1
|
Silva IDA, Bartalucci E, Bolm C, Wiegand T. Opportunities and Challenges in Applying Solid-State NMR Spectroscopy in Organic Mechanochemistry. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2304092. [PMID: 37407000 DOI: 10.1002/adma.202304092] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 06/12/2023] [Accepted: 06/28/2023] [Indexed: 07/07/2023]
Abstract
In recent years it is shown that mechanochemical strategies can be beneficial in directed conversions of organic compounds. Finding new reactions proved difficult, and due to the lack of mechanistic understanding of mechanochemical reaction events, respective efforts have mostly remained empirical. Spectroscopic techniques are crucial in shedding light on these questions. In this overview, the opportunities and challenges of solid-state nuclear magnetic resonance (NMR) spectroscopy in the field of organic mechanochemistry are discussed. After a brief discussion of the basics of high-resolution solid-state NMR under magic-angle spinning (MAS) conditions, seven opportunities for solid-state NMR in the field of organic mechanochemistry are presented, ranging from ex situ approaches to structurally elucidated reaction products obtained by milling to the potential and limitations of in situ solid-state NMR approaches. Particular strengths of solid-state NMR, for instance in differentiating polymorphs, in NMR-crystallographic structure-determination protocols, or in detecting weak noncovalent interactions in molecular-recognition events employing proton-detected solid-state NMR experiments at fast MAS frequencies, are discussed.
Collapse
Affiliation(s)
| | - Ettore Bartalucci
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim/Ruhr, Germany
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074, Aachen, Germany
| | - Carsten Bolm
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Thomas Wiegand
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim/Ruhr, Germany
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074, Aachen, Germany
| |
Collapse
|
2
|
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: 7] [Impact Index Per Article: 7.0] [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.
Collapse
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.
| |
Collapse
|
3
|
Raval P, Trébosc J, Pawlak T, Nishiyama Y, Brown SP, Manjunatha Reddy GN. Combining heteronuclear correlation NMR with spin-diffusion to detect relayed Cl-H-H and N-H-H proximities in molecular solids. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2022; 120:101808. [PMID: 35780556 DOI: 10.1016/j.ssnmr.2022.101808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 06/11/2022] [Accepted: 06/12/2022] [Indexed: 06/15/2023]
Abstract
Analysis of short-to-intermediate range intermolecular interactions offers a great way of characterizing the solid-state organization of small molecules and materials. This can be achieved by two-dimensional (2D) homo- and heteronuclear correlation NMR spectroscopy, for example, by carrying out experiments at high magnetic fields in conjunction with fast magic-angle spinning (MAS) techniques. But, detecting 2D peaks for heteronuclear dipolar coupled spin pairs separated by greater than 3 Å is not always straightforward, particularly when low-gamma quadrupolar nuclei are involved. Here, we present a 2D correlation NMR experiment that combines the advantages of heteronuclear-multiple quantum coherence (HMQC) and proton-based spin-diffusion (SD) pulse sequences using radio-frequency-driven-recouping (RFDR) to probe inter and intramolecular 1H-X (X = 14N, 35Cl) interactions. This experiment can be used to acquire 2D 1H{X}-HMQC filtered 1H-1H correlation as well as 2D 1H-X HMQC spectra. Powder forms of dopamine·HCl and l-histidine·HCl·H2O are characterized at high fields (21.1 T and 18.8 T) with fast MAS (60 kHz) using the 2D HMQC-SD-RFDR approach. Solid-state NMR results are complemented with NMR crystallography analyses using the gauge-including projector augmented wave (GIPAW) approach. For histidine·HCl·H2O, 2D peaks associated with 14N-1H-1H and 35Cl-1H-1H distances of up to 4.4 and 3.9 Å have been detected. This is further corroborated by the observation of 2D peaks corresponding to 14N-1H-1H and 35Cl-1H-1H distances of up to 4.2 and 3.7 Å in dopamine·HCl, indicating the suitability of the HMQC-SD-RFDR experiments for detecting medium-range proximities in molecular solids.
Collapse
Affiliation(s)
- Parth Raval
- University of Lille, CNRS, Centrale Lille Institut, Univ. Artois, UMR 8181-UCCS- Unité de Catalyse et Chimie du Solide, F, 59000, Lille, France
| | - Julien Trébosc
- Univ. Lille, CNRS, INRAE, Centrale Lille, Univ. Artois, FR 2638 - IMEC - Institut Michel-Eugène Chevreul, F, 59000, Lille, France
| | - Tomasz Pawlak
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363, Lodz, Poland
| | - Yusuke Nishiyama
- RIKEN-JEOL Collaboration Centre, RIKEN, Yokohama Campus, Yokohama, Kanagawa, 230-0045, Japan; JEOL RESONANCE Inc., Akishima, Tokyo, 196-8558, Japan
| | - Steven P Brown
- Department of Physics, University of Warwick, Coventry, CV4 7AL, UK.
| | - G N Manjunatha Reddy
- University of Lille, CNRS, Centrale Lille Institut, Univ. Artois, UMR 8181-UCCS- Unité de Catalyse et Chimie du Solide, F, 59000, Lille, France.
| |
Collapse
|
4
|
Duong NT, Nishiyama Y. Detection of remote proton-nitrogen correlations by 1H-detected 14N overtone solid-state NMR at fast MAS. Phys Chem Chem Phys 2022; 24:10717-10726. [PMID: 35315474 DOI: 10.1039/d2cp00155a] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Detecting proton and nitrogen correlations in solid-state nuclear magnetic resonance (NMR) is important for the structural determination of biological and chemical systems. Recent advances in proton detection-based approaches under fast magic-angle spinning have facilitated the detection of 1H-14N correlations by solid-state NMR. However, observing remote 1H-14N correlations by these approaches is still a challenge, especially for 14N sites having large quadrupolar couplings. To address this issue, we introduce the 1H-14N overtone continuous wave rotational-echo saturation-pulse double-resonance (1H-14N OT CW-RESPDOR) sequence. Unlike regular 2D correlation experiments where the indirect dimension is recorded in the time domain, the 1H-14N OT CW-RESPDOR experiment is directly observed in the frequency domain. A set of 1H-14N OT CW-RESPDOR filtered 1H spectra is recorded at varying 14N OT frequencies. Thanks to the selective nature of the 14N OT pulse, the filtered 1H spectra appear only if the 14N OT frequency hits the positions of the 14N OT central band or one of the spinning sidebands. This set of filtered 1H spectra represents a 2D 1H-14N OT correlation map. We have also investigated the optimizable parameters for CW-RESPDOR and figured out that these parameters are not strictly needed for our working magnetic field of 14.1 T. Hence, the experiment is easy to set up and requires almost no optimization. We have demonstrated the experimental feasibility of 1H-14N OT CW-RESPDOR on monoclinic L-histidine and L-alanyl L-alanine. The remote 1H-14N correlations have been efficiently detected, no matter how large the 14N quadrupolar interaction is, and agree with the crystal structures. In addition, based on the remote 1H-14N correlations from the non-protonated 14N site of L-histidine, we can unambiguously distinguish the orthorhombic and monoclinic forms.
