1
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Rehman Z, Franks WT, Nguyen B, Schmidt HF, Scrivens G, Brown SP. Discovering the Solid-State Secrets of Lorlatinib by NMR Crystallography: To Hydrogen Bond or not to Hydrogen Bond. J Pharm Sci 2023; 112:1915-1928. [PMID: 36868358 DOI: 10.1016/j.xphs.2023.02.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 02/22/2023] [Accepted: 02/22/2023] [Indexed: 03/05/2023]
Abstract
Lorlatinib is an active pharmaceutical ingredient (API) used in the treatment of lung cancer. Here, an NMR crystallography analysis is presented whereby the single-crystal X-ray diffraction structure (CSD: 2205098) determination is complemented by multinuclear (1H, 13C, 14/15N, 19F) magic-angle spinning (MAS) solid-state NMR and gauge-including projector augmented wave (GIPAW) calculation of NMR chemical shifts. Lorlatinib crystallises in the P21 space group, with two distinct molecules in the asymmetric unit cell, Z' = 2. Three of the four NH2 hydrogen atoms form intermolecular hydrogen bonds, N30-H…N15 between the two distinct molecules and N30-H…O2 between two equivalent molecules. This is reflected in one of the NH21H chemical shifts being significantly lower, 4.0 ppm compared to 7.0 ppm. Two-dimensional 1H-13C, 14N-1H and 1H (double-quantum, DQ)-1H (single-quantum, SQ) MAS NMR spectra are presented. The 1H resonances are assigned and specific HH proximities corresponding to the observed DQ peaks are identified. The resolution enhancement at a 1H Larmor frequency of 1 GHz as compared to 500 or 600 MHz is demonstrated.
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Affiliation(s)
- Zainab Rehman
- Department of Physics, University of Warwick, Coventry, CV4 7AL, UK
| | - W Trent Franks
- Department of Physics, University of Warwick, Coventry, CV4 7AL, UK
| | | | | | | | - Steven P Brown
- Department of Physics, University of Warwick, Coventry, CV4 7AL, UK.
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2
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Brouwer DH, Mikolajewski JG. A combined solid-state NMR and quantum chemical calculation study of hydrogen bonding in two forms of α-d-glucose. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2023; 123:101848. [PMID: 36584544 DOI: 10.1016/j.ssnmr.2022.101848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 12/07/2022] [Accepted: 12/13/2022] [Indexed: 06/17/2023]
Abstract
Hydrogen bonding plays an important role in the structure and function of a wide range of materials. Solid-state 1H nuclear magnetic resonance (NMR) spectroscopy provides a very sensitive tool to investigate the local structure of hydrogen atoms involved in hydrogen bonding. While there is extensive 1H solid-state NMR data on O-H - - O hydrogen bonding in solid carboxylic acids, there has been no systematic 1H solid-state NMR studies of hydroxyl groups in carbohydrates (and hydroxyl groups in general). With a view to studying the hydrogen bonding in more complex materials such as cellulose polymorphs, we carried out a detailed solid-state 1H NMR investigation of the model compounds α-d-glucose and α-d-glucose monohydrate. Through a combination of fast magic-angle spinning (MAS), combined rotation and multiple pulse spectroscopy (CRAMPS), and two-dimensional (2D) correlation experiments carried out at ultrahigh magnetic fields, it was possible to assign all of the aliphatic (CH), hydroxyl (OH), and water (H2O) 1H chemical shifts in both forms of α-d-glucose. Plane-wave DFT calculations were employed to improve the hydrogen atom positions for α-d-glucose monohydrate and to calculate 1H chemical shifts, providing additional support for the experimentally determined peak assignments. Finally, the relationship between the hydroxyl 1H chemical shifts and their hydrogen bonding geometry was investigated and compared to the well-established relationship for carboxylic acid protons.
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Affiliation(s)
- Darren H Brouwer
- Department of Chemistry, Redeemer University, Ancaster, ON, L9K 1J4, Canada.
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3
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Du Y, Frank D, Chen Z, Struppe J, Su Y. Ultrafast magic angle spinning NMR characterization of pharmaceutical solid polymorphism: A posaconazole example. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2023; 346:107352. [PMID: 36535214 DOI: 10.1016/j.jmr.2022.107352] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Revised: 11/30/2022] [Accepted: 12/02/2022] [Indexed: 06/17/2023]
Abstract
Protons represent the most NMR-sensitive nucleus in pharmaceutical compounds. Therefore, proton-detected solid-state NMR techniques under fast magic angle spinning are among the few solutions to overcome the challenge of low sensitivity to analyze natural abundant drug substances and products. In this study, we report the structural characterization of crystal polymorphs of a commercial drug molecule, posaconazole, with a relatively large molecular weight of 700.8 g·mol-1 and at the natural abundance. The enhanced sensitivity and resolution at 100 kHz MAS enables the exploration of the distinct intermolecular packing in posaconazole forms I, III, and γ. These results demonstrate that proton-detected homo- and heteronuclear correlation methods can probe the structural details of pharmaceutical polymorphism.
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Affiliation(s)
- Yong Du
- Analytical Research & Development, Merck & Co., Inc, Rahway, NJ 07065, USA
| | - Derek Frank
- Process Research & Development, Merck & Co., Inc, Rahway, NJ 07065, USA
| | - Zhenxuan Chen
- Analytical Research & Development, Merck & Co., Inc, Rahway, NJ 07065, USA
| | | | - Yongchao Su
- Analytical Research & Development, Merck & Co., Inc, Rahway, NJ 07065, USA.
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4
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Štoček JR, Socha O, Císařová I, Slanina T, Dračínský M. Importance of Nuclear Quantum Effects for Molecular Cocrystals with Short Hydrogen Bonds. J Am Chem Soc 2022; 144:7111-7116. [PMID: 35394771 DOI: 10.1021/jacs.1c10885] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Many efforts have been recently devoted to the design and investigation of multicomponent pharmaceutical solids, such as salts and cocrystals. The experimental distinction between these solid forms is often challenging. Here, we show that the transformation of a salt into a cocrystal with a short hydrogen bond does not occur as a sharp phase transition but rather a smooth shift of the positional probability of the hydrogen atoms. A combination of solid-state NMR spectroscopy, X-ray diffraction, and diffuse reflectance measurements with density functional theory calculations that include nuclear quantum effects (NQEs) provides evidence of temperature-induced hydrogen atom shift in cocrystals with short hydrogen bonds. We demonstrate that for the predictions of the salt/cocrystal solid forms with short H-bonds, the computations have to include NQEs (particularly hydrogen nuclei delocalization) and temperature effects.
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Affiliation(s)
- Jakub Radek Štoček
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 2, Prague 6 160 00, Czech Republic.,Department of Organic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, Prague 2 12840, Czech Republic
| | - Ondřej Socha
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 2, Prague 6 160 00, Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, Prague 2 12840, Czech Republic
| | - Tomáš Slanina
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 2, Prague 6 160 00, Czech Republic
| | - Martin Dračínský
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 2, Prague 6 160 00, Czech Republic
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5
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Malär A, Völker LA, Cadalbert R, Lecoq L, Ernst M, Böckmann A, Meier BH, Wiegand T. Temperature-Dependent Solid-State NMR Proton Chemical-Shift Values and Hydrogen Bonding. J Phys Chem B 2021; 125:6222-6230. [PMID: 34097409 PMCID: PMC8215646 DOI: 10.1021/acs.jpcb.1c04061] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 05/20/2021] [Indexed: 01/17/2023]
Abstract
Temperature-dependent NMR experiments are often complicated by rather long magnetic-field equilibration times, for example, occurring upon a change of sample temperature. We demonstrate that the fast temporal stabilization of a magnetic field can be achieved by actively stabilizing the temperature of the magnet bore, which allows quantification of the weak temperature dependence of a proton chemical shift, which can be diagnostic for the presence of hydrogen bonds. Hydrogen bonding plays a central role in molecular recognition events from both fields, chemistry and biology. Their direct detection by standard structure-determination techniques, such as X-ray crystallography or cryo-electron microscopy, remains challenging due to the difficulties of approaching the required resolution, on the order of 1 Å. We, herein, explore a spectroscopic approach using solid-state NMR to identify protons engaged in hydrogen bonds and explore the measurement of proton chemical-shift temperature coefficients. Using the examples of a phosphorylated amino acid and the protein ubiquitin, we show that fast magic-angle spinning (MAS) experiments at 100 kHz yield sufficient resolution in proton-detected spectra to quantify the rather small chemical-shift changes upon temperature variations.
