j.jmr.2008.10.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2008] [Revised: 09/30/2008] [Accepted: 10/02/2008] [Indexed: 05/27/2023]
Abstract
A High-resolution two-dimensional (2D) (1)H double-quantum (DQ) homonuclear recoupling experiments, combined with smooth amplitude-modulation (SAM) homonuclear decoupling is presented. The experiment affords highly resolved and clean (1)H DQ-SQ 2D spectra at very-fast MAS rates (nu(R)=35 kHz). The method is well suited to probe (1)H-(1)H distances in powdered solids and demonstrations are applied on a NaH(2)PO(4) powdered sample, an inorganic compound having hydrogen bonding networks.
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Affiliation(s)
- Luís Mafra
- Department of Chemistry, University of Aveiro, Campus de Santiago, CICECO, 3810-193 Aveiro, Portugal.
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42
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Cadars S, Brouwer DH, Chmelka BF. Probing local structures of siliceous zeolite frameworks by solid-state NMR and first-principles calculations of 29Si–O–29Si scalar couplings. Phys Chem Chem Phys 2009; 11:1825-37. [DOI: 10.1039/b815361b] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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43
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Lesage A. Recent advances in solid-state NMR spectroscopy of spin I = 1/2 nuclei. Phys Chem Chem Phys 2009; 11:6876-91. [DOI: 10.1039/b907733m] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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44
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Novel bicyclic hexanuclear copper(I) aggregate: Structure and solid state 31P CPMAS NMR spectra of [(Cu3L3)2] and [Cu(PPh3)2L] complexes of N-(diisopropoxythiophosphinyl)-N′-phenylthiourea (HL). J Organomet Chem 2009. [DOI: 10.1016/j.jorganchem.2008.10.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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45
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Joyce SA, Yates JR, Pickard CJ, Brown SP. Density Functional Theory Calculations of Hydrogen-Bond-Mediated NMR J Coupling in the Solid State. J Am Chem Soc 2008; 130:12663-70. [DOI: 10.1021/ja800419m] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Siân A. Joyce
- Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., and Department of Physics, University of Warwick, Coventry CV4 7AL, U.K
| | - Jonathan R. Yates
- Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., and Department of Physics, University of Warwick, Coventry CV4 7AL, U.K
| | - Chris J. Pickard
- Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., and Department of Physics, University of Warwick, Coventry CV4 7AL, U.K
| | - Steven P. Brown
- Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., and Department of Physics, University of Warwick, Coventry CV4 7AL, U.K
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46
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Lopez del Amo JM, Langer U, Torres V, Buntkowsky G, Vieth HM, Pérez-Torralba M, Sanz D, Claramunt RM, Elguero J, Limbach HH. NMR studies of ultrafast intramolecular proton tautomerism in crystalline and amorphous n,n'-diphenyl-6-aminofulvene-1-aldimine: solid-state, kinetic isotope, and tunneling effects. J Am Chem Soc 2008; 130:8620-32. [PMID: 18597427 DOI: 10.1021/ja801506n] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Using solid-state NMR spectroscopy, we have detected and characterized ultrafast intramolecular proton tautomerism in the N-H-N hydrogen bonds of solid N, N'-diphenyl-6-aminofulvene-1-aldimine ( I) on the microsecond-to-picosecond time scale. (15)N cross-polarization magic-angle-spinning NMR experiments using (1)H decoupling performed on polycrystalline I- (15)N 2 and the related compound N-phenyl- N'-(1,3,4-triazole)-6-aminofulvene-1-aldimine ( II) provided information about the thermodynamics of the tautomeric processes. We found that II forms only a single tautomer but that the gas-phase degeneracy of the two tautomers of I is lifted by solid-state interactions. Rate constants, including H/D kinetic isotope effects (KIEs), on the microsecond-to-picosecond time scale were obtained by measuring and analyzing the longitudinal (15)N and (2)H relaxation times of I- (15)N 2, I- (15)N 2- d 10, and I- (15)N 2- d 1 over a wide temperature range. In addition to the microcrystalline modification, a novel amorphous modification of I was found and studied. In this modification, proton transfer is much faster than in the crystalline form. For both modifications, we observed large H/D KIEs that were temperature-dependent at high temperatures and temperature-independent at low temperatures. These findings are interpreted in terms of a simple quasiclassical tunneling model proposed by Bell and modified by Limbach. We obtained evidence that a reorganization energy is necessary in order to compress the N-H-N hydrogen bond and achieve a molecular configuration in which the barrier for H transfer is reduced and tunneling or an over-barrier reaction can occur.
