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Mathew R, Stevensson B, Edén M. Refined Structures of O-Phospho-l-serine and Its Calcium Salt by New Multinuclear Solid-State NMR Crystallography Methods. J Phys Chem B 2021; 125:10985-11004. [PMID: 34553936 PMCID: PMC8503883 DOI: 10.1021/acs.jpcb.1c05587] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Indexed: 12/17/2022]
Abstract
O-phospho-l-serine (Pser) and its Ca salt, Ca[O-phospho-l-serine]·H2O (CaPser), play important roles for bone mineralization and were recently also proposed to account for the markedly improved bone-adhesive properties of Pser-doped calcium phosphate-based cements for biomedical implants. However, the hitherto few proposed structural models of Pser and CaPser were obtained by X-ray diffraction, thereby leaving the proton positions poorly defined. Herein, we refine the Pser and CaPser structures by density functional theory (DFT) calculations and contrast them with direct interatomic-distance constraints from two-dimensional (2D) nuclear magnetic resonance (NMR) correlation experimentation at fast magic-angle spinning (MAS), encompassing double-quantum-single-quantum (2Q-1Q) 1H NMR along with heteronuclear 13C{1H} and 31P{1H} correlation NMR experiments. The Pser and CaPser structures before and after refinements by DFT were validated against sets of NMR-derived effective 1H-1H, 1H-31P, and 1H-13C distances, which confirmed the improved accuracy of the refined structures. Each distance set was derived from one sole 2D NMR experiment applied to a powder without isotopic enrichment. The distances were extracted without invoking numerical spin-dynamics simulations or approximate phenomenological models. We highlight the advantages and limitations of the new distance-extraction procedure. Isotropic 1H, 13C, and 31P chemical shifts obtained by DFT calculations using the gauge including projector augmented wave (GIPAW) method agreed very well with the experimental results. We discuss the isotropic and anisotropic 13C and 31P chemical-shift parameters in relation to the previous literature, where most data on CaPser are reported herein for the first time.
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Affiliation(s)
- Renny Mathew
- Department of Materials and Environmental
Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Baltzar Stevensson
- Department of Materials and Environmental
Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Mattias Edén
- Department of Materials and Environmental
Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
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2
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Melissen STAG, Le Bahers T, Sautet P, Steinmann SN. What does graphitic carbon nitride really look like? Phys Chem Chem Phys 2021; 23:2853-2859. [PMID: 33470995 DOI: 10.1039/d0cp06063a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Graphitic carbon nitrides (g-CNs) have become popular light absorbers in photocatalytic water splitting cells. Early theoretical work on these structures focused on fully polymerized g-C3N4. Experimentally, it is known that the typically employed melamine polycondensation does not go toward completion, yielding structures with ∼15 at% hydrogen. Here, we study the conformational stability of "melon", with the [C6N9H3]n structural formula using DFT. Referencing to a 2D melon sheet, B3LYP-dDsC and PBE-MBD computations revealed the same qualitative trend in stability of the 3D structures, with several of them within 5 kJ mol-1 per tecton. Fina's orthorhombic melon is the most stable of the studied conformers, with Lotsch' monoclinic melon taking an intermediate value. Invoking a simple Wannier-Mott-type approach, Fina's and Lotsch' structures exhibited the lowest optical gaps (2.8 eV), within the error margin of the experimental value (2.7 eV). All conformers yielded gaps below that of the monolayer's (3.2 eV), suggesting Jelley-type ("J") aggregation effects.
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Affiliation(s)
- Sigismund T A G Melissen
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Lyon, France
| | - Tangui Le Bahers
- Université de Lyon, Université Claude Bernard Lyon 1, Ecole Normale Supérieure de Lyon, CNRS, 46 allée d'Italie, F-69007 Lyon Cedex, France.
| | - Philippe Sautet
- Department of Chemical and Biomolecular engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA and Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Stephan N Steinmann
- Université de Lyon, Université Claude Bernard Lyon 1, Ecole Normale Supérieure de Lyon, CNRS, 46 allée d'Italie, F-69007 Lyon Cedex, France.