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Affiliation(s)
| | | | | | - Lauriane Lecoq
- Molecular
Microbiology and Structural Biochemistry, Labex Ecofect, UMR 5086 CNRS/Université de Lyon, 69367 Lyon, France
| | - Matthias Ernst
- Physical
Chemistry, ETH Zurich, 8093 Zurich, Switzerland
| | - Anja Böckmann
- Molecular
Microbiology and Structural Biochemistry, Labex Ecofect, UMR 5086 CNRS/Université de Lyon, 69367 Lyon, France
| | - Beat H. Meier
- Physical
Chemistry, ETH Zurich, 8093 Zurich, Switzerland
| | - Thomas Wiegand
- Physical
Chemistry, ETH Zurich, 8093 Zurich, Switzerland
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6
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Structure of Silk I ( Bombyx mori Silk Fibroin before Spinning) -Type II β-Turn, Not α-Helix. Molecules 2021; 26:molecules26123706. [PMID: 34204550 PMCID: PMC8234240 DOI: 10.3390/molecules26123706] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 06/11/2021] [Accepted: 06/14/2021] [Indexed: 12/04/2022] Open
Abstract
Recently, considerable attention has been paid to Bombyx mori silk fibroin by a range of scientists from polymer chemists to biomaterial researchers because it has excellent physical properties, such as strength, toughness, and biocompatibility. These appealing physical properties originate from the silk fibroin structure, and therefore, structural determinations of silk fibroin before (silk I) and after (silk II) spinning are a key to make wider applications of silk. There are discrepancies about the silk I structural model, i.e., one is type II β-turn structure determined using many solid-state and solution NMR spectroscopies together with selectively stable isotope-labeled model peptides, but another is α-helix or partially α-helix structure speculated using IR and Raman methods. In this review, firstly, the process that led to type II β-turn structure by the authors was introduced in detail. Then the problems in speculating silk I structure by IR and Raman methods were pointed out together with the problem in the assignment of the amide I band in the spectra. It has been emphasized that the conformational analyses of proteins and peptides from IR and Raman studies are not straightforward and should be very careful when the proteins contain β-turn structure using many experimental data by Vass et al. In conclusion, the author emphasized here that silk I structure should be type II β-turn, not α-helix.
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7
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Mathew R, Uchman KA, Gkoura L, Pickard CJ, Baias M. Identifying aspirin polymorphs from combined DFT-based crystal structure prediction and solid-state NMR. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2020; 58:1018-1025. [PMID: 31900955 DOI: 10.1002/mrc.4987] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 12/17/2019] [Accepted: 01/02/2020] [Indexed: 06/10/2023]
Abstract
A combined experimental and computational approach was used to distinguish between different polymorphs of the pharmaceutical drug aspirin. This method involves the use of ab initio random structure searching (AIRSS), a density functional theory (DFT)-based crystal structure prediction method for the high-accuracy prediction of polymorphic structures, with DFT calculations of nuclear magnetic resonance (NMR) parameters and solid-state NMR experiments at natural abundance. AIRSS was used to predict the crystal structures of form-I and form-II of aspirin. The root-mean-square deviation between experimental and calculated 1 H chemical shifts was used to identify form-I as the polymorph present in the experimental sample, the selection being successful despite the large similarities between the molecular environments in the crystals of the two polymorphs.
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Affiliation(s)
- Renny Mathew
- Division of Science, New York University Abu Dhabi, Abu Dhabi, UAE
| | | | - Lydia Gkoura
- Division of Science, New York University Abu Dhabi, Abu Dhabi, UAE
| | - Chris J Pickard
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK
- Advanced Institute for Materials Research, Tohoku University, Sendai, Japan
| | - Maria Baias
- Division of Science, New York University Abu Dhabi, Abu Dhabi, UAE
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8
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Xu J, Terskikh VV, Chu Y, Zheng A, Huang Y. 13 C chemical shift tensors in MOF α-Mg 3 (HCOO) 6 : Which component is more sensitive to host-guest interaction? MAGNETIC RESONANCE IN CHEMISTRY : MRC 2020; 58:1082-1090. [PMID: 31659777 DOI: 10.1002/mrc.4944] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 08/23/2019] [Accepted: 09/16/2019] [Indexed: 06/10/2023]
Abstract
Metal-organic frameworks (MOFs) are a class of important porous materials with many current and potential applications. Their applications almost always involve the interaction between host framework and guest species. Therefore, understanding of host-guest interaction in MOF systems is fundamentally important. Solid-state NMR spectroscopy is an excellent technique for investigating host-guest interaction as it provides information complementary to that obtained from X-ray diffraction. In this work, using MOF α-Mg3 (HCOO)6 as an example, we demonstrated that 13 C chemical shift tensor of organic linker can be utilized to probe the host-guest interaction in MOFs. Obtaining 13 C chemical shift tensor components (δ11 , δ22 , and δ33 , where δ11 ≥ δ22 ≥ δ33 ) in this MOF is particularly challenging as there are six coordinatively equivalent but crystallographically non-equivalent carbons in the unit cell with very similar local coordination environment. Two-dimensional magic-angle-turning experiments were employed to measure the 13 C chemical shift tensors of each individual crystallographically non-equivalent carbon in three microporous α-Mg3 (HCOO)6 samples with different guest species. The results indicate that the δ22 component (with its direction approximately being co-planar with the formate anion and perpendicular to the C-H bond) is more sensitive to the adsorbate molecules inside the MOF channel due to the weak C-H···O hydrogen bonding or the ring current effect of benzene. The 13 C isotropic chemical shift, on the other hand, seems much less sensitive to the subtle changes in the local environment around formate linker induced by adsorption. The approach described in this study may be used in future studies on host-guest interaction within MOFs.
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Affiliation(s)
- Jun Xu
- Center for Rare Earth and Inorganic Functional Materials, Tianjin Key Lab for Rare Earth Materials and Applications, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin, 300350, P.R. China
- Department of Chemistry, The University of Western Ontario, London, Ontario, N6A 5B7, Canada
| | - Victor V Terskikh
- Department of Chemistry, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Yueying Chu
- Chinese Academy of Sciences, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Wuhan, 430071, P.R. China
| | - Anmin Zheng
- Chinese Academy of Sciences, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Wuhan, 430071, P.R. China
| | - Yining Huang
- Department of Chemistry, The University of Western Ontario, London, Ontario, N6A 5B7, Canada
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9
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Corlett EK, Blade H, Hughes LP, Sidebottom PJ, Walker D, Walton RI, Brown SP. Investigating discrepancies between experimental solid-state NMR and GIPAW calculation: NC-N 13C and OH⋯O 1H chemical shifts in pyridinium fumarates and their cocrystals. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2020; 108:101662. [PMID: 32590237 DOI: 10.1016/j.ssnmr.2020.101662] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 03/25/2020] [Accepted: 03/25/2020] [Indexed: 06/11/2023]
Abstract
An NMR crystallography analysis is presented for four solid-state structures of pyridine fumarates and their cocrystals, using crystal structures deposited in the Cambridge Crystallographic Data Centre, CCDC. Experimental one-dimensional one-pulse 1H and 13C cross-polarisation (CP) magic-angle spinning (MAS) nuclear magnetic resonance (NMR) and two-dimensional 14N-1H heteronuclear multiple-quantum coherence MAS NMR spectra are compared with gauge-including projector augmented wave (GIPAW) calculations of the 1H and 13C chemical shifts and the 14N shifts that additionally depend on the quadrupolar interaction. Considering the high ppm (>10 ppm) 1H resonances, while there is good agreement (within 0.4 ppm) between experiment and GIPAW calculation for the hydrogen-bonded NH moieties, the hydrogen-bonded fumaric acid OH resonances are 1.2-1.9 ppm higher in GIPAW calculation as compared to experiment. For the cocrystals of a salt and a salt formed by 2-amino-5-methylpyridinium and 2-amino-6-methylpyridinium ions, a large discrepancy of 4.2 and 5.9 ppm between experiment and GIPAW calculation is observed for the quaternary ring carbon 13C resonance that is directly bonded to two nitrogens (in the ring and in the amino group). By comparison, there is excellent agreement (within 0.2 ppm) for the quaternary ring carbon 13C resonance directly bonded to the ring nitrogen for the salt and cocrystal of a salt formed by 2,6-lutidinium and 2,5-lutidinium, respectively.
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Affiliation(s)
- Emily K Corlett
- Department of Physics, University of Warwick, Coventry, CV4 7AL, UK
| | - Helen Blade
- Pharmaceutical Development, AstraZeneca, Macclesfield, SK10 2NA, UK
| | - Leslie P Hughes
- Pharmaceutical Development, AstraZeneca, Macclesfield, SK10 2NA, UK
| | - Philip J Sidebottom
- Syngenta, Jealott's Hill International Research Centre, Bracknell, Berkshire, RG42 6EY, UK
| | - David Walker
- Department of Physics, University of Warwick, Coventry, CV4 7AL, UK
| | - Richard I Walton
- Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK
| | - Steven P Brown
- Department of Physics, University of Warwick, Coventry, CV4 7AL, UK.
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10
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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: 65] [Impact Index Per Article: 16.3] [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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11
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Xiao YY, Liu XL, Chang GG, Pu C, Tian G, Wang LY, Liu JW, Ma XC, Yang XY, Chen B. Construction of a functionalized hierarchical pore metal-organic framework via a palladium-reduction induced strategy. NANOSCALE 2020; 12:6250-6255. [PMID: 32150185 DOI: 10.1039/c9nr10092j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Hierarchical porosity and functionalization are recognized as two crucial parameters in mediating the catalytic performance of heterogeneous catalysts, however, they are rarely achieved simultaneously in the development of metal-organic frameworks (MOFs). In this work, a simple and efficient method has been developed to synchronously construct hierarchical porosity and functionalization within a sulfonic acid group functionalized microporous MOF via a palladium-reduction induced strategy, for the first time. The generation mechanism of the mesopore has been explained using two-dimensional 1H DQ-SQ MAS NMR. The content of the mesopore and the active sites within mesoPd@NUS-6 could be finely tuned by simply controlling Pd loading. Particularly, the combination of hierarchical porosity and functionalization, as well as the ultra-stable structure endow the composites with great potential in bulk, for adsorption and heterogeneous catalysis.