Collapse
Affiliation(s)
- Nghia Tuan Duong
- Nano-Crystallography Unit, RIKEN-JEOL Collaboration Center, Yokohama, Kanagawa 230-0045, Japan.
| | - Yusuke Nishiyama
- Nano-Crystallography Unit, RIKEN-JEOL Collaboration Center, Yokohama, Kanagawa 230-0045, Japan. .,JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan
| |
Collapse
|
5
|
Liang L, Ji Y, Chen K, Gao P, Zhao Z, Hou G. Solid-State NMR Dipolar and Chemical Shift Anisotropy Recoupling Techniques for Structural and Dynamical Studies in Biological Systems. Chem Rev 2022; 122:9880-9942. [PMID: 35006680 DOI: 10.1021/acs.chemrev.1c00779] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
With the development of NMR methodology and technology during the past decades, solid-state NMR (ssNMR) has become a particularly important tool for investigating structure and dynamics at atomic scale in biological systems, where the recoupling techniques play pivotal roles in modern high-resolution MAS NMR. In this review, following a brief introduction on the basic theory of recoupling in ssNMR, we highlight the recent advances in dipolar and chemical shift anisotropy recoupling methods, as well as their applications in structural determination and dynamical characterization at multiple time scales (i.e., fast-, intermediate-, and slow-motion). The performances of these prevalent recoupling techniques are compared and discussed in multiple aspects, together with the representative applications in biomolecules. Given the recent emerging advances in NMR technology, new challenges for recoupling methodology development and potential opportunities for biological systems are also discussed.
Collapse
Affiliation(s)
- Lixin Liang
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yi Ji
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Kuizhi Chen
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| | - Pan Gao
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| | - Zhenchao Zhao
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| | - Guangjin Hou
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| |
Collapse
|
6
|
Duong NT, Gan Z, Nishiyama Y. Selective 1H- 14N Distance Measurements by 14N Overtone Solid-State NMR Spectroscopy at Fast MAS. Front Mol Biosci 2021; 8:645347. [PMID: 33898521 PMCID: PMC8061749 DOI: 10.3389/fmolb.2021.645347] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 01/28/2021] [Indexed: 01/25/2023] Open
Abstract
Accurate distance measurements between proton and nitrogen can provide detailed information on the structures and dynamics of various molecules. The combination of broadband phase-modulated (PM) pulse and rotational-echo saturation-pulse double-resonance (RESPDOR) sequence at fast magic-angle spinning (MAS) has enabled the measurement of multiple 1H-14N distances with high accuracy. However, complications may arise when applying this sequence to systems with multiple inequivalent 14N nuclei, especially a single 1H sitting close to multiple 14N atoms. Due to its broadband characteristics, the PM pulse saturates all 14N atoms; hence, the single 1H simultaneously experiences the RESPDOR effect from multiple 1H-14N couplings. Consequently, no reliable H-N distances are obtained. To overcome the problem, selective 14N saturation is desired, but it is difficult because 14N is an integer quadrupolar nucleus. Alternatively, 14N overtone (OT) NMR spectroscopy can be employed owing to its narrow bandwidth for selectivity. Moreover, owing to the sole presence of two energy levels (m = ± 1), the 14N OT spin dynamics behaves similarly to that of spin-1/2. This allows the interchangeability between RESPDOR and rotational-echo double-resonance (REDOR) since their principles are the same except the degree of 14N OT population transfer; saturation for the former whereas inversion for the latter. As the ideal saturation/inversion is impractical due to the slow and orientation-dependent effective nutation of 14N OT, the working condition is usually an intermediate between REDOR and RESPDOR. The degree of 14N OT population transfer can be determined from the results of protons with short distances to 14N and then can be used to obtain long-distance determination of other protons to the same 14N site. Herein, we combine the 14N OT and REDOR/RESPDOR to explore the feasibility of selective 1H-14N distance measurements. Experimental demonstrations on simple biological compounds of L-tyrosine.HCl, N-acetyl-L-alanine, and L-alanyl-L-alanine were performed at 14.1 T and MAS frequency of 62.5 kHz. The former two consist of a single 14N site, whereas the latter consists of two 14N sites. The experimental optimizations and reliable fittings by the universal curves are described. The extracted 1H-14N distances by OT-REDOR are in good agreement with those determined by PM-RESPDOR and diffraction techniques.
Collapse
Affiliation(s)
- Nghia Tuan Duong
- NMR Science and Development Division, RIKEN SPring-8 Center, Nano-Crystallography Unit, RIKEN-JEOL Collaboration Center, Yokohama, Japan
| | - Zhehong Gan
- Centre of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, FL, United States
| | - Yusuke Nishiyama
- NMR Science and Development Division, RIKEN SPring-8 Center, Nano-Crystallography Unit, RIKEN-JEOL Collaboration Center, Yokohama, Japan
- JEOL RESONANCE Inc., Tokyo, Japan
| |
Collapse
|
7
|
Concistré M, Paul S, Carravetta M, Kuprov I, Williamson PTF. Strategies for 1 H-Detected Dynamic Nuclear Polarization Magic-Angle Spinning NMR Spectroscopy. Chemistry 2020; 26:15852-15854. [PMID: 32827182 PMCID: PMC7756879 DOI: 10.1002/chem.202003463] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Indexed: 11/09/2022]
Abstract
Combining dynamic nuclear polarization with proton detection significantly enhances the sensitivity of magic-angle spinning NMR spectroscopy. Herein, the feasibility of proton-detected experiments with slow (10 kHz) magic angle spinning was demonstrated. The improvement in sensitivity permits the acquisition of indirectly detected 14 N NMR spectra allowing biomolecular structures to be characterized without recourse to isotope labelling. This provides a new tool for the structural characterization of environmental and medical samples, in which isotope labelling is frequently intractable.