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47
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Alkorta I, Elguero J, Denisov GS. A review with comprehensive data on experimental indirect scalar NMR spin-spin coupling constants across hydrogen bonds. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2008; 46:599-624. [PMID: 18357569 DOI: 10.1002/mrc.2209] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Scalar NMR spin-spin coupling constants across hydrogen bonds are fundamental in structural studies and as test grounds for theoretical calculations. Since they are scattered among many articles of different kinds, it seems useful to collect them in the most comprehensive way.
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Affiliation(s)
- Ibon Alkorta
- Instituto de Química Médica (CSIC), Juan de la Cierva, 3, E-28006 Madrid, Spain.
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48
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Del Bene JE, Alkorta I, Elguero J. Ab Initio EOM-CCSD Spin−Spin Coupling Constants for Hydrogen-Bonded Formamide Complexes: Bridging Complexes with NH3, (NH3)2, H2O, (H2O)2, FH, and (FH)2. J Phys Chem A 2008; 112:6338-43. [DOI: 10.1021/jp801519v] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Janet E. Del Bene
- Department of Chemistry, Youngstown State University, Youngstown, Ohio 44555, and Instituto de Química Médica, CSIC, Juan de la Cierva 3, E-28006 Madrid, Spain
| | - Ibon Alkorta
- Department of Chemistry, Youngstown State University, Youngstown, Ohio 44555, and Instituto de Química Médica, CSIC, Juan de la Cierva 3, E-28006 Madrid, Spain
| | - José Elguero
- Department of Chemistry, Youngstown State University, Youngstown, Ohio 44555, and Instituto de Química Médica, CSIC, Juan de la Cierva 3, E-28006 Madrid, Spain
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49
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Estimation of internuclear couplings in the solid-state NMR of multiple-spin systems. Selective spin echoes and off-magic-angle sample spinning. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.03.021] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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50
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Griffin JM, Tripon C, Samoson A, Filip C, Brown SP. Low-load rotor-synchronised Hahn-echo pulse train (RS-HEPT) 1H decoupling in solid-state NMR: factors affecting MAS spin-echo dephasing times. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2007; 45 Suppl 1:S198-S208. [PMID: 18098353 DOI: 10.1002/mrc.2145] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Transverse dephasing times T(2)' in spin-echo MAS NMR using rotor-synchronised Hahn-echo pulse-train (RS-HEPT) low-load (1)H decoupling are evaluated. Experiments were performed at 300 and 600 MHz for (13)CH-labelled L-alanine and (15)NH(delta)-labelled L-histidine.HCl.H(2)O, together with SPINEVOLUTION simulations for a ten-spin system representing the crystal structure environment of the (13)CH carbon in L-alanine. For 30 kHz MAS and nu(1)((1)H) = 100 kHz at 300 MHz, a RS-HEPT T(2)' value of 17 +/- 1 ms was obtained for (13)CH-labelled L-alanine which is approximately 50% of the XiX T(2)' value of 33 +/- 2 ms. Optimum RS-HEPT decoupling performance is observed for a relative phase of alternate RS-HEPT pi-pulses, Deltaphi = phi'- phi, between 40 and 60 degrees . For experiments at 600 MHz and 30 kHz MAS with (13)CH-labelled L-alanine, the best RS-HEPT (nu(1)((1)H) = 100 kHz) T(2)' value was 3 times longer than that observed for low-power continuously applied sequences with nu(1)((1)H) < or =40 kHz, i.e. corresponding to the same average power dissipated in the probe. A marked improvement in RS-HEPT (1)H decoupling is observed for increasing MAS frequency: at 55.6 kHz MAS, a best RS-HEPT T(2)' value of 34 +/- 5 ms was recorded for (13)CH-labelled L-alanine. Much improved RS-HEPT broadband performance was also observed at 55.6 kHz MAS as compared to 30 kHz MAS.
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Affiliation(s)
- John M Griffin
- Department of Physics, University of Warwick, Coventry, UK
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