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Affiliation(s)
- Yue-Yang Xiao
- School of Chemistry, Chemical Engineering and Life Science, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, Hubei 430070, China.
| | | | - Gang-Gang Chang
- School of Chemistry, Chemical Engineering and Life Science, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, Hubei 430070, China.
| | - Chun Pu
- School of Chemistry, Chemical Engineering and Life Science, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, Hubei 430070, China.
| | - Ge Tian
- School of Chemistry, Chemical Engineering and Life Science, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, Hubei 430070, China.
| | - Li-Ying Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan, Hubei 430071, China
| | - Jia-Wen Liu
- School of Chemistry, Chemical Engineering and Life Science, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, Hubei 430070, China.
| | - Xiao-Chen Ma
- School of Chemistry, Chemical Engineering and Life Science, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, Hubei 430070, China.
| | - Xiao-Yu Yang
- School of Chemistry, Chemical Engineering and Life Science, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, Hubei 430070, China.
| | - Banglin Chen
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, USA.
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12
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Mann SK, Pham TN, McQueen LL, Lewandowski JR, Brown SP. Revealing Intermolecular Hydrogen Bonding Structure and Dynamics in a Deep Eutectic Pharmaceutical by Magic-Angle Spinning NMR Spectroscopy. Mol Pharm 2020; 17:622-631. [PMID: 31887061 PMCID: PMC7007282 DOI: 10.1021/acs.molpharmaceut.9b01075] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Liquid forms of pharmaceuticals (ionic liquids and deep eutectic solvents) offer a number of potential advantages over solid-state drugs; a key question is the role of intermolecular hydrogen bonding interactions in enabling membrane transport. Characterization is challenging since high sample viscosities, typical of liquid pharmaceutical formulations, hamper the use of conventional solution NMR at ambient temperature. Here, we report the application of magic-angle spinning (MAS) NMR spectroscopy to the deep eutectic pharmaceutical, lidocaine ibuprofen. Using variable temperature MAS NMR, the neat system, at a fixed molar ratio, can be studied over a wide range of temperatures, characterized by changing mobility, using a single experimental setup. Specific intermolecular hydrogen bonding interactions are identified by two-dimensional 1H-1H NOESY and ROESY MAS NMR experiments. Hydrogen-bonding dynamics are quantitatively determined by following the chemical exchange process between the labile protons by means of line-width analysis of variable temperature 1H MAS NMR spectra.
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Affiliation(s)
- Sarah K Mann
- Department of Physics , University of Warwick , Coventry CV4 7AL , U.K
| | - Tran N Pham
- GSK R&D , Stevenage , Hertfordshire SG1 2NY , U.K
| | - Lisa L McQueen
- GSK R&D , Collegeville , Pennsylvania 19426 , United States
| | | | - Steven P Brown
- Department of Physics , University of Warwick , Coventry CV4 7AL , U.K
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13
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Yarava JR, Nishiyama Y, Raghothama S, Ramanathan KV. Conformational investigation of peptides using solid-state NMR spectroscopy-A study of polymorphism of β-turn peptides containing diprolines. Chem Biol Drug Des 2019; 95:394-407. [PMID: 31755652 DOI: 10.1111/cbdd.13649] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 11/02/2019] [Accepted: 11/16/2019] [Indexed: 11/26/2022]
Abstract
The construction of complex protein folds relies on the precise conversion of a linear polypeptide chain into a compact 3-dimensional structure. In this context, study of isolated secondary structural modules containing short stretches of amino acids assumes significance. Additionally, peptides, both natural and synthetic, play a major role as potential drugs. With a view to understand the local conformations adopted by peptides in the solid state, we propose a multinuclear NMR approach utilizing spectra of nuclei in their natural isotopic abundance. Various solid-state NMR experiments have been utilized for assignment of the spectra. Additionally, the gauge-including projector augmented-wave (GIPAW) calculations were used to confirm the assignments. Particularly, the utility of the double-quantum-single-quantum correlation experiments is highlighted for the purpose of assignment and for inferring the conformation across the peptide bond. The methodology is illustrated for the case of designed peptides containing diproline residues occurring at the β-turns for identifying their cis-trans conformational polymorphism. The proposed method promises to be of use in the study of conformations of small- to medium-sized peptides such as antimicrobial peptides and in the study of polymorphism leading to applications in drug development protocols.
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Affiliation(s)
- Jayasubba Reddy Yarava
- NMR Research Centre, Indian Institute of Science, Bangalore, India.,Department of Physics, Indian Institute of Science, Bangalore, India
| | - Yusuke Nishiyama
- JEOL RESONANCE Inc., Musashino, Akishima, Japan.,RIKEN-JEOL Collaboration Center, Tsurumi, Yokohama, Japan
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14
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Dale BL, Halcovitch NR, Peach MJG, Griffin JM. Investigation of structure and dynamics in a photochromic molecular crystal by NMR crystallography. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2019; 57:230-242. [PMID: 30452093 DOI: 10.1002/mrc.4805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 11/01/2018] [Accepted: 11/07/2018] [Indexed: 06/09/2023]
Abstract
A photochromic anil, N-(3,5-di-t-butylsalicylidene)-4-amino-pyridine, has been studied by single-crystal X-ray diffraction, multinuclear magic-angle spinning NMR, and first-principles density functional theory (DFT) calculations. Interpretation of the solid-state NMR data on the basis of calculated chemical shifts confirms the structure is primarily composed of molecules in the ground-state enol tautomer, whereas thermally activated cis-keto and photoisomerised trans-keto states exist as low-level defects with populations that are too low to detect experimentally. Variable temperature 13 C NMR data reveal evidence for solid-state dynamics, which is found to be associated with fast rotational motion of t-butyl groups and 180° flips of the pyridine ring, contrasting the time-averaged structure obtained by X-ray diffraction. Comparison of calculated chemical shifts for the full crystal structure and an isolated molecule also reveals evidence for an intermolecular hydrogen bond involving the pyridine ring and an adjacent imine carbon, which facilitates the flipping motion. The DFT calculations also reveal that the molecular conformation in the crystal structure is very close to the energetic minimum for an isolated molecule, indicating that the ring dynamics arise as a result of considerable steric freedom of the pyridine ring and which also allows the molecule to adopt a favourable conformation for photochromism.
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Affiliation(s)
- Benjamin L Dale
- Department of Chemistry, Lancaster University, Lancaster, UK
| | | | | | - John M Griffin
- Department of Chemistry, Lancaster University, Lancaster, UK
- Materials Science Institute, Lancaster University, Lancaster, UK
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15
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Venâncio T, Oliveira LM, Ellena J, Boechat N, Brown SP. Probing intermolecular interactions in a diethylcarbamazine citrate salt by fast MAS 1H solid-state NMR spectroscopy and GIPAW calculations. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 87:73-79. [PMID: 28342733 DOI: 10.1016/j.ssnmr.2017.02.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Revised: 02/24/2017] [Accepted: 02/27/2017] [Indexed: 06/06/2023]
Abstract
Fast magic-angle spinning (MAS) NMR is used to probe intermolecular interactions in a diethylcarbamazine salt, that is widely used as a treatment against adult worms of Wuchereria bancrofti which cause a common disease in tropical countries named filariasis. Specifically, a dihydrogen citrate salt that has improved thermal stability and solubility as compared to the free form is studied. One-dimensional 1H, 13C and 15N and two-dimensional 1H-13C and 14N-1H heteronuclear correlation NMR experiments under moderate and fast MAS together with GIPAW (CASTEP) calculations enable the assignment of the 1H, 13C and 14N/15N resonances. A two-dimensional 1H-1H double-quantum (DQ) -single-quantum (SQ) MAS spectrum recorded with BaBa recoupling at 60kHz MAS identifies specific proton-proton proximities associated with citrate-citrate and citrate-diethylcarbamazine intermolecular interactions.
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Affiliation(s)
- Tiago Venâncio
- Departamento de Química, Universidade Federal de São Carlos, Rodovia Washington Luis, km 235, São Carlos, SP 13565-905, Brazil; Department of Physics, University of Warwick, Coventry CV4 7AL, UK.
| | - Lyege Magalhaes Oliveira
- Departamento de Química, Universidade Federal de São Carlos, Rodovia Washington Luis, km 235, São Carlos, SP 13565-905, Brazil
| | - Javier Ellena
- Instituto de Física de São Carlos, Universidade de São Paulo, Av. Trabalhador são-carlense, 400, São Carlos, SP 13566-590, Brazil
| | - Nubia Boechat
- Fundação Oswaldo Cruz - FioCruz, Instituto de Tecnologia em Fármacos-FarManguinhos, Rua Sizenando Nabuco 100, Rio de Janeiro, RJ 21041-250, Brazil
| | - Steven P Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, UK
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16
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Hayashi S, Jimura K. Detailed mechanisms of 1H spin-lattice relaxation in ammonium dihydrogen phosphate confirmed by magic angle spinning. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 87:24-28. [PMID: 28728051 DOI: 10.1016/j.ssnmr.2017.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 07/04/2017] [Accepted: 07/05/2017] [Indexed: 06/07/2023]
Abstract
Mechanisms of the 1H spin-lattice relaxation in NH4H2PO4 were studied in detail by use of the effect of magic angle spinning on the relaxation. The acid and the ammonium protons have different relaxation times at the spinning rates higher than 10 kHz due to suppression of spin diffusion between the two kinds of protons. The intrinsic relaxation times not affected by the spin diffusion and the spin-diffusion assisted relaxation times were evaluated separately, taking into consideration temperature dependence. Both mechanisms contribute to the 1H relaxation of the acid protons comparatively. The spin-diffusion assisted relaxation mechanism was suppressed to the level lower than the experimental errors at the spinning rate of 30 kHz.