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3
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Hodgkinson P. NMR crystallography of molecular organics. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2020; 118-119:10-53. [PMID: 32883448 DOI: 10.1016/j.pnmrs.2020.03.001] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 02/25/2020] [Accepted: 03/13/2020] [Indexed: 06/11/2023]
Abstract
Developments of NMR methodology to characterise the structures of molecular organic structures are reviewed, concentrating on the previous decade of research in which density functional theory-based calculations of NMR parameters in periodic solids have become widespread. With a focus on demonstrating the new structural insights provided, it is shown how "NMR crystallography" has been used in a spectrum of applications from resolving ambiguities in diffraction-derived structures (such as hydrogen atom positioning) to deriving complete structures in the absence of diffraction data. As well as comprehensively reviewing applications, the different aspects of the experimental and computational techniques used in NMR crystallography are surveyed. NMR crystallography is seen to be a rapidly maturing subject area that is increasingly appreciated by the wider crystallographic community.
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Affiliation(s)
- Paul Hodgkinson
- Department of Chemistry, Durham University, Stockton Road, Durham DH1 3LE, UK.
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Kumar P, Vahidzadeh E, Thakur UK, Kar P, Alam KM, Goswami A, Mahdi N, Cui K, Bernard GM, Michaelis VK, Shankar K. C3N5: A Low Bandgap Semiconductor Containing an Azo-Linked Carbon Nitride Framework for Photocatalytic, Photovoltaic and Adsorbent Applications. J Am Chem Soc 2019; 141:5415-5436. [DOI: 10.1021/jacs.9b00144] [Citation(s) in RCA: 253] [Impact Index Per Article: 50.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Pawan Kumar
- Department of Electrical and Computer Engineering, University of Alberta, 9211 116 Street, Edmonton, Alberta T6G 1H9, Canada
| | - Ehsan Vahidzadeh
- Department of Electrical and Computer Engineering, University of Alberta, 9211 116 Street, Edmonton, Alberta T6G 1H9, Canada
| | - Ujwal K. Thakur
- Department of Electrical and Computer Engineering, University of Alberta, 9211 116 Street, Edmonton, Alberta T6G 1H9, Canada
| | - Piyush Kar
- Department of Electrical and Computer Engineering, University of Alberta, 9211 116 Street, Edmonton, Alberta T6G 1H9, Canada
| | - Kazi M. Alam
- Department of Electrical and Computer Engineering, University of Alberta, 9211 116 Street, Edmonton, Alberta T6G 1H9, Canada
| | - Ankur Goswami
- Department of Electrical and Computer Engineering, University of Alberta, 9211 116 Street, Edmonton, Alberta T6G 1H9, Canada
| | - Najia Mahdi
- Department of Electrical and Computer Engineering, University of Alberta, 9211 116 Street, Edmonton, Alberta T6G 1H9, Canada
| | - Kai Cui
- Nanotechnology
Research Centre, National Research Council of Canada, Edmonton, Alberta T6G 2M9, Canada
| | - Guy M. Bernard
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | | | - Karthik Shankar
- Department of Electrical and Computer Engineering, University of Alberta, 9211 116 Street, Edmonton, Alberta T6G 1H9, Canada
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Grüninger H, Schmutzler A, Siegel R, Armstrong K, Frost DJ, Senker J. Quantitative description of 1H SQ and DQ coherences for the hydroxyl disorder within hydrous ringwoodite. Phys Chem Chem Phys 2018; 20:15098-15105. [PMID: 29799049 DOI: 10.1039/c8cp00863a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Proton-containing point defects in solid materials are important for a variety of properties ranging from ionic transport over thermal conductivity up to compressibility. Ultrafast magic-angle spinning techniques nowadays offer high-resolution solid-state NMR spectra, even for 1H, and thus open up possibilities to study the underlying defect chemistry. Nevertheless, disorder within such defects again leads to heavy spectral overlap of 1H resonances, which prevents quantitative analysis of defect concentrations, if several defect types are present. Here, we present a strategy to overcome this limitation by simulating the 1H lineshape as well as 1H-1H double-quantum buildup curves, which we then validate against the experimental data in a joint cost function. To mimic the local structural disorder, we use molecular dynamics simulations at the DFT level. It turned out to be advantageous for the joint refinement to put the computational effort into the structural optimisation to derive accurate proton positions and to use empirical correlations for the relation between isotropic and anisotropic 1H chemical shifts and structural elements. The expressiveness of this approach is demonstrated on ringwoodite's (γ-Mg2SiO4) OH defect chemistry containing four different defect types in octahedral and tetrahedral voids with both pure Mg and mixed Si and Mg cation environments. Still, we determine the ratio for each defect type with an accuracy of about 5% as a result of the minimization of the joint cost function. We expect that our approach is generally applicable for local proton disorder and might prove to be a valuable alternative to the established AIRSS and Monte Carlo methods, respectively.