Collapse
Affiliation(s)
- Maria Concistré
- School of ChemistryUniversity of SouthamptonSouthamptonSO171BJUK
| | - Subhradip Paul
- Sir Peter Mansfield Imaging CentreUniversity of NottinghamNottinghamUK
| | | | - Ilya Kuprov
- School of ChemistryUniversity of SouthamptonSouthamptonSO171BJUK
| | | |
Collapse
|
8
|
Corlett EK, Blade H, Hughes LP, Sidebottom PJ, Walker D, Walton RI, Brown SP. 5-amino-2-methylpyridinium hydrogen fumarate: An XRD and NMR crystallography analysis. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2020; 58:1026-1035. [PMID: 32187751 DOI: 10.1002/mrc.5021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 03/04/2020] [Accepted: 03/14/2020] [Indexed: 06/10/2023]
Abstract
Single-crystal X-ray diffraction structures of the 5-amino-2-methylpyridinium hydrogen fumarate salt have been solved at 150 and 300 K (CCDC 1952142 and 1952143). A base-acid-base-acid ring is formed through pyridinium-carboxylate and amine-carboxylate hydrogen bonds that hold together chains formed from hydrogen-bonded hydrogen fumarate ions. 1 H and 13 C chemical shifts as well as 14 N shifts that additionally depend on the quadrupolar interaction are determined by experimental magic angle spinning (MAS) solid-state nuclear magnetic resonance (NMR) and gauge-including projector-augmented wave (GIPAW) calculation. Two-dimensional homonuclear 1 H-1 H double-quantum (DQ) MAS and heteronuclear 1 H-13 C and 14 N-1 H spectra are presented. Only small differences of up to 0.1 and 0.6 ppm for 1 H and 13 C are observed between GIPAW calculations starting with the two structures solved at 150 and 300 K (after geometry optimisation of atomic positions, but not unit cell parameters). A comparison of GIPAW-calculated 1 H chemical shifts for isolated molecules and the full crystal structures is indicative of hydrogen bonding strength.
Collapse
Affiliation(s)
| | - Helen Blade
- Pharmaceutical Development, AstraZeneca, Macclesfield, UK
| | | | | | - David Walker
- Department of Physics, University of Warwick, Coventry, UK
| | | | - Steven P Brown
- Department of Physics, University of Warwick, Coventry, UK
| |
Collapse
|
9
|
Sajith SV, Jayanthi S, Lupulescu A. Effective Hamiltonian and 1H- 14N cross polarization/double cross polarization at fast MAS. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2020; 320:106832. [PMID: 33011464 DOI: 10.1016/j.jmr.2020.106832] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 09/15/2020] [Accepted: 09/18/2020] [Indexed: 06/11/2023]
Abstract
In this work we investigate in detail the underlying spin-dynamics associated with 1H-14N double CP experiments under fast MAS, recently demonstrated by Carnevale et al. We employ matrix logarithm and Floquet theory to compute numerically the effective Hamiltonian associated to the time-dependent problem. Certain common features related to construction of effective Hamiltonians by both approaches are discussed. The main observations related to 1H-14N CPMAS/double CP transfer are: (a) various spin terms of the effective Hamiltonian strongly depend on the crystallite orientation; (b) significant CP transfer occurs only when the magnitudes of the effective1H and 14N RF strengths are comparable, and simultaneously all pure 14N terms in the effective Hamiltonian are small, except for the longitudinal and the RF terms; (c) the sign of 14N CPMAS signal follows the sign of 14N effective RF strength; (d) sign of the double CP signal is largely independent of crystallite orientation. We predict and verify matching conditions employing multiples of the spinning frequency or involving different 14N RF strengths. We provide an analytical proof for (d). The proof also provides an estimate for the ratio of 1H-14N and 14N-1H transfer amplitudes which is further substantiated through simulations. In addition, we find that double CP signals include contributions from several single-quantum coherences present after the first CP process. The uneven contribution from different coherences leads to a reversal of signal at very short contact times, a feature noted experimentally by Carnevale et al. The connection between CPMAS transfer and efficient spin-lock is discussed and illustrated. The factors affecting second-order quadrupolar lineshapes in double CP experiment are examined. With a linear ramp of 1H RF amplitude we have observed that significant CP transfer occurs for more crystallite orientations resulting in improved sensitivity.
Collapse
Affiliation(s)
- Sadasivan V Sajith
- Department of Physics, Indian Institute of Space Science and Technology, Valiamala, Thiruvananthapuram 695 547, Kerala, India
| | - Sundaresan Jayanthi
- Department of Physics, Indian Institute of Space Science and Technology, Valiamala, Thiruvananthapuram 695 547, Kerala, India.
| | | |
Collapse
|
10
|
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.
Collapse
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.
| |
Collapse
|
11
|
Grüne M, Luxenhofer R, Iuga D, Brown SP, Pöppler AC. 14N–1H HMQC solid-state NMR as a powerful tool to study amorphous formulations – an exemplary study of paclitaxel loaded polymer micelles. J Mater Chem B 2020; 8:6827-6836. [DOI: 10.1039/d0tb00614a] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
14N–1H HMQC experiments are powerful experiments to characterize amorphous drug–polymer formulations of paclitaxel yielding well-separated signals in the 14N dimension as well as information on the symmetry of 14N and 14N–1H interactions.
Collapse
Affiliation(s)
- Marvin Grüne
- Institute of Organic Chemistry
- University of Würzburg
- 97074 Würzburg
- Germany
| | - Robert Luxenhofer
- Lehrstuhl für Chemische Technologie der Materialsynthese
- University of Würzburg
- 97070 Würzburg
- Germany
| | - Dinu Iuga
- Department of Physics
- University of Warwick
- Coventry
- UK
| | | | | |
Collapse
|
12
|
Hung I, Gor'kov P, Gan Z. Efficient and sideband-free 1H-detected 14N magic-angle spinning NMR. J Chem Phys 2019; 151:154202. [PMID: 31640368 DOI: 10.1063/1.5126599] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Indirect detection via sensitive spin-1/2 nuclei like protons under magic-angle spinning (MAS) has been developed to overcome the low spectral sensitivity and resolution of 14N NMR. The 14N quadrupolar couplings cause inefficient encoding of the 14N frequency due to large frequency offsets and make the rotor-synchronization of the evolution time necessary. It is shown that 14N rf pulses longer than the rotor period can efficiently encode 14N frequencies and generate spinning sideband free spectra along the indirect dimension. Average Hamiltonian and Floquet theories in the quadrupolar jolting frame (QJF) are used to treat the spin dynamics of the spin-1 quadrupolar nucleus under long 14N rf pulses and MAS. The results show that the rf action can be described by a scaled and phase-shifted effective rf field. The large quadrupolar frequency offset becomes absent in the QJF and therefore leads to sideband-free spectra along the indirect dimension. More importantly, when a pair of long 14N rf pulses are used, the distribution of the phase shift of the effective rf field does not affect the 14N encoding for powder samples; thus, high efficiencies can be obtained. The efficient and sideband-free features are demonstrated for three 1H/14N indirectly detected experiments using long 14N pulses under fast MAS.