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Affiliation(s)
- Shigenobu Hayashi
- Research Institute for Material and Chemical Measurement, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan.
| | - Keiko Jimura
- Research Institute for Material and Chemical Measurement, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
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17
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Miah HK, Cresswell R, Iuga D, Titman JJ. 1H CSA parameters by ultrafast MAS NMR: Measurement and applications to structure refinement. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 87:67-72. [PMID: 28216036 DOI: 10.1016/j.ssnmr.2017.02.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 02/03/2017] [Accepted: 02/08/2017] [Indexed: 05/27/2023]
Abstract
A 1H anisotropic-isotropic chemical shift correlation experiment which employs symmetry-based recoupling sequences to reintroduce the chemical shift anisotropy in ν1 and ultrafast MAS to resolve 1H sites in ν2 is described. This experiment is used to measure 1H shift parameters for L-ascorbic acid, a compound with a relatively complex hydrogen-bonding network in the solid. The 1H CSAs of hydrogen-bonded sites with resolved isotropic shifts can be extracted directly from the recoupled lineshapes. In combination with DFT calculations, hydrogen positions in crystal structures obtained from X-ray and neutron diffraction are refined by comparison with simulations of the full two-dimensional NMR spectrum. The improved resolution afforded by the second dimension allows even unresolved hydrogen-bonded sites 1H to be assigned and their shift parameters to be obtained.
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Affiliation(s)
- Habeeba K Miah
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Rosalie Cresswell
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Dinu Iuga
- UK 850 MHz Solid-state NMR Facility, Department of Physics, Millburn House, University of Warwick, Coventry CV4 7AL, UK
| | - Jeremy J Titman
- UK 850 MHz Solid-state NMR Facility, Department of Physics, Millburn House, University of Warwick, Coventry CV4 7AL, UK.
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18
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Malon M, Pandey MK, Nishiyama Y. Revealing the Local Proton Network through Three-Dimensional 13C/ 1H Double-Quantum/ 1H Single-Quantum and 1H Double-Quantum/ 13C/ 1H Single-Quantum Correlation Fast Magic-Angle Spinning Solid-State NMR Spectroscopy at Natural Abundance. J Phys Chem B 2017; 121:8123-8131. [PMID: 28782953 DOI: 10.1021/acs.jpcb.7b06203] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
1H double quantum (DQ)/1H single quantum (SQ) correlation solid-state NMR spectroscopy is widely used to obtain internuclear 1H-1H proximities, especially at fast magic-angle spinning (MAS) rate (>60 kHz). However, to date, 1H signals are not well-resolved because of intense 1H-1H homonuclear dipolar interactions even at the attainable maximum MAS frequencies of ∼100 kHz and/or under 1H-1H homonuclear dipolar decoupling irradiations. Here we introduce novel three-dimensional (3D) experiments to resolve the 1H DQ/1H SQ correlation peaks using the additional 13C dimension. Although the low natural abundance of 13C (1.1%) significantly reduces the sensitivities, the 1H indirect measurements alleviate this issue and make this experiment possible even in naturally abundant samples. The two different implementations of 13C/1H DQ/1H SQ correlations and 1H DQ/13C/1H SQ correlations are discussed and demonstrated using l-histidine·HCl·H2O at natural abundance to reveal the local 1H-1H networks near each 13C. In addition, the complete 1H resonance assignments are achieved from a single 3D 13C/1H DQ/1H SQ experiment. We have also demonstrated the applicability of our proposed method on a biologically relevant molecule, capsaicin.
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Affiliation(s)
- Michal Malon
- RIKEN CLST-JEOL Collaboration Center, Yokohama, Kanagawa 230-0045, Japan.,JEOL RESONANCE Inc., Akishima, Tokyo 196-8558, Japan
| | - Manoj Kumar Pandey
- Department of Chemistry, Indian Institute of Technology Ropar , Rupnagar, Punjab 140001, India
| | - Yusuke Nishiyama
- RIKEN CLST-JEOL Collaboration Center, Yokohama, Kanagawa 230-0045, Japan.,JEOL RESONANCE Inc., Akishima, Tokyo 196-8558, Japan
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19
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Brus J, Urbanova M, Czernek J, Pavelkova M, Kubova K, Vyslouzil J, Abbrent S, Konefal R, Horský J, Vetchy D, Vysloužil J, Kulich P. Structure and Dynamics of Alginate Gels Cross-Linked by Polyvalent Ions Probed via Solid State NMR Spectroscopy. Biomacromolecules 2017. [PMID: 28636347 DOI: 10.1021/acs.biomac.7b00627] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Alginate gels are an outstanding biomaterial widely applicable in tissue engineering, medicine, and pharmacy for cell transplantation, wound healing and efficient bioactive agent delivery, respectively. This contribution provides new and comprehensive insight into the atomic-resolution structure and dynamics of polyvalent ion-cross-linked alginate gels in microbead formulations. By applying various advanced solid-state NMR (ssNMR) spectroscopy techniques, we verified the homogeneous distribution of the cross-linking ions in the alginate gels and the high degree of ion exchange. We also established that the two-component character of the alginate gels arises from the concentration fluctuations of residual water molecules that are preferentially localized along polymer chains containing abundant mannuronic acid (M) residues. These hydrated M-rich blocks tend to self-aggregate into subnanometer domains. The resulting coexistence of two types of alginate chains differing in segmental dynamics was revealed by 1H-13C dipolar profile analysis, which indicated that the average fluctuation angles of the stiff and mobile alginate segments were about 5-9° or 30°, respectively. Next, the 13C CP/MAS NMR spectra indicated that the alginate polymer microstructure was strongly dependent on the type of cross-linking ion. The polymer chain regularity was determined to systematically decrease as the cross-linking ion radius decreased. Consistent with the 1H-1H correlation spectra, regular structures were found for the gels cross-linked by relatively large alkaline earth cations (Ba2+, Sr2+, or Ca2+), whereas the alginate chains cross-linked by bivalent transition metal ions (Zn2+) and trivalent metal cations (Al3+) exhibited significant irregularities. Notably, however, the observed disordering of the alginate chains was exclusively attributed to the M residues, whereas the structurally well-defined gels all contained guluronic acid (G) residues. Therefore, a key role of the units in M-rich blocks as mediators promoting the self-assembly of alginate chains was experimentally confirmed. Finally, combining 2D 27Al 3Q/MAS NMR spectroscopy with density functional theory (DFT) calculations provided previously unreported insight into the structure of the Al3+ cross-linking centers. Notably, even with a low residual amount of water, these cross-linking units adopt exclusively 6-fold octahedral coordination and exhibit significant motion, which considerably reduces quadrupolar coupling constants. Thus, the experimental strategy presented in this study provides a new perspective on cross-linked alginate structure and dynamics for which high-quality diffraction data at the atomic resolution level are inherently unavailable.
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Affiliation(s)
- Jiri Brus
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Martina Urbanova
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Jiri Czernek
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Miroslava Pavelkova
- University of Veterinary and Pharmaceutical Sciences , Faculty of Pharmacy, Department of Pharmaceutics, Palackeho tr. 1946/1, 612 42 Brno, Czech Republic
| | - Katerina Kubova
- University of Veterinary and Pharmaceutical Sciences , Faculty of Pharmacy, Department of Pharmaceutics, Palackeho tr. 1946/1, 612 42 Brno, Czech Republic
| | - Jakub Vyslouzil
- University of Veterinary and Pharmaceutical Sciences , Faculty of Pharmacy, Department of Pharmaceutics, Palackeho tr. 1946/1, 612 42 Brno, Czech Republic
| | - Sabina Abbrent
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Rafal Konefal
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - Jiri Horský
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Heyrovsky sq. 2, 162 06 Prague 6, Czech Republic
| | - David Vetchy
- University of Veterinary and Pharmaceutical Sciences , Faculty of Pharmacy, Department of Pharmaceutics, Palackeho tr. 1946/1, 612 42 Brno, Czech Republic
| | - Jan Vysloužil
- Department of Biochemistry, Faculty of Science, Masaryk University , Kotlářská 267/2, 611 37, Brno, Czech Republic
| | - Pavel Kulich
- Department of Chemistry and Toxicology, Veterinary Research Institute , Hudcova 296/70, 621 00, Brno, Czech Republic
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20
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Pöppler AC, Corlett EK, Pearce H, Seymour MP, Reid M, Montgomery MG, Brown SP. Single-crystal X-ray diffraction and NMR crystallography of a 1:1 cocrystal of dithianon and pyrimethanil. Acta Crystallogr C Struct Chem 2017; 73:149-156. [PMID: 28257008 PMCID: PMC5391860 DOI: 10.1107/s2053229617000870] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 01/17/2017] [Indexed: 11/11/2022] Open
Abstract
A single-crystal X-ray diffraction structure of a 1:1 cocrystal of two fungicides, namely dithianon (DI) and pyrimethanil (PM), is reported [systematic name: 5,10-dioxo-5H,10H-naphtho[2,3-b][1,4]dithiine-2,3-dicarbonitrile-4,6-dimethyl-N-phenylpyrimidin-2-amine (1/1), C14H4N2O2S2·C12H13N2]. Following an NMR crystallography approach, experimental solid-state magic angle spinning (MAS) NMR spectra are presented together with GIPAW (gauge-including projector augmented wave) calculations of NMR chemical shieldings. Specifically, experimental 1H and 13C chemical shifts are determined from two-dimensional 1H-13C MAS NMR correlation spectra recorded with short and longer contact times so as to probe one-bond C-H connectivities and longer-range C...H proximities, whereas H...H proximities are identified in a 1H double-quantum (DQ) MAS NMR spectrum. The performing of separate GIPAW calculations for the full periodic crystal structure and for isolated molecules allows the determination of the change in chemical shift upon going from an isolated molecule to the full crystal structure. For the 1H NMR chemical shifts, changes of 3.6 and 2.0 ppm correspond to intermolecular N-H...O and C-H...O hydrogen bonding, while changes of -2.7 and -1.5 ppm are due to ring current effects associated with C-H...π interactions. Even though there is a close intermolecular S...O distance of 3.10 Å, it is of note that the molecule-to-crystal chemical shifts for the involved sulfur or oxygen nuclei are small.