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Affiliation(s)
- Helen Grüninger
- Anorganische Chemie III, University of Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany.
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Selective photocatalytic oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxaldehyde by polymeric carbon nitride-hydrogen peroxide adduct. J Catal 2018. [DOI: 10.1016/j.jcat.2018.01.012] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Tschense CBL, Reimer N, Hsu CW, Reinsch H, Siegel R, Chen WJ, Lin CH, Cadiau A, Serre C, Senker J, Stock N. New Group 13 MIL-53 Derivates based on 2,5-Thiophenedicarboxylic Acid. Z Anorg Allg Chem 2017. [DOI: 10.1002/zaac.201700260] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Carsten B. L. Tschense
- Department for Inorganic Chemistry III; University of Bayreuth; Universitätsstraße 30 95440 Bayreuth Germany
| | - Nele Reimer
- Institut für Anorganische Chemie; Christian-Albrechts-Universität zu Kiel; Max-Eyth-Straße 2 24118 Kiel Germany
| | - Ching-Wen Hsu
- Department of Chemistry; Professor Chung Yuan Christian University; 320 Chung-Li Taoyuan Taiwan
| | - Helge Reinsch
- Institut für Anorganische Chemie; Christian-Albrechts-Universität zu Kiel; Max-Eyth-Straße 2 24118 Kiel Germany
| | - Renée Siegel
- Department for Inorganic Chemistry III; University of Bayreuth; Universitätsstraße 30 95440 Bayreuth Germany
| | - Wen-Jin Chen
- Green Energy & Environment Research Laboratories; Industrial Technology Research Institute; 310 Hsinchu Taiwan
| | - Chia-Her Lin
- Department of Chemistry; Professor Chung Yuan Christian University; 320 Chung-Li Taoyuan Taiwan
| | - Amadine Cadiau
- Institut Lavoisier de Versailles, UMR CNRS 8180; Université de Versailles St Quentin; 78035 Versailles France
| | - Christian Serre
- Institut Lavoisier de Versailles, UMR CNRS 8180; Université de Versailles St Quentin; 78035 Versailles France
- Institut des Matériaux Poreux de Paris, FRE 2000 CNRS; Ecole Normale Supérieure; Ecole Supérieure de Physique et de Chimie Industrielles de Paris, PSL Research University; 75005 Paris France
| | - Jürgen Senker
- Department for Inorganic Chemistry III; University of Bayreuth; Universitätsstraße 30 95440 Bayreuth Germany
| | - Norbert Stock
- Institut für Anorganische Chemie; Christian-Albrechts-Universität zu Kiel; Max-Eyth-Straße 2 24118 Kiel Germany
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8
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Mesch MB, Bärwinkel K, Krysiak Y, Martineau C, Taulelle F, Neder RB, Kolb U, Senker J. Solving the Hydrogen and Lithium Substructure of Poly(triazine imide)/LiCl Using NMR Crystallography. Chemistry 2016; 22:16878-16890. [DOI: 10.1002/chem.201603726] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Maria B. Mesch
- Inorganic Chemistry III; University of Bayreuth; 95447 Bayreuth Germany
| | - Kilian Bärwinkel
- Inorganic Chemistry III; University of Bayreuth; 95447 Bayreuth Germany
| | - Yaşar Krysiak
- Institute of Inorganic Chemistry and Analytical Chemistry; Johannes Gutenberg University Mainz; Jakob-Welder-Weg 11 55128 Mainz Germany
| | - Charlotte Martineau
- Tectospin; Institut Lavoisier de Versailles (ILV), UMR CNRS 8180; Université de Versailles Saint-Quentin-en-Yvelines; 45 Avenue des Etats-Unis 78035 Versailles cedex France
| | - Francis Taulelle
- Tectospin; Institut Lavoisier de Versailles (ILV), UMR CNRS 8180; Université de Versailles Saint-Quentin-en-Yvelines; 45 Avenue des Etats-Unis 78035 Versailles cedex France