Collapse
Affiliation(s)
- Ivan Hung
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
| | - Peter Gor'kov
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
| | - Zhehong Gan
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
| |
Collapse
|
13
|
Rankin AGM, Trébosc J, Paluch P, Lafon O, Amoureux JP. Evaluation of excitation schemes for indirect detection of 14N via solid-state HMQC NMR experiments. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2019; 303:28-41. [PMID: 30999136 DOI: 10.1016/j.jmr.2019.04.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 04/03/2019] [Accepted: 04/04/2019] [Indexed: 06/09/2023]
Abstract
It has previously been shown that 14N NMR spectra can be reliably obtained through indirect detection via HMQC experiments. This method exploits the transfer of coherence between single-(SQ) or double-quantum (DQ) 14N coherences, and SQ coherences of a suitable spin-1/2 'spy' nucleus, e.g., 1H. It must be noted that SQ-SQ methods require a carefully optimized setup to minimize the broadening related to the first-order quadrupole interaction (i.e., an extremely well-adjusted magic angle and a highly stable spinning speed), whereas DQ-SQ ones do not. In this work, the efficiencies of four 14N excitation schemes (DANTE, XiX, Hard Pulse (HP), and Selective Long Pulse (SLP)) are compared using J-HMQC based numerical simulations and either SQ-SQ or DQ-SQ 1H-{14N} D-HMQC experiments on l-histidine HCl and N-acetyl-l-valine at 18.8 T and 62.5 kHz MAS. The results demonstrate that both DANTE and SLP provide a more efficient 14N excitation profile than XiX and HP. Furthermore, it is shown that the SLP scheme: (i) is efficient over a large range of quadrupole interaction, (ii) is highly robust to offset and rf-pulse length and amplitude, and (iii) is very simple to set up. These factors make SLP ideally suited to widespread, non-specialist use in solid-state NMR analyses of nitrogen-containing materials.
Collapse
Affiliation(s)
- Andrew G M Rankin
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181 - UCCS - Unit of Catalysis and Chemistry of Solids, F-59000 Lille, France.
| | - Julien Trébosc
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181 - UCCS - Unit of Catalysis and Chemistry of Solids, F-59000 Lille, France; Univ. Lille, CNRS-FR2638, Fédération Chevreul, F-59000 Lille, France
| | - Piotr Paluch
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181 - UCCS - Unit of Catalysis and Chemistry of Solids, F-59000 Lille, France; Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, PL-90363 Lodz, Poland
| | - Olivier Lafon
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181 - UCCS - Unit of Catalysis and Chemistry of Solids, F-59000 Lille, France; Institut Universitaire de France, 1 rue Descartes, F-75231 Paris Cedex 05, France
| | - Jean-Paul Amoureux
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181 - UCCS - Unit of Catalysis and Chemistry of Solids, F-59000 Lille, France; Bruker Biospin, 34 rue de l'industrie, F-67166 Wissembourg, France.
| |
Collapse
|
14
|
Perras FA, Goh TW, Wang LL, Huang W, Pruski M. Enhanced 1H-X D-HMQC performance through improved 1H homonuclear decoupling. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2019; 98:12-18. [PMID: 30669006 DOI: 10.1016/j.ssnmr.2019.01.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 01/05/2019] [Accepted: 01/06/2019] [Indexed: 06/09/2023]
Abstract
The sensitivity of solid-state NMR experiments that utilize 1H zero-quantum heteronuclear dipolar recoupling, such as D-HMQC, is compromised by poor homonuclear decoupling. This leads to a rapid decay of recoupled magnetization and an inefficient recoupling of long-range dipolar interactions, especially for nuclides with low gyromagnetic ratios. We investigated the use, in symmetry-based 1H heteronuclear recoupling sequences, of a basic R element that was principally designed for efficient homonuclear decoupling. By shortening the time required to suppress the effects of homonuclear dipolar interactions to the duration of a single inversion pulse, spin diffusion was effectively quenched and long-lived recoupled coherence lifetimes could be obtained. We show, both theoretically and experimentally, that these modified sequences can yield considerable sensitivity improvements over the current state-of-the-art methods and applied them to the indirect detection of 89Y in a metal-organic framework.
Collapse
Affiliation(s)
| | - Tian Wei Goh
- US Department of Energy, Ames Laboratory, Ames, IA, 50011, USA; Department of Chemistry, Iowa State University, Ames, IA, 50011, USA
| | - Lin-Lin Wang
- US Department of Energy, Ames Laboratory, Ames, IA, 50011, USA
| | - Wenyu Huang
- US Department of Energy, Ames Laboratory, Ames, IA, 50011, USA; Department of Chemistry, Iowa State University, Ames, IA, 50011, USA
| | - Marek Pruski
- US Department of Energy, Ames Laboratory, Ames, IA, 50011, USA; Department of Chemistry, Iowa State University, Ames, IA, 50011, USA.
| |
Collapse
|
15
|
Pandey MK, Damron JT, Ramamoorthy A, Nishiyama Y. Proton-detected 3D 1H anisotropic/ 14N/ 1H isotropic chemical shifts correlation NMR under fast magic angle spinning on solid samples without isotopic enrichment. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2019; 97:40-45. [PMID: 30623800 DOI: 10.1016/j.ssnmr.2018.12.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 12/25/2018] [Accepted: 12/26/2018] [Indexed: 06/09/2023]
Abstract
The chemical shift anisotropy (CSA) interaction of a nucleus is an important indicator of the local electronic environment particularly for the contributions arising from hydrogen (H)-bonding, electrostatic and π-π interactions. CSAs of protons bonded to nitrogen atoms are of significant interest due to their common role as H-bonding partners in many chemical, pharmaceutical and biological systems. Although very fast (∼100 kHz) magic angle sample spinning (MAS) experiments have enabled the measurement of proton CSAs directly from solids, due to a narrow chemical shift (CS) distribution, overlapping NH proton resonances are common and necessitate the introduction of an additional frequency dimension to the regular 2D 1H CSA/1H CS correlation method to achieve sufficient resolution. While this can be accomplished by using the isotropic shift frequency of 14N or 15N nuclei, the use of the naturally-abundant 14N nucleus avoids 15N isotopic labeling and therefore would be useful for a variety of solids. To this end, we propose a proton-detected 3D 1H CSA/14N/1H CS correlation method under fast MAS (90 kHz) to determine the CSA tensors of NH protons in samples without isotopic enrichment. Our experimental results demonstrate that the proposed 3D NMR experiment is capable of resolving the overlapping 1H resonances of amide (NH) groups through the 14N isotropic shift frequency dimension and enables the accurate measurement of site-specific 1H CSAs directly from powder samples under fast MAS conditions. In addition to the 3D 1H CSA/14N/1H CS experiment, an approach employing 14N-edited 2D 1H CSA/1H CS experiment is also demonstrated as an additional means to address spectral overlap of NH resonances with aliphatic and other proton resonances in solids.