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Affiliation(s)
- Ann-Christin Pöppler
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
- Department of Organic Chemistry, University of Würzburg, 97074 Würzburg, Germany
| | - Emily K. Corlett
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
- Molecular Analytical Science Centre for Doctoral Training, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Harriet Pearce
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
- Molecular Analytical Science Centre for Doctoral Training, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Mark P. Seymour
- International Research Centre, Syngenta, Jealott’s Hill, Bracknell, Berkshire RG42 6EY, United Kingdom
| | - Matthew Reid
- International Research Centre, Syngenta, Jealott’s Hill, Bracknell, Berkshire RG42 6EY, United Kingdom
- Afton Chemical, London Road, Bracknell, Berkshire RG12 2UW, United Kingdom
| | - Mark G. Montgomery
- International Research Centre, Syngenta, Jealott’s Hill, Bracknell, Berkshire RG42 6EY, United Kingdom
| | - Steven P. Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
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21
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Pöppler AC, Walker D, Brown SP. A combined NMR crystallographic and PXRD investigation of the structure-directing role of water molecules in orotic acid and its lithium and magnesium salts. CrystEngComm 2017. [DOI: 10.1039/c6ce02101h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Nemausat R, Gervais C, Brouder C, Trcera N, Bordage A, Coelho-Diogo C, Florian P, Rakhmatullin A, Errea I, Paulatto L, Lazzeri M, Cabaret D. Temperature dependence of X-ray absorption and nuclear magnetic resonance spectra: probing quantum vibrations of light elements in oxides. Phys Chem Chem Phys 2017; 19:6246-6256. [DOI: 10.1039/c6cp08393e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Probing the quantum thermal fluctuations of nuclei in light-element oxides using XANES and NMR spectroscopies.
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Affiliation(s)
- Ruidy Nemausat
- Sorbonne Universités
- UPMC Univ Paris 06
- IMPMC
- UMR CNRS 7590
- F-75005 Paris
| | - Christel Gervais
- Sorbonne Universités
- UPMC Univ Paris 06
- LCMCP
- Collège de France
- UMR CNRS 7574
| | - Christian Brouder
- Sorbonne Universités
- UPMC Univ Paris 06
- IMPMC
- UMR CNRS 7590
- F-75005 Paris
| | - Nicolas Trcera
- Synchrotron SOLEIL
- L'Orme des Merisiers
- F-91192 Gif sur Yvette
- France
| | - Amélie Bordage
- ICMMO
- Univ Paris Sud
- Univ Paris-Saclay
- UMR CNRS 8182
- F-91405 Orsay
| | | | | | | | - Ion Errea
- Fisika Aplikatua 1 Saila
- Bilboko Ingeniaritza Eskola
- University of the Basque Country (UPV/EHU)
- 48013 Bilbao
- Spain
| | - Lorenzo Paulatto
- Sorbonne Universités
- UPMC Univ Paris 06
- IMPMC
- UMR CNRS 7590
- F-75005 Paris
| | - Michele Lazzeri
- Sorbonne Universités
- UPMC Univ Paris 06
- IMPMC
- UMR CNRS 7590
- F-75005 Paris
| | - Delphine Cabaret
- Sorbonne Universités
- UPMC Univ Paris 06
- IMPMC
- UMR CNRS 7590
- F-75005 Paris
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23
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Peng YJ, Liu YL, Hao JH, Zhang RC, Sun PC. Phase structure and dynamics of polystyrene/poly(vinyl methyl ether) blend studied using solid-state NMR. RSC Adv 2017. [DOI: 10.1039/c7ra12287j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this work, solid-state 1H NMR experiments were conducted to fully characterize the dynamic characteristics of a polystyrene/poly(vinyl methyl ether) blend with a mass ratio of 3 : 1 (PS/PVME 75/25).
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Affiliation(s)
- Yong-jin Peng
- Teaching and Research Section of Physics
- College of Comprehensive Studies
- Jinzhou Medical University
- Jinzhou 121001
- P. R. China
| | - Yu-ling Liu
- Teaching and Research Section of Physics
- College of Comprehensive Studies
- Jinzhou Medical University
- Jinzhou 121001
- P. R. China
| | - Jun-hua Hao
- Department of Physics
- Tianjin University Ren'ai College
- Tianjin 301636
- P. R. China
| | - Rong-chun Zhang
- College of Chemistry
- Nankai University
- Tianjin 300071
- P. R. China
| | - Ping-chuan Sun
- College of Chemistry
- Nankai University
- Tianjin 300071
- P. R. China
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24
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Reddy GNM, Malon M, Marsh A, Nishiyama Y, Brown SP. Fast Magic-Angle Spinning Three-Dimensional NMR Experiment for Simultaneously Probing H—H and N—H Proximities in Solids. Anal Chem 2016; 88:11412-11419. [DOI: 10.1021/acs.analchem.6b01869] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
| | - Michal Malon
- JEOL RESONANCE Inc., Musashino, Akishima,
Tokyo 196-8558, Japan
- RIKEN CLST-JEOL Collaboration Centre, Yokohama, Kanagawa 230-0045, Japan
| | | | - Yusuke Nishiyama
- JEOL RESONANCE Inc., Musashino, Akishima,
Tokyo 196-8558, Japan
- RIKEN CLST-JEOL Collaboration Centre, Yokohama, Kanagawa 230-0045, Japan
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25
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Mote KR, Agarwal V, Madhu PK. Five decades of homonuclear dipolar decoupling in solid-state NMR: Status and outlook. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2016; 97:1-39. [PMID: 27888838 DOI: 10.1016/j.pnmrs.2016.08.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Revised: 07/11/2016] [Accepted: 08/02/2016] [Indexed: 06/06/2023]
Abstract
It has been slightly more than fifty years since the first homonuclear spin decoupling scheme, Lee-Goldburg decoupling, was proposed for removing homonuclear dipolar interactions in solid-state nuclear magnetic resonance. A family of such schemes has made observation of high-resolution NMR spectra of abundant spins possible in various applications in solid state. This review outlines the strategies used in this field and the future prospects of homonuclear spin decoupling in solid-state NMR.
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Affiliation(s)
- Kaustubh R Mote
- TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, 21 Brundavan Colony, Narsingi, Hyderabad 500 075, India
| | - Vipin Agarwal
- TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, 21 Brundavan Colony, Narsingi, Hyderabad 500 075, India
| | - P K Madhu
- TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, 21 Brundavan Colony, Narsingi, Hyderabad 500 075, India; Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
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26
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Valla M, Wischert R, Comas-Vives A, Conley MP, Verel R, Copéret C, Sautet P. Role of Tricoordinate Al Sites in CH3ReO3/Al2O3 Olefin Metathesis Catalysts. J Am Chem Soc 2016; 138:6774-85. [DOI: 10.1021/jacs.6b00447] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Maxence Valla
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Vladimir
Prelog Weg 1-5, 8093 Zurich, Switzerland
| | - Raphael Wischert
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Vladimir
Prelog Weg 1-5, 8093 Zurich, Switzerland
| | - Aleix Comas-Vives
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Vladimir
Prelog Weg 1-5, 8093 Zurich, Switzerland
| | - Matthew P. Conley
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Vladimir
Prelog Weg 1-5, 8093 Zurich, Switzerland
| | - René Verel
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Vladimir
Prelog Weg 1-5, 8093 Zurich, Switzerland
| | - Christophe Copéret
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Vladimir
Prelog Weg 1-5, 8093 Zurich, Switzerland
| | - Philippe Sautet
- Univ Lyon, Ens de Lyon, CNRS, Université Lyon 1, Laboratoire de Chimie UMR 5182, F 69342 Lyon, France
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27
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Pinon A, Rossini AJ, Widdifield CM, Gajan D, Emsley L. Polymorphs of Theophylline Characterized by DNP Enhanced Solid-State NMR. Mol Pharm 2015; 12:4146-53. [PMID: 26393368 PMCID: PMC4699642 DOI: 10.1021/acs.molpharmaceut.5b00610] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 09/15/2015] [Accepted: 09/22/2015] [Indexed: 11/29/2022]
Abstract
We show how dynamic nuclear polarization (DNP) enhanced solid-state NMR spectroscopy can be used to characterize polymorphs and solvates of organic solids. We applied DNP to three polymorphs and one hydrated form of the asthma drug molecule theophylline. For some forms of theophylline, sample grinding and impregnation with the radical-containing solution, which are necessary to prepare the samples for DNP, were found to induce polymorphic transitions or desolvation between some forms. We present protocols for sample preparation for solid-state magic-angle spinning (MAS) DNP experiments that avoid the polymorphic phase transitions in theophylline. These protocols include cryogrinding, grinding under inert atmosphere, and the appropriate choice of the impregnating liquid. By applying these procedures, we subsequently demonstrate that two-dimensional correlation experiments, such as (1)H-(13)C and (1)H-(15)N HETCOR or (13)C-(13)C INADEQUATE, can be obtained at natural isotopic abundance in reasonable times, thus enabling more advanced structural characterization of polymorphs.