| | - Reinhard B. Neder
- Lehrstuhl für Kristallographie und Strukturphysik; Friedrich-Alexander-Universität Erlangen-Nürnberg; Staudtstr. 3 91058 Erlangen Germany
| | - Ute Kolb
- Institute of Inorganic Chemistry and Analytical Chemistry; Johannes Gutenberg University Mainz; Jakob-Welder-Weg 11 55128 Mainz Germany
| | - Jürgen Senker
- Inorganic Chemistry III; University of Bayreuth; 95447 Bayreuth Germany
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Aguiar DLMD, San Gil RADS, Alencastro RBD, Souza EFD, Borré LB, Vaiss VDS, Leitão AA. 6-Aminopenicillanic acid revisited: A combined solid state NMR and in silico refinement. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.08.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Zehe CS, Siegel R, Senker J. Influence of proton coupling on symmetry-based homonuclear (19)F dipolar recoupling experiments. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 65:122-131. [PMID: 25572924 DOI: 10.1016/j.ssnmr.2014.12.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Revised: 12/03/2014] [Accepted: 12/05/2014] [Indexed: 06/04/2023]
Abstract
We study the efficiency of two symmetry based homonuclear (19)F double-quantum recoupling sequences for moderate (R142(6)) and ultra-fast (R144(5)) MAS under the influence of strong (1)H-(1)H and (1)H-(19)F dipolar interactions and (1)H continuous wave decoupling. Simulations based on various spin systems derived from the organic solid 1,3,5-tris(2-fluoro-2-methylpropionylamino)benzene (F-BTA), used as a model system, reveal that the strong-decoupling limit is not accessible even for moderate spinning speeds. Additionally, for the no-decoupling limit improved DQ efficiencies are predicted for both moderate and ultra-fast MAS. Strong perturbations of build-up curves can be avoided by additional stabilisation through supercycling. Additional (1)H cw decoupling during (19)F recoupling rapidly reduces the maximum DQ efficiency when deviating from the no-decoupling limit. These effects were confirmed by experimental data on F-BTA. For moderate spinning the influence of (1)H-(1)H and (1)H-(19)F couplings is markedly stronger compared to ultra-fast MAS. For the latter case those influences reduce to a constant scaling if only short excitation times up to the first minimum are taken into account. Based on this analysis the experimental build-up curves of 1,3,5-tris(2-fluoro-2-methylpropionylamino)benzene can be refined with homonuclear (19)F spin systems which allow to probe even subtle structural differences for the fluorine atoms of F-BTA.
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Affiliation(s)
- Christoph S Zehe
- Inorganic Chemistry III, University of Bayreuth, 95447 Bayreuth, Germany
| | - Renée Siegel
- Inorganic Chemistry III, University of Bayreuth, 95447 Bayreuth, Germany
| | - Jürgen Senker
- Inorganic Chemistry III, University of Bayreuth, 95447 Bayreuth, Germany.
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11
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Zehe C, Schmidt M, Siegel R, Kreger K, Daebel V, Ganzleben S, Schmidt HW, Senker J. Influence of fluorine side-group substitution on the crystal structure formation of benzene-1,3,5-trisamides. CrystEngComm 2014. [DOI: 10.1039/c4ce01077a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The crystal structure of 1,3,5-tris(2-fluoro-2-methylpropionylamino)benzene was solved by combining powder X-ray diffraction, solid-state NMR spectroscopy and quantum chemical calculations.