Collapse
Affiliation(s)
- Manoj Kumar Pandey
- Indian Institute of Technology Ropar, Nangal Road, Rupnagar, 140001, Punjab, India.
| | - Joshua T Damron
- Department of Chemistry, University of Michigan, 930 N. University Ave., Ann Arbor, MI, 48109-1055, USA
| | - Ayyalusamy Ramamoorthy
- Department of Chemistry, University of Michigan, 930 N. University Ave., Ann Arbor, MI, 48109-1055, USA; Biophysics Program, University of Michigan, 930 N. University Ave., Ann Arbor, MI, 48109, USA
| | - Yusuke Nishiyama
- RIKEN-JEOL Collaboration Center, RIKEN, Yokohama, Kanagawa, 230-0045, Japan; JEOL RESONANCE Inc., Musashino, Akishima, Tokyo, 196-8558, Japan.
| |
Collapse
|
16
|
Concistré M, Kuprov I, Haies IM, Williamson PT, Carravetta M. 14N overtone NMR under MAS: Signal enhancement using cross-polarization methods. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2019; 298:1-5. [PMID: 30481605 DOI: 10.1016/j.jmr.2018.10.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 10/28/2018] [Accepted: 10/31/2018] [Indexed: 06/09/2023]
Abstract
Polarization transfer methods are widely adopted for the purpose of correlating different nuclear species as well as to achieve signal enhancement. Polarization transfer from 1H to the 14N overtone transition (Δm = 2) can be achieved using cross polarization methods under magic-angle spinning conditions, where spin locks of the order of several milliseconds can be obtained on common bio-solids (α-glycine and N-acetylvaline). Signal enhancement factors up to 4.4 per scan, can be achieved under favorable conditions, despite MHz-sized quadrupolar interaction. Moreover, we present a detailed theoretical treatment and accurate numerical simulations which are in excellent agreement the unusual experimental matching conditions observed for cross-polarization to 14N overtone.
Collapse
Affiliation(s)
- Maria Concistré
- School of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, United Kingdom
| | - Ilya Kuprov
- School of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, United Kingdom
| | - Ibraheem M Haies
- University of Mosul, College of Science, Department of Chemistry, Iraq
| | - Philip T Williamson
- Centre for Biological Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - Marina Carravetta
- School of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, United Kingdom.
| |
Collapse
|
17
|
Corlett EK, Blade H, Hughes LP, Sidebottom PJ, Walker D, Walton RI, Brown SP. An XRD and NMR crystallographic investigation of the structure of 2,6-lutidinium hydrogen fumarate. CrystEngComm 2019. [DOI: 10.1039/c9ce00633h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A crystallographic study highlighting the benefits of a combined XRD and NMR approach in investigating both stability and variation within an organic multicomponent crystal.
Collapse
Affiliation(s)
| | - Helen Blade
- Pharmaceutical Development
- AstraZeneca
- Macclesfield
- UK
| | | | | | - David Walker
- Department of Physics
- University of Warwick
- Coventry
- UK
| | | | | |
Collapse
|
18
|
|
19
|
Pandey MK, Nishiyama Y. A one-dimensional solid-state NMR approach for 14NH/ 14NH overtone correlation through 1H/ 1H mixing under fast MAS. Phys Chem Chem Phys 2018; 20:25849-25853. [PMID: 30288509 DOI: 10.1039/c8cp05000g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Homonuclear correlations are key to structural studies using solid-state NMR. In this contribution, using 14N overtone transition (OT) as a selective excitation approach, we propose a proton-detected one-dimensional (1D) 14NOT/14NOT/1H correlation solid-state NMR method mediated through 1H/1H mixing at fast magic angle spinning to achieve NH/NH proximities in naturally abundant samples. The proposed method is time efficient by a factor of ∼7.5 in comparison to the existing fundamental 14N frequency-based three-dimensional (3D) 14N/14N/1H correlation method.
Collapse
Affiliation(s)
- Manoj Kumar Pandey
- Indian Institute of Technology (IIT) Ropar, Nangal Road, Rupnagar 140001, Punjab, India.
| | | |
Collapse
|
20
|
Ashbrook SE, Griffin JM, Johnston KE. Recent Advances in Solid-State Nuclear Magnetic Resonance Spectroscopy. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2018; 11:485-508. [PMID: 29324182 DOI: 10.1146/annurev-anchem-061417-125852] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The sensitivity of nuclear magnetic resonance (NMR) spectroscopy to the local atomic-scale environment offers great potential for the characterization of a diverse range of solid materials. Despite offering more information than its solution-state counterpart, solid-state NMR has not yet achieved a similar level of recognition, owing to the anisotropic interactions that broaden the spectral lines and hinder the extraction of structural information. Here, we describe the methods available to improve the resolution of solid-state NMR spectra and the continuing research in this area. We also highlight areas of exciting new and future development, including recent interest in combining experiment with theoretical calculations, the rise of a range of polarization transfer techniques that provide significant sensitivity enhancements, and the progress of in situ measurements. We demonstrate the detailed information available when studying dynamic and disordered solids and discuss the future applications of solid-state NMR spectroscopy across the chemical sciences.
Collapse
Affiliation(s)
- Sharon E Ashbrook
- School of Chemistry, EaStCHEM and Centre of Magnetic Resonance, University of St. Andrews, St. Andrews KY16 9ST, United Kingdom;
| | - John M Griffin
- Department of Chemistry and Materials Science Institute, Lancaster University, Lancaster LA1 4YB, United Kingdom
| | - Karen E Johnston
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, United Kingdom
| |
Collapse
|
21
|
Carnevale D, Ji X, Bodenhausen G. Double cross polarization for the indirect detection of nitrogen-14 nuclei in magic angle spinning NMR spectroscopy. J Chem Phys 2018; 147:184201. [PMID: 29141439 DOI: 10.1063/1.5000689] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Nitrogen-14 NMR spectra at fast magic-angle spinning rates can be acquired indirectly by means of two-dimensional techniques based on double cross polarization transfer 1H → 14N →1H. Experimental evidence is given for polycrystalline samples of glycine, l-histidine, and the dipeptide Ala-Gly. Either one-bond or long-range correlations can be favored by choosing the length of the cross polarization contact pulses. Longer contact pulses allow the detection of unprotonated nitrogen sites. In contrast to earlier methods that exploited second-order quadrupolar/dipolar cross-terms, cross polarization operates in the manner of the method of Hartmann and Hahn, even for 14N quadrupolar couplings up to 4 MHz. Simulations explain why amorphous samples tend to give rise to featureless spectra because the 14N quadrupolar interactions may vary dramatically with the lattice environment. The experiments are straightforward to set up and are shown to be effective for different nitrogen environments and robust with respect to the rf-field strengths and to the 14N carrier frequency during cross polarization. The efficiency of indirect detection of 14N nuclei by double cross polarization is shown to be similar to that of isotopically enriched 13C nuclei.