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Affiliation(s)
- Arthur
C. Pinon
- Institut
des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
- Institut
de Sciences Analytiques (CNRS/ENS de Lyon/UCB-Lyon 1), Centre de RMN
à Très Hauts Champs, Université
de Lyon, 69100 Villeurbanne, France
| | - Aaron J. Rossini
- Institut
des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
- Institut
de Sciences Analytiques (CNRS/ENS de Lyon/UCB-Lyon 1), Centre de RMN
à Très Hauts Champs, Université
de Lyon, 69100 Villeurbanne, France
| | - Cory M. Widdifield
- Institut
de Sciences Analytiques (CNRS/ENS de Lyon/UCB-Lyon 1), Centre de RMN
à Très Hauts Champs, Université
de Lyon, 69100 Villeurbanne, France
| | - David Gajan
- Institut
de Sciences Analytiques (CNRS/ENS de Lyon/UCB-Lyon 1), Centre de RMN
à Très Hauts Champs, Université
de Lyon, 69100 Villeurbanne, France
| | - Lyndon Emsley
- Institut
des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
- Institut
de Sciences Analytiques (CNRS/ENS de Lyon/UCB-Lyon 1), Centre de RMN
à Très Hauts Champs, Université
de Lyon, 69100 Villeurbanne, France
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28
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Dervişoğlu R, Middlemiss D, Blanc F, Lee YL, Morgan D, Grey CP. Joint Experimental and Computational 17O and 1H Solid State NMR Study of Ba 2In 2O 4(OH) 2 Structure and Dynamics. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2015; 27:3861-3873. [PMID: 26321789 PMCID: PMC4547502 DOI: 10.1021/acs.chemmater.5b00328] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 05/01/2015] [Indexed: 05/20/2023]
Abstract
A structural characterization of the hydrated form of the brownmillerite-type phase Ba2In2O5, Ba2In2O4(OH)2, is reported using experimental multinuclear NMR spectroscopy and density functional theory (DFT) energy and GIPAW NMR calculations. When the oxygen ions from H2O fill the inherent O vacancies of the brownmillerite structure, one of the water protons remains in the same layer (O3) while the second proton is located in the neighboring layer (O2) in sites with partial occupancies, as previously demonstrated by Jayaraman et al. (Solid State Ionics2004, 170, 25-32) using X-ray and neutron studies. Calculations of possible proton arrangements within the partially occupied layer of Ba2In2O4(OH)2 yield a set of low energy structures; GIPAW NMR calculations on these configurations yield 1H and 17O chemical shifts and peak intensity ratios, which are then used to help assign the experimental MAS NMR spectra. Three distinct 1H resonances in a 2:1:1 ratio are obtained experimentally, the most intense resonance being assigned to the proton in the O3 layer. The two weaker signals are due to O2 layer protons, one set hydrogen bonding to the O3 layer and the other hydrogen bonding alternately toward the O3 and O1 layers. 1H magnetization exchange experiments reveal that all three resonances originate from protons in the same crystallographic phase, the protons exchanging with each other above approximately 150 °C. Three distinct types of oxygen atoms are evident from the DFT GIPAW calculations bare oxygens (O), oxygens directly bonded to a proton (H-donor O), and oxygen ions that are hydrogen bonded to a proton (H-acceptor O). The 17O calculated shifts and quadrupolar parameters are used to assign the experimental spectra, the assignments being confirmed by 1H-17O double resonance experiments.
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Affiliation(s)
- Rıza Dervişoğlu
- Department
of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Derek
S. Middlemiss
- Department
of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Frédéric Blanc
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Yueh-Lin Lee
- Department
of Materials Science and Engineering, University
of Wisconsin, Madison, Wisconsin 53706, United States
| | - Dane Morgan
- Department
of Materials Science and Engineering, University
of Wisconsin, Madison, Wisconsin 53706, United States
| | - Clare P. Grey
- Department
of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
- E-mail:
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29
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Asakura T, Okushita K, Williamson MP. Analysis of the Structure of Bombyx mori Silk Fibroin by NMR. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00160] [Citation(s) in RCA: 134] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Tetsuo Asakura
- Department
of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
- Institute for
Molecular Science, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan
| | - Keiko Okushita
- Department
of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
| | - Mike P. Williamson
- Department
of Molecular Biology and Biotechnology, University of Sheffield, Firth Court,
Western Bank, Sheffield S10 2TN, U.K
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30
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Kim G, Griffin JM, Blanc F, Haile SM, Grey CP. Characterization of the dynamics in the protonic conductor CsH₂PO₄ by ¹⁷O solid-state NMR spectroscopy and first-principles calculations: correlating phosphate and protonic motion. J Am Chem Soc 2015; 137:3867-76. [PMID: 25732257 PMCID: PMC4519985 DOI: 10.1021/jacs.5b00280] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
![]()
17O NMR spectroscopy combined with first-principles
calculations was employed to understand the local structure and dynamics
of the phosphate ions and protons in the paraelectric phase of the
proton conductor CsH2PO4. For the room-temperature
structure, the results confirm that one proton (H1) is localized in
an asymmetric H-bond (between O1 donor and O2 acceptor oxygen atoms),
whereas the H2 proton undergoes rapid exchange between two sites in
a hydrogen bond with a symmetric double potential well at a rate ≥107 Hz. Variable-temperature 17O NMR spectra recorded
from 22 to 214 °C were interpreted by considering different models
for the rotation of the phosphate anions. At least two distinct rate
constants for rotations about four pseudo C3 axes of the
phosphate ion were required in order to achieve good agreement with
the experimental data. An activation energy of 0.21 ± 0.06 eV
was observed for rotation about the P–O1 axis, with a higher
activation energy of 0.50 ± 0.07 eV being obtained for rotation
about the P–O2, P–O3d, and P–O3a axes, with the superscripts denoting, respectively, dynamic
donor and acceptor oxygen atoms of the H-bond. The higher activation
energy of the second process is most likely associated with the cost
of breaking an O1–H1 bond. The activation energy of this process
is slightly lower than that obtained from the 1H exchange
process (0.70 ± 0.07 eV) (Kim,
G.; Blanc, F.; Hu, Y.-Y.; Grey, C. P. J. Phys. Chem. C2013, 117, 6504−6515) associated with the translational motion
of the protons. The relationship between proton jumps and phosphate
rotation was analyzed in detail by considering uncorrelated motion,
motion of individual PO4 ions and the four connected/H-bonded
protons, and concerted motions of adjacent phosphate units, mediated
by proton hops. We conclude that, while phosphate rotations aid proton
motion, not all phosphate rotations result in proton jumps.
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Affiliation(s)
- Gunwoo Kim
- †Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - John M Griffin
- †Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Frédéric Blanc
- †Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Sossina M Haile
- ‡Materials Science, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, United States
| | - Clare P Grey
- †Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom.,§Department of Chemistry, Stony Brook University, Stony Brook, New York 11790-3400, United States
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31
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Reddy GNM, Cook DS, Iuga D, Walton RI, Marsh A, Brown SP. An NMR crystallography study of the hemihydrate of 2', 3'-O-isopropylidineguanosine. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 65:41-48. [PMID: 25686689 DOI: 10.1016/j.ssnmr.2015.01.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 01/05/2015] [Accepted: 01/08/2015] [Indexed: 06/04/2023]
Abstract
An NMR crystallography study of the hemihydrate of 2', 3'-O-isopropylidineguanosine (Gace) is presented, together with powder X-ray diffraction and thermogravimetric analysis. (1)H double-quantum and (14)N-(1)H HMQC spectra recorded at 850MHz and 75kHz MAS (using a JEOL 1mm probe) are presented together with a (1)H-(13)C refocused INEPT spectrum recorded at 500MHz and 12.5kHz MAS using eDUMBO-122(1)H homonuclear decoupling. NMR chemical shieldings are calculated using the GIPAW (gauge-including projector augmented wave) method; good two-dimensional agreement between calculation and experiment is observed for (13)C and (1)H chemical shifts for directly bonded CH and CH3 peaks. There are two Gace molecules in the asymmetric unit cell: differences in specific (1)H chemical shifts are rationalised in terms of the strength of CH-π and intermolecular hydrogen bonding interactions.
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Affiliation(s)
| | - Daniel S Cook
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK
| | - Dinu Iuga
- Department of Physics, University of Warwick, Coventry CV4 7AL, UK
| | - Richard I Walton
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK
| | - Andrew Marsh
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK
| | - Steven P Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, UK.