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Affiliation(s)
- Christoph Zehe
- Inorganic Chemistry III and Bayreuth Center for Colloids and Interfaces
- University of Bayreuth
- Bayreuth, Germany
| | - Marko Schmidt
- Inorganic Chemistry III and Bayreuth Center for Colloids and Interfaces
- University of Bayreuth
- Bayreuth, Germany
| | - Renée Siegel
- Inorganic Chemistry III and Bayreuth Center for Colloids and Interfaces
- University of Bayreuth
- Bayreuth, Germany
| | - Klaus Kreger
- Macromolecular Chemistry I
- Bayreuth Institute of Macromolecular Research and Bayreuth Center for Colloids and Interfaces
- University of Bayreuth
- Bayreuth, Germany
| | | | - Sandra Ganzleben
- Macromolecular Chemistry I
- Bayreuth Institute of Macromolecular Research and Bayreuth Center for Colloids and Interfaces
- University of Bayreuth
- Bayreuth, Germany
| | - Hans-Werner Schmidt
- Macromolecular Chemistry I
- Bayreuth Institute of Macromolecular Research and Bayreuth Center for Colloids and Interfaces
- University of Bayreuth
- Bayreuth, Germany
| | - Jürgen Senker
- Inorganic Chemistry III and Bayreuth Center for Colloids and Interfaces
- University of Bayreuth
- Bayreuth, Germany
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12
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Schmidt M, Zehe CS, Siegel R, Heigl JU, Steinlein C, Schmidt HW, Senker J. NMR-crystallographic study of two-dimensionally self-assembled cyclohexane-based low-molecular-mass organic compounds. CrystEngComm 2013. [DOI: 10.1039/c3ce41158c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Bonhomme C, Gervais C, Babonneau F, Coelho C, Pourpoint F, Azaïs T, Ashbrook SE, Griffin JM, Yates JR, Mauri F, Pickard CJ. First-principles calculation of NMR parameters using the gauge including projector augmented wave method: a chemist's point of view. Chem Rev 2012; 112:5733-79. [PMID: 23113537 DOI: 10.1021/cr300108a] [Citation(s) in RCA: 318] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Christian Bonhomme
- Laboratoire de Chimie de la Matière Condensée de Paris, Université Pierre et Marie Curie, CNRS UMR, Collège de France, France.
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Yazawa K, Suzuki F, Nishiyama Y, Ohata T, Aoki A, Nishimura K, Kaji H, Shimizu T, Asakura T. Determination of accurate 1H positions of an alanine tripeptide with anti-parallel and parallel β-sheet structures by high resolution 1H solid state NMR and GIPAW chemical shift calculation. Chem Commun (Camb) 2012; 48:11199-201. [PMID: 23044520 DOI: 10.1039/c2cc36300c] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The accurate (1)H positions of alanine tripeptide, A(3), with anti-parallel and parallel β-sheet structures could be determined by highly resolved (1)H DQMAS solid-state NMR spectra and (1)H chemical shift calculation with gauge-including projector augmented wave calculations.
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Affiliation(s)
- Koji Yazawa
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Koganei, Tokyo, Japan
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Brown SP. Applications of high-resolution 1H solid-state NMR. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2012; 41:1-27. [PMID: 22177472 DOI: 10.1016/j.ssnmr.2011.11.006] [Citation(s) in RCA: 184] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2011] [Revised: 11/15/2011] [Accepted: 11/16/2011] [Indexed: 05/25/2023]
Abstract
This article reviews the large increase in applications of high-resolution (1)H magic-angle spinning (MAS) solid-state NMR, in particular two-dimensional heteronuclear and homonuclear (double-quantum and spin-diffusion NOESY-like exchange) experiments, in the last five years. These applications benefit from faster MAS frequencies (up to 80 kHz), higher magnetic fields (up to 1 GHz) and pulse sequence developments (e.g., homonuclear decoupling sequences applicable under moderate and fast MAS). (1)H solid-state NMR techniques are shown to provide unique structural insight for a diverse range of systems including pharmaceuticals, self-assembled supramolecular structures and silica-based inorganic-organic materials, such as microporous and mesoporous materials and heterogeneous organometallic catalysts, for which single-crystal diffraction structures cannot be obtained. The power of NMR crystallography approaches that combine experiment with first-principles calculations of NMR parameters (notably using the GIPAW approach) are demonstrated, e.g., to yield quantitative insight into hydrogen-bonding and aromatic CH-π interactions, as well as to generate trial three-dimensional packing arrangements. It is shown how temperature-dependent changes in the (1)H chemical shift, linewidth and DQ-filtered signal intensity can be analysed to determine the thermodynamics and kinetics of molecular level processes, such as the making and breaking of hydrogen bonds, with particular application to proton-conducting materials. Other applications to polymers and biopolymers, inorganic compounds and bioinorganic systems, paramagnetic compounds and proteins are presented. The potential of new technological advances such as DNP methods and new microcoil designs is described.