Collapse
Affiliation(s)
- Diego Carnevale
- Departement de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Université Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
| | - Xiao Ji
- Departement de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Université Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
| | - Geoffrey Bodenhausen
- Departement de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Université Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
| |
Collapse
|
22
|
Pandey MK, Amoureux JP, Asakura T, Nishiyama Y. Sensitivity enhanced (14)N/(14)N correlations to probe inter-beta-sheet interactions using fast magic angle spinning solid-state NMR in biological solids. Phys Chem Chem Phys 2018; 18:22583-9. [PMID: 27477057 DOI: 10.1039/c6cp03848d] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
(14)N/(14)N correlations are vital for structural studies of solid samples, especially those in which (15)N isotopic enrichment is challenging, time-consuming and expensive. Although (14)N nuclei have high isotopic abundance (99.6%), there are inherent difficulties in observing (14)N/(14)N correlations due to limited resolution and sensitivity related to: (i) low (14)N gyromagnetic ratio (γ), (ii) large (14)N quadrupolar couplings, (iii) integer (14)N spin quantum number (I = 1), and (iv) very weak (14)N-(14)N dipolar couplings. Previously, we demonstrated a proton-detected 3D (14)N/(14)N/(1)H correlation experiment at fast magic angle spinning (MAS) on l-histidine·HCl·H2O utilizing a through-bond (J) and residual dipolar-splitting (RDS) based heteronuclear multiple quantum correlation (J-HMQC) sequence mediated through (1)H/(1)H radio-frequency driven recoupling (RFDR). As an extension of our previous work, in this study we show the utility of dipolar-based HMQC (D-HMQC) in combination with (1)H/(1)H RFDR mixing to obtain sensitivity enhanced (14)N/(14)N correlations in more complex biological solids such as a glycyl-l-alanine (Gly-l-Ala) dipeptide, and parallel (P) and antiparallel (AP) β-strand alanine tripeptides (P-(Ala)3 and AP-(Ala)3, respectively). These systems highlight the mandatory necessity of 3D (14)N/(14)N/(1)H measurements to get (14)N/(14)N correlations when the amide proton resonances are overlapped. Moreover, the application of long selective (14)N pulses, instead of short hard ones, is shown to improve the sensitivity. Globally, we demonstrate that replacing J-scalar with dipolar interaction and hard- with selective-(14)N pulses allows gaining a factor of ca. 360 in experimental time. On the basis of intermolecular NH/NH distances and (14)N quadrupolar tensor orientations, (14)N/(14)N correlations are effectively utilized to make a clear distinction between the parallel and antiparallel arrangements of the β-strands in (Ala)3 through the observation of inter-β-sheet correlations.
Collapse
Affiliation(s)
- Manoj Kumar Pandey
- RIKEN CLST-JEOL Collaboration Center, RIKEN, Yokohama, Kanagawa 230-0045, Japan. and JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan
| | - Jean-Paul Amoureux
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, Shanghai, 200062, China and UCCS (CNRS-8181), Lille University, Lille 59650, France
| | - Tetsuo Asakura
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Yusuke Nishiyama
- RIKEN CLST-JEOL Collaboration Center, RIKEN, Yokohama, Kanagawa 230-0045, Japan. and JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan
| |
Collapse
|
23
|
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.
Collapse
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
| |
Collapse
|
24
|
Duong NT, Nishiyama Y. Satellite and central transitions selective 1H/{ 27Al} D-HMQC experiments at very fast MAS for quadrupolar couplings determination. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 84:83-88. [PMID: 28089491 DOI: 10.1016/j.ssnmr.2016.12.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 12/20/2016] [Accepted: 12/29/2016] [Indexed: 06/06/2023]
Abstract
Recent study has demonstrated the application of the proton-detected heteronuclear multi-quantum coherence (HMQC) at ultrafast Magic Angle Spinning (MAS) to probe quadrupolar nuclei including 14N and 35Cl. In addition, for half-integer quadrupolar nucleus like 35Cl, the quadrupolar product can be calculated based on the shift difference between the center band of satellite transition (ST) and the central transition (CT) peaks. The applicability of this technique is further investigated on spin I=5/2, namely 27Al nucleus, and kaolin is chosen as the testing sample. However this study is not straightforward owing to a spin quantum number I=5/2 of 27Al nucleus and a small quadrupolar coupling of kaolin. Furthermore, very fast MAS, which is mandatory for proton-detected experiment to suppress 1H-1H homonuclear dipolar interactions, introduces additional complexities. It induces the partial overlap of CT and the center band of inner ST (ST1) resonance in addition to the insufficiency of CT-selective excitation by soft-pulse irradiation. In the current work, we employ the constant-time D-HMQC experiment, in which the duration between two recoupling blocks is fixed to a constant value and the arbitrary t1 increment can be used within this duration. This constant-time D-HMQC enables the precise determination of CT and ST resonance shifts through CT- and ST-selective observations by the indirect spectral width (i) with asynchronized sampling to the top of rotational-echoes for STs and (ii) three times larger than the spinning frequency, respectively. We also numerically and experimentally develop a satellite-selective excitation technique, in which the radio frequency field is applied to the first spinning sideband of ST1 resonance. The satellite-selective 1D single pulse and 2D conventional D-HMQC experiments are demonstrated. The quadrupolar product of 27Al nucleus extracted from the resulting spectra is in good agreement with the literature.
Collapse
Affiliation(s)
- Nghia Tuan Duong
- RIKEN CLST-JEOL collaboration center, RIKEN, Yokohama, Kanagawa 230-0045, Japan
| | - Yusuke Nishiyama
- RIKEN CLST-JEOL collaboration center, RIKEN, Yokohama, Kanagawa 230-0045, Japan; JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan.
| |
Collapse
|
25
|
Veinberg SL, Lindquist AW, Jaroszewicz MJ, Schurko RW. Practical considerations for the acquisition of ultra-wideline 14N NMR spectra. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 84:45-58. [PMID: 28130009 DOI: 10.1016/j.ssnmr.2016.12.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 12/20/2016] [Accepted: 12/20/2016] [Indexed: 06/06/2023]
Abstract
Several considerations for the acquisition, processing, and analysis of high quality ultra-wideline (UW) 14N solid-state NMR (SSNMR) powder patterns under static conditions are discussed. It is shown that the 14N quadrupolar parameters may be determined accurately using the frequencies of only two discontinuities in 14N NMR powder patterns that are dominated by the first-order quadrupolar interaction, thereby eliminating the need for the acquisition of the entire pattern and concomitantly reducing experimental time. A framework for utilizing the WURST-CPMG pulse sequence to improve the efficiency of UW 14N SSNMR experiments is explored in two parts: (i) a systematic investigation of the design and parameterization of the WURST pulse is presented, and (ii) the development of the practical aspects of CPMG refocusing for the acquisition of UW 14N SSNMR powder patterns is discussed, with a focus on maximizing both signal-to-noise and resolution, and minimizing spectral distortions. Finally, a strategy is demonstrated that allows for the measurement of the 14N quadrupolar parameters for any nitrogen moiety whose quadrupolar coupling constant falls within the range 0.8≤|CQ|≤1.5MHz, by acquiring only two 14N NMR sub-spectra at strategically located transmitter frequencies; these results are compared to full powder patterns which are acquired using frequency-stepped methods. The methodologies and practical considerations outlined herein are not only useful for the rapid acquisition of UW 14N NMR spectra, but may also be modified and applied for UW NMR of a plethora of quadrupolar and spin-1/2 nuclides.