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32
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Paluch P, Pawlak T, Oszajca M, Lasocha W, Potrzebowski MJ. Fine refinement of solid state structure of racemic form of phospho-tyrosine employing NMR Crystallography approach. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 65:2-11. [PMID: 25240460 DOI: 10.1016/j.ssnmr.2014.08.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Accepted: 08/29/2014] [Indexed: 05/25/2023]
Abstract
We present step by step facets important in NMR Crystallography strategy employing O-phospho-dl-tyrosine as model sample. The significance of three major techniques being components of this approach: solid state NMR (SS NMR), X-ray diffraction of powdered sample (PXRD) and theoretical calculations (Gauge Invariant Projector Augmented Wave; GIPAW) is discussed. Each experimental technique provides different set of structural constraints. From the PXRD measurement the size of the unit cell, space group and roughly refined molecular structure are established. SS NMR provides information about content of crystallographic asymmetric unit, local geometry, molecular motion in the crystal lattice and hydrogen bonding pattern. GIPAW calculations are employed for validation of quality of elucidation and fine refinement of structure. Crystal and molecular structure of O-phospho-dl-tyrosine solved by NMR Crystallography is deposited at Cambridge Crystallographic Data Center under number CCDC 1005924.
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Affiliation(s)
- Piotr Paluch
- Polish Academy of Sciences, Centre of Molecular and Macromolecular Studies, Sienkiewicza 112, PL-90-363 Lodz, Poland
| | - Tomasz Pawlak
- Polish Academy of Sciences, Centre of Molecular and Macromolecular Studies, Sienkiewicza 112, PL-90-363 Lodz, Poland
| | - Marcin Oszajca
- Jerzy Haber Institute of Catalysis and Surface Chemistry, PAS, Niezapominajek 8, 30-239 Krakow, Poland
| | - Wieslaw Lasocha
- Jerzy Haber Institute of Catalysis and Surface Chemistry, PAS, Niezapominajek 8, 30-239 Krakow, Poland; Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland
| | - Marek J Potrzebowski
- Polish Academy of Sciences, Centre of Molecular and Macromolecular Studies, Sienkiewicza 112, PL-90-363 Lodz, Poland.
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33
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Reddy YJ, Ramanathan KV. Assignment of the (13)C NMR spectrum by correlation to dipolar coupled proton-pairs and estimation of order parameters of a thiophene based liquid crystal. Phys Chem Chem Phys 2015; 17:1450-7. [PMID: 25429708 DOI: 10.1039/c4cp04782f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Materials with widely varying molecular topologies and exhibiting liquid crystalline properties have attracted considerable attention in recent years. (13)C NMR spectroscopy is a convenient method for studying such novel systems. In this approach the assignment of the spectrum is the first step which is a non-trivial problem. Towards this end, we propose here a method that enables the carbon skeleton of the different sub-units of the molecule to be traced unambiguously. The proposed method uses a heteronuclear correlation experiment to detect pairs of nearby carbons with attached protons in the liquid crystalline core through correlation of the carbon chemical shifts to the double-quantum coherences of protons generated through the dipolar coupling between them. Supplemented by experiments that identify non-protonated carbons, the method leads to a complete assignment of the spectrum. We initially apply this method for assigning the (13)C spectrum of the liquid crystal 4-n-pentyl-4'-cyanobiphenyl oriented in the magnetic field. We then utilize the method to assign the aromatic carbon signals of a thiophene based liquid crystal thereby enabling the local order-parameters of the molecule to be estimated and the mutual orientation of the different sub-units to be obtained.
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Affiliation(s)
- Y Jayasubba Reddy
- NMR Research Centre, Indian Institute of Science, Bangalore 560012, India.
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34
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Jayasubba Reddy Y, Agarwal V, Lesage A, Emsley L, Ramanathan KV. Heteronuclear proton double quantum-carbon single quantum scalar correlation in solids. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2014; 245:31-37. [PMID: 24921949 DOI: 10.1016/j.jmr.2014.05.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 05/01/2014] [Accepted: 05/05/2014] [Indexed: 06/03/2023]
Abstract
A new NMR experiment that exploits the advantages of proton double quantum (DQ) NMR through a proton DQ-carbon single quantum (SQ) correlation experiment in the solid state is proposed. Analogous to the previously proposed 2D (1)H (DQ)-(13)C refocused INEPT experiment (Webber et al., 2010), the correlation between (1)H and (13)C is achieved through scalar coupling evolution, while the double quantum coherence among protons is generated through dipolar couplings. However, the new experiment relies on (13)C transverse coherence for scalar transfer. The new experiment dubbed MAS-J-(1)H (DQ)-(13)C-HMQC, is particularly suited for unlabeled molecules and can provide higher sensitivity than its INEPT counterpart. The experiment is applied to four different samples.
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Affiliation(s)
- Y Jayasubba Reddy
- NMR Research Centre, Indian Institute of Science, Bangalore 560012, India; Department of Physics, Indian Institute of Science, Bangalore 560012, India
| | - Vipin Agarwal
- NMR Research Centre, Indian Institute of Science, Bangalore 560012, India.
| | - Anne Lesage
- Centre de RMN à Très Hauts Champs, Institut des Sciences Analytiques (CNRS/ENS Lyon/UCB Lyon 1), Université de Lyon, 69100 Villeurbanne, France
| | - Lyndon Emsley
- Centre de RMN à Très Hauts Champs, Institut des Sciences Analytiques (CNRS/ENS Lyon/UCB Lyon 1), Université de Lyon, 69100 Villeurbanne, France
| | - K V Ramanathan
- NMR Research Centre, Indian Institute of Science, Bangalore 560012, India.
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35
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Altheimer BD, Mehta MA. Effects of structural differences on the NMR chemical shifts in isostructural dipeptides. J Phys Chem A 2014; 118:2618-28. [PMID: 24654604 DOI: 10.1021/jp411220y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Porous crystalline dipeptides have gained recent attention for their potential as gas-storage materials. Within this large class is a group of dipeptides containing alanine, valine, and isoleucine with very similar crystal structures. We report the (13)C (carbonyl and Cα) and (15)N (amine and amide) solid-state NMR isotropic chemical shifts in a series of seven such isostructural porous dipeptides as well as shift tensor data for the carbonyl and amide sites. Using their known crystal structures and aided by ab initio quantum chemical calculations for the resonance assignments, we elucidate trends relating local structure, hydrogen-bonding patterns, and chemical shift. We find good correlation between the backbone dihedral angles and the Cα1 and Cα2 shifts. For the C1 shift tensor, the δ11 value shifts downfield as the hydrogen-bond distance increases, δ22 shifts upfield, and δ33 shows little variation. The C2 shift tensor shows no appreciable correlation with structural parameters. For the N2 tensor, δ11 shows little dependence on the hydrogen-bond length, whereas δ22 and δ33 both show a decrease in shielding as the hydrogen bond shortens. Our analysis teases apart some, but not all, structural contributors to the observed differences the solid-state NMR chemical shifts.
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Affiliation(s)
- Benjamin D Altheimer
- Department of Chemistry and Biochemistry, Oberlin College , 119 Woodland Street, Oberlin, Ohio 44074, United States
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36
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Pawlak T, Potrzebowski MJ. Fine refinement of solid-state molecular structures of Leu- and Met-enkephalins by NMR crystallography. J Phys Chem B 2014; 118:3298-309. [PMID: 24605867 DOI: 10.1021/jp500379e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
This paper presents a methodology that allows the fine refinement of the crystal and molecular structure for compounds for which the data deposited in the crystallographic bases are of poor quality. Such species belong to the group of samples with molecular disorder. In the Cambridge Crystallographic Data Center (CCDC), there are approximately 22,000 deposited structures with an R-factor over 10. The powerful methodology we present employs crystal data for Leu-enkephalin (two crystallographic forms) with R-factor values of 14.0 and 8.9 and for Met-enkephalin (one form) with an R-factor of 10.5. NMR crystallography was employed in testing the X-ray data and the quality of the structure refinement. The GIPAW (gauge invariant projector augmented wave) method was used to optimize the coordinates of the enkephalins and to compute NMR parameters. As we reveal, this complementary approach makes it possible to generate a reasonable set of new coordinates that better correlate to real samples. This methodology is general and can be employed in the study of each compound possessing magnetically active nuclei.
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Affiliation(s)
- Tomasz Pawlak
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences , Sienkiewicza 112, 90-363 Lodz, Poland
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37
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Sene S, Berthomieu D, Donnadieu B, Richeter S, Vezzani J, Granier D, Bégu S, Mutin H, Gervais C, Laurencin D. A combined experimental-computational study of benzoxaborole crystal structures. CrystEngComm 2014. [DOI: 10.1039/c4ce00313f] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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38
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Baias M, Dumez JN, Svensson PH, Schantz S, Day GM, Emsley L. De novo determination of the crystal structure of a large drug molecule by crystal structure prediction-based powder NMR crystallography. J Am Chem Soc 2013; 135:17501-7. [PMID: 24168679 DOI: 10.1021/ja4088874] [Citation(s) in RCA: 154] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The crystal structure of form 4 of the drug 4-[4-(2-adamantylcarbamoyl)-5-tert-butyl-pyrazol-1-yl]benzoic acid is determined using a protocol for NMR powder crystallography at natural isotopic abundance combining solid-state (1)H NMR spectroscopy, crystal structure prediction, and density functional theory chemical shift calculations. This is the first example of NMR crystal structure determination for a molecular compound of previously unknown structure, and at 422 g/mol this is the largest compound to which this method has been applied so far.