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Affiliation(s)
- Steven P Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom.
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16
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Martineau C, Cadiau A, Bouchevreau B, Senker J, Taulelle F, Adil K. SMARTER crystallography of the fluorinated inorganic–organic compound Zn3Al2F12·[HAmTAZ]6. Dalton Trans 2012; 41:6232-41. [DOI: 10.1039/c2dt30100h] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Widdifield CM, Bryce DL. A multinuclear solid-state magnetic resonance and GIPAW DFT study of anhydrous calcium chloride and its hydrates. CAN J CHEM 2011. [DOI: 10.1139/v11-009] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The group 2 metal halides and corresponding metal halide hydrates serve as useful model systems for understanding the relationship between the electric field gradient (EFG) and chemical shift (CS) tensors at the halogen nuclei and the local molecular and electronic structure. Here, we present a 35/37Cl and 43Ca solid-state nuclear magnetic resonance (SSNMR) study of CaCl2. The 35Cl nuclear quadrupole coupling constant, 8.82(8) MHz, and the isotropic chlorine CS, 105(8) ppm (with respect to dilute NaCl(aq)), are different from the values reported previously for this compound, as well as those reported for CaCl2·2H2O. Chlorine-35 SSNMR spectra are also presented for CaCl2·6H2O, and when taken in concert, the SSNMR observations for CaCl2, CaCl2·2H2O, and CaCl2·6H2O clearly demonstrate the sensitivity of the chlorine EFG and CS tensors to the local symmetry and to changes in the hydration state. For example, the value of δiso decreases with increasing hydration. Gauge-including projector-augmented wave (GIPAW) density functional theory (DFT) calculations are used to substantiate the experimental SSNMR findings, to rule out the presence of other hydrates in our samples, to refine the hydrogen positions in CaCl2·2H2O, and to explore the isostructural relationship between CaCl2 and CaBr2. Finally, the 43Ca CS tensor span is measured to be 31(5) ppm for anhydrous CaCl2, which represents only the fifth CS tensor span measurement for calcium.
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Affiliation(s)
- Cory M. Widdifield
- Department of Chemistry and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie Private, Ottawa, ON K1N 6N5, Canada
| | - David L. Bryce
- Department of Chemistry and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie Private, Ottawa, ON K1N 6N5, Canada
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Khan M, Enkelmann V, Brunklaus G. Heterosynthon mediated tailored synthesis of pharmaceutical complexes: a solid-state NMR approach. CrystEngComm 2011. [DOI: 10.1039/c0ce00657b] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Gorelik T, Matveeva G, Kolb U, Schleuß T, Kilbinger AFM, van de Streek J, Bohle A, Brunklaus G. H-bonding schemes of di- and tri-p-benzamides assessed by a combination of electron diffraction, X-ray powder diffraction and solid-state NMR. CrystEngComm 2010. [DOI: 10.1039/b920569a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Seyfarth L, Seyfarth J, Lotsch BV, Schnick W, Senker J. Tackling the stacking disorder of melon—structure elucidation in a semicrystalline material. Phys Chem Chem Phys 2010; 12:2227-37. [DOI: 10.1039/b919918g] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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