Collapse
Affiliation(s)
- Stanislav L Veinberg
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4
| | - Austin W Lindquist
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4
| | - Michael J Jaroszewicz
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4
| | - Robert W Schurko
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4.
| |
Collapse
|
26
|
Brinkmann A, O'Dell LA. Optimisation of excitation schemes for 14N overtone MAS NMR using numerically exact simulations. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 84:34-40. [PMID: 27986400 DOI: 10.1016/j.ssnmr.2016.12.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 12/08/2016] [Accepted: 12/08/2016] [Indexed: 06/06/2023]
Abstract
Numerically exact simulations of the 14N overtone (14NOT) MAS NMR experiment are used to investigate the effects of the applied magnetic field strength as well as three types of excitation pulse. The results show that both the resolution and sensitivity of 14NOT MAS NMR increase linearly with the applied static magnetic field strength. Standard RF excitation pulses are compared with frequency-swept WURST pulses as well as several composite pulses. WURST pulses are demonstrated to provide the largest bandwidths, while the direction of the frequency sweep is shown to be important when these pulses are used for the direct observation of 14NOT signals. A composite pulse is shown to provide the most efficient excitation overall, but only when applied on resonance. WURST excitation pulses are therefore the best option when studying a sample with unknown 14N NMR parameters.
Collapse
Affiliation(s)
- Andreas Brinkmann
- Measurement Science and Standards, National Research Council Canada, 1200 Montreal Road, M40, Ottawa, Ontario, Canada K1A 0R6
| | - Luke A O'Dell
- Institute for Frontier Materials, Deakin University, Waurn Ponds Campus, Geelong, Victoria 3220, Australia.
| |
Collapse
|
27
|
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]
|
28
|
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
| | | |
Collapse
|
29
|
Veinberg SL, Friedl ZW, Lindquist AW, Kispal B, Harris KJ, O'Dell LA, Schurko RW. 14N Solid-State NMR Spectroscopy of Amino Acids. Chemphyschem 2016; 17:4011-4027. [DOI: 10.1002/cphc.201600873] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 09/12/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Stanislav L. Veinberg
- Department of Chemistry and Biochemistry; University of Windsor; 401 Sunset Avenue Windsor Ontario N9B 3P4 Canada
| | - Zachary W. Friedl
- Department of Chemistry and Biochemistry; University of Windsor; 401 Sunset Avenue Windsor Ontario N9B 3P4 Canada
| | - Austin W. Lindquist
- Department of Chemistry and Biochemistry; University of Windsor; 401 Sunset Avenue Windsor Ontario N9B 3P4 Canada
| | - Brianna Kispal
- Department of Chemistry and Biochemistry; University of Windsor; 401 Sunset Avenue Windsor Ontario N9B 3P4 Canada
| | - Kristopher J. Harris
- Department of Chemistry and Biochemistry; University of Windsor; 401 Sunset Avenue Windsor Ontario N9B 3P4 Canada
| | - Luke A. O'Dell
- Institute for Frontier Materials; Deakin University; Waurn Ponds Campus Geelong Victoria 3220 Australia
| | - Robert W. Schurko
- Department of Chemistry and Biochemistry; University of Windsor; 401 Sunset Avenue Windsor Ontario N9B 3P4 Canada
| |
Collapse
|
30
|
Gregorovič A, Apih T, Seliger J. (1)H-(14)N cross-relaxation spectrum analysis in sildenafil and sildenafil citrate. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2016; 78:16-23. [PMID: 27379753 DOI: 10.1016/j.ssnmr.2016.05.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Revised: 03/24/2016] [Accepted: 05/19/2016] [Indexed: 06/06/2023]
Abstract
Here we describe a method for the extraction of (14)N quadrupole parameters from a (1)H-(14)N cross-relaxation spectrum by fitting the lineshapes of the (14)N quadrupole transitions. The procedures used typically to fit quadrupole lineshapes are not directly applicable to fit the (1)H-(14)N cross-relaxation spectrum, because the presence of proton homonuclear dipolar interaction broadens the lineshapes considerably and prevents a reliable determination of Cq and η from a single lineshape. Instead, one must fit two or even three lineshapes originating from the same nitrogen site simultaneously. The problem is to identify which lineshapes belong together when many are observed due to the existence of several nitrogen sites. We solve this problem by fitting the spectrum for all possible combinations and find the best-fitting one. This combination then most likely correctly identifies lineshapes belonging to the same nitrogen site. There are two main advantages of our method compared to the typically used method, which relies only on lineshape singularities: (i) the method is "automatic" and does not require knowledge of nitrogen quadrupole parameters in similar environments to aid dip pairing and (ii) the accuracy of quadrupole parameters is better, as proton linewidth is included in the fits. We use sildenafil and sildenafil citrate as model compounds, each with six non-equivalent nitrogen sites.
Collapse
Affiliation(s)
- Alan Gregorovič
- Institute "Jožef Stefan", Jamova 39, 1000 Ljubljana, Slovenia.
| | - Tomaž Apih
- Institute "Jožef Stefan", Jamova 39, 1000 Ljubljana, Slovenia
| | - Janez Seliger
- Institute "Jožef Stefan", Jamova 39, 1000 Ljubljana, Slovenia; Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
| |
Collapse
|
31
|
Lovchinsky I, Sushkov AO, Urbach E, de Leon NP, Choi S, De Greve K, Evans R, Gertner R, Bersin E, Müller C, McGuinness L, Jelezko F, Walsworth RL, Park H, Lukin MD. Nuclear magnetic resonance detection and spectroscopy of single proteins using quantum logic. Science 2016; 351:836-41. [DOI: 10.1126/science.aad8022] [Citation(s) in RCA: 301] [Impact Index Per Article: 37.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Accepted: 01/21/2016] [Indexed: 02/05/2023]
Affiliation(s)
- I. Lovchinsky
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
| | - A. O. Sushkov
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
| | - E. Urbach
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
| | - N. P. de Leon
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
| | - S. Choi
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
| | - K. De Greve
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
| | - R. Evans
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
| | - R. Gertner
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
| | - E. Bersin
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
| | - C. Müller
- Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQST), Ulm University, D-89081, Ulm, Germany
| | - L. McGuinness
- Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQST), Ulm University, D-89081, Ulm, Germany
| | - F. Jelezko
- Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQST), Ulm University, D-89081, Ulm, Germany
| | - R. L. Walsworth
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
- Center for Brain Science, Harvard University, Cambridge, MA 02138, USA
| | - H. Park
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
- Center for Brain Science, Harvard University, Cambridge, MA 02138, USA
- Broad Institute of MIT and Harvard, 7 Cambridge Center, Cambridge, MA 02142, USA
| | - M. D. Lukin
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
| |
Collapse
|
32
|
Haies IM, Jarvis JA, Bentley H, Heinmaa I, Kuprov I, Williamson PTF, Carravetta M. (14)N overtone NMR under MAS: signal enhancement using symmetry-based sequences and novel simulation strategies. Phys Chem Chem Phys 2016; 17:6577-87. [PMID: 25662410 PMCID: PMC4673505 DOI: 10.1039/c4cp03994g] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Overtone 14N NMR spectroscopy is a promising route for the direct detection of 14N signals with good spectral resolution.
Overtone 14N NMR spectroscopy is a promising route for the direct detection of 14N signals with good spectral resolution. Its application is currently limited, however, by the absence of efficient polarization techniques for overtone signal enhancement and the lack of efficient numerical simulation techniques to aid in both the development of new methods and the analysis and interpretation of experimental data. In this paper we report a novel method for the transfer of polarization from 1H to the 14N overtone using symmetry-based R-sequences that overcome many of the limitations of adiabatic approaches that have worked successfully on static samples. Refinement of these sequences and the analysis of the resulting spectra have been facilitated through the development of an efficient simulation strategy for 14N overtone NMR spectroscopy of spinning samples, using effective Hamiltonians on top of Floquet and Fokker–Planck equations.
Collapse
Affiliation(s)
- Ibraheem M Haies
- School of Chemistry, University of Southampton, SO17 1BJ, Southampton, UK.
| | | | | | | | | | | | | |
Collapse
|
33
|
Veinberg SL, Johnston KE, Jaroszewicz MJ, Kispal BM, Mireault CR, Kobayashi T, Pruski M, Schurko RW. Natural abundance 14N and 15N solid-state NMR of pharmaceuticals and their polymorphs. Phys Chem Chem Phys 2016; 18:17713-30. [DOI: 10.1039/c6cp02855a] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
14N and 15N solid-state NMR at natural abundance are used in tandem for the investigation of pharmaceuticals and their polymorphs.
Collapse
Affiliation(s)
| | | | | | - Brianna M. Kispal
- Department of Chemistry and Biochemistry
- University of Windsor
- Windsor
- Canada
| | | | | | - Marek Pruski
- U.S. DOE Ames Laboratory
- Iowa State University
- Ames
- USA
- Department of Chemistry
| | - Robert W. Schurko
- Department of Chemistry and Biochemistry
- University of Windsor
- Windsor
- Canada
| |
Collapse
|
34
|
Pandey MK, Kato H, Ishii Y, Nishiyama Y. Two-dimensional proton-detected 35Cl/1H correlation solid-state NMR experiment under fast magic angle sample spinning: application to pharmaceutical compounds. Phys Chem Chem Phys 2016; 18:6209-16. [DOI: 10.1039/c5cp06042g] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, we have measured 35Cl/1H correlations in hydrochloride salts of active pharmaceutical ingredients (HCl APIs) using the D-HMQC pulse sequence at fast MAS.
Collapse
Affiliation(s)
| | | | | | - Yusuke Nishiyama
- RIKEN CLST-JEOL Collaboration Center
- RIKEN
- Yokohama
- Japan
- JEOL RESONANCE Inc
| |
Collapse
|
35
|
Robertson AJ, Pandey MK, Marsh A, Nishiyama Y, Brown SP. The use of a selective saturation pulse to suppress t1 noise in two-dimensional (1)H fast magic angle spinning solid-state NMR spectroscopy. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2015; 260:89-97. [PMID: 26432398 DOI: 10.1016/j.jmr.2015.09.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 09/01/2015] [Accepted: 09/07/2015] [Indexed: 06/05/2023]
Abstract
A selective saturation pulse at fast magic angle spinning (MAS) frequencies (60+kHz) suppresses t1 noise in the indirect dimension of two-dimensional (1)H MAS NMR spectra. The method is applied to a synthetic nucleoside with an intense methyl (1)H signal due to triisopropylsilyl (TIPS) protecting groups. Enhanced performance in terms of suppressing the methyl signal while minimising the loss of signal intensity of nearby resonances of interest relies on reducing spin diffusion--this is quantified by comparing two-dimensional (1)H NOESY-like spin diffusion spectra recorded at 30-70 kHz MAS. For a saturation pulse centred at the methyl resonance, the effect of changing the nutation frequency at different MAS frequencies as well as the effect of changing the pulse duration is investigated. By applying a pulse of duration 30 ms and nutation frequency 725 Hz at 70 kHz MAS, a good compromise of significant suppression of the methyl resonance combined with the signal intensity of resonances greater than 5 ppm away from the methyl resonance being largely unaffected is achieved. The effectiveness of using a selective saturation pulse is demonstrated for both homonuclear (1)H-(1)H double quantum (DQ)/single quantum (SQ) MAS and (14)N-(1)H heteronuclear multiple quantum coherence (HMQC) two-dimensional solid-state NMR experiments.
Collapse
Affiliation(s)
- Aiden J Robertson
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom; Department of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Manoj Kumar Pandey
- RIKEN CLST-JEOL Collaboration Centre, Yokohama, Kanagawa 230-0045, Japan
| | - Andrew Marsh
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Yusuke Nishiyama
- RIKEN CLST-JEOL Collaboration Centre, Yokohama, Kanagawa 230-0045, Japan; JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan
| | - Steven P Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom.
| |
Collapse
|
36
|
Shen M, Trébosc J, O'Dell LA, Lafon O, Pourpoint F, Hu B, Chen Q, Amoureux JP. Comparison of various NMR methods for the indirect detection of nitrogen-14 nuclei via protons in solids. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2015; 258:86-95. [PMID: 26232366 DOI: 10.1016/j.jmr.2015.06.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 06/11/2015] [Accepted: 06/18/2015] [Indexed: 06/04/2023]
Abstract
We present an experimental comparison of several through-space Hetero-nuclear Multiple-Quantum Correlation experiments, which allow the indirect observation of homo-nuclear single- (SQ) or double-quantum (DQ) (14)N coherences via spy (1)H nuclei. These (1)H-{(14)N} D-HMQC sequences differ not only by the order of (14)N coherences evolving during the indirect evolution, t1, but also by the radio-frequency (rf) scheme used to excite and reconvert these coherences under Magic-Angle Spinning (MAS). Here, the SQ coherences are created by the application of center-band frequency-selective pulses, i.e. long and low-power rectangular pulses at the