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Affiliation(s)
- Maria Baias
- Centre de RMN à Très Hauts Champs, CNRS/ENS-Lyon/UCB Lyon 1, Université de Lyon , 5 rue de la Doua, 69100 Villeurbanne, France
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39
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Vogt FG, Williams GR, Copley RC. Solid-State NMR Analysis of a Boron-Containing Pharmaceutical Hydrochloride Salt. J Pharm Sci 2013; 102:3705-16. [DOI: 10.1002/jps.23679] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2013] [Revised: 06/26/2013] [Accepted: 07/01/2013] [Indexed: 01/20/2023]
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40
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Asakura T, Suzuki Y, Yazawa K, Aoki A, Nishiyama Y, Nishimura K, Suzuki F, Kaji H. Determination of Accurate 1H Positions of (Ala-Gly)n as a Sequential Peptide Model of Bombyx mori Silk Fibroin before Spinning (Silk I). Macromolecules 2013. [DOI: 10.1021/ma401531m] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tetsuo Asakura
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Koganei, Tokyo, Japan
- Institute for Molecular Science, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan
| | - Yu Suzuki
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Koganei, Tokyo, Japan
| | - Koji Yazawa
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Koganei, Tokyo, Japan
- JEOL RESONANCE
Inc., 3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan
| | - Akihiro Aoki
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Koganei, Tokyo, Japan
| | - Yusuke Nishiyama
- JEOL RESONANCE
Inc., 3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan
| | - Katsuyuki Nishimura
- Institute for Molecular Science, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan
| | - Furitsu Suzuki
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Hironori Kaji
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
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41
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Concistrè M, Mamone S, Denning M, Pileio G, Lei X, Li Y, Carravetta M, Turro NJ, Levitt MH. Anisotropic nuclear spin interactions in H₂O@C₆₀ determined by solid-state NMR. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2013; 371:20120102. [PMID: 23918716 DOI: 10.1098/rsta.2012.0102] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report a solid-state NMR study of the anisotropic nuclear spin interactions in H₂O@C₆₀ at room temperature. We find evidence of significant dipole-dipole interactions between the water protons, and also a proton chemical shift anisotropy (CSA) interaction. The principal axes of these interaction tensors are found to be perpendicular. The magnitude of the CSA is too large to be explained by a model in which the water molecules are partially aligned with respect to an external axis. The evidence indicates that the observed CSA is caused by a distortion of the geometry or electronic structure of the fullerene cages, in response to the presence of the endohedral water.
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Affiliation(s)
- M Concistrè
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK.
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42
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Widdifield CM, Cavallo G, Facey GA, Pilati T, Lin J, Metrangolo P, Resnati G, Bryce DL. Multinuclear Solid-State Magnetic Resonance as a Sensitive Probe of Structural Changes upon the Occurrence of Halogen Bonding in Co-crystals. Chemistry 2013; 19:11949-62. [DOI: 10.1002/chem.201300809] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 06/10/2013] [Indexed: 01/20/2023]
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43
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Dudenko DV, Williams PA, Hughes CE, Antzutkin ON, Velaga S, Brown SP, Harris KDM. Exploiting the Synergy of Powder X-ray Diffraction and Solid-State NMR Spectroscopy in Structure Determination of Organic Molecular Solids. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2013; 117:12258-12265. [PMID: 24386493 PMCID: PMC3876745 DOI: 10.1021/jp4041106] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Indexed: 05/25/2023]
Abstract
We report a strategy for structure determination of organic materials in which complete solid-state nuclear magnetic resonance (NMR) spectral data is utilized within the context of structure determination from powder X-ray diffraction (XRD) data. Following determination of the crystal structure from powder XRD data, first-principles density functional theory-based techniques within the GIPAW approach are exploited to calculate the solid-state NMR data for the structure, followed by careful scrutiny of the agreement with experimental solid-state NMR data. The successful application of this approach is demonstrated by structure determination of the 1:1 cocrystal of indomethacin and nicotinamide. The 1H and 13C chemical shifts calculated for the crystal structure determined from the powder XRD data are in excellent agreement with those measured experimentally, notably including the two-dimensional correlation of 1H and 13C chemical shifts for directly bonded 13C-1H moieties. The key feature of this combined approach is that the quality of the structure determined is assessed both against experimental powder XRD data and against experimental solid-state NMR data, thus providing a very robust validation of the veracity of the structure.
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Affiliation(s)
- Dmytro V. Dudenko
- School of Chemistry, Cardiff University, Park Place, Cardiff CF10 3AT, Wales,
U.K
- Department of Physics, University of Warwick, Coventry CV4 7AL, England, U.K
| | - P. Andrew Williams
- School of Chemistry, Cardiff University, Park Place, Cardiff CF10 3AT, Wales,
U.K
| | - Colan E. Hughes
- School of Chemistry, Cardiff University, Park Place, Cardiff CF10 3AT, Wales,
U.K
| | - Oleg N. Antzutkin
- Department of Physics, University of Warwick, Coventry CV4 7AL, England, U.K
- Chemistry of Interfaces, Luleå University of Technology, Luleå
S-97187, Sweden
| | - Sitaram
P. Velaga
- Department
of Health Science, Luleå University of Technology, Luleå S-97187, Sweden
| | - Steven P. Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, England, U.K
| | - Kenneth D. M. Harris
- School of Chemistry, Cardiff University, Park Place, Cardiff CF10 3AT, Wales,
U.K
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44
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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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45
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Kuttatheyil AV, Lässig D, Lincke J, Kobalz M, Baias M, König K, Hofmann J, Krautscheid H, Pickard CJ, Haase J, Bertmer M. Synthesis, Crystal Structure, and Solid-State NMR Investigations of Heteronuclear Zn/Co Coordination Networks — A Comparative Study. Inorg Chem 2013; 52:4431-42. [DOI: 10.1021/ic302643w] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
| | - Daniel Lässig
- Universität Leipzig, Fakultät für Chemie und Mineralogie,
Johannisallee 29, D-04103, Germany
| | - Jörg Lincke
- Universität Leipzig, Fakultät für Chemie und Mineralogie,
Johannisallee 29, D-04103, Germany
| | - Merten Kobalz
- Universität Leipzig, Fakultät für Chemie und Mineralogie,
Johannisallee 29, D-04103, Germany
| | - Maria Baias
- Universitè de Lyon, Centre de RMN
à très hauts champs, CNRS/ENS Lyon/UCBL, 5 Rue de la
Doua, 69100 Villeurbanne, France
| | - Katja König
- Institut für Nichtklassische Chemie e. V., Permoserstr.15, D-04318, Germany
| | - Jörg Hofmann
- Institut für Nichtklassische Chemie e. V., Permoserstr.15, D-04318, Germany
| | - Harald Krautscheid
- Universität Leipzig, Fakultät für Chemie und Mineralogie,
Johannisallee 29, D-04103, Germany
| | - Chris J. Pickard
- Department of Physics & Astronomy, University College London, Gower Street, London, United Kingdom
| | - Jürgen Haase
- Universität Leipzig, Fakultät
für Physik und Geowissenschaften, Linnéstr. 5, D-04103,
Germany
| | - Marko Bertmer
- Universität Leipzig, Fakultät
für Physik und Geowissenschaften, Linnéstr. 5, D-04103,
Germany
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Baias M, Widdifield CM, Dumez JN, Thompson HPG, Cooper TG, Salager E, Bassil S, Stein RS, Lesage A, Day GM, Emsley L. Powder crystallography of pharmaceutical materials by combined crystal structure prediction and solid-state 1H NMR spectroscopy. Phys Chem Chem Phys 2013; 15:8069-80. [PMID: 23503809 DOI: 10.1039/c3cp41095a] [Citation(s) in RCA: 137] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A protocol for the ab initio crystal structure determination of powdered solids at natural isotopic abundance by combining solid-state NMR spectroscopy, crystal structure prediction, and DFT chemical shift calculations was evaluated to determine the crystal structures of four small drug molecules: cocaine, flutamide, flufenamic acid, and theophylline. For cocaine, flutamide and flufenamic acid, we find that the assigned (1)H isotropic chemical shifts provide sufficient discrimination to determine the correct structures from a set of predicted structures using the root-mean-square deviation (rmsd) between experimentally determined and calculated chemical shifts. In most cases unassigned shifts could not be used to determine the structures. This method requires no prior knowledge of the crystal structure, and was used to determine the correct crystal structure to within an atomic rmsd of less than 0.12 Å with respect to the known reference structure. For theophylline, the NMR spectra are too simple to allow for unambiguous structure selection.
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Affiliation(s)
- Maria Baias
- Université de Lyon, (CNRS/ENS-Lyon/UCB Lyon 1), Centre de RMN à Très Hauts Champs, 5 rue de la Doua, 69100 Villeurbanne, France
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47
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Chierotti MR, Gobetto R. NMR crystallography: the use of dipolar interactions in polymorph and co-crystal investigation. CrystEngComm 2013. [DOI: 10.1039/c3ce41026a] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Pawlak T, Paluch P, Trzeciak-Karlikowska K, Jeziorna A, Potrzebowski MJ. Study of the thermal processes in molecular crystals of peptides by means of NMR crystallography. CrystEngComm 2013. [DOI: 10.1039/c3ce40090e] [Citation(s) in RCA: 14] [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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49
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Dračínský M, Hodgkinson P. A molecular dynamics study of the effects of fast molecular motions on solid-state NMR parameters. CrystEngComm 2013. [DOI: 10.1039/c3ce40612a] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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50
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Dudenko DV, Yates JR, Harris KDM, Brown SP. An NMR crystallography DFT-D approach to analyse the role of intermolecular hydrogen bonding and π–π interactions in driving cocrystallisation of indomethacin and nicotinamide. CrystEngComm 2013. [DOI: 10.1039/c3ce41240g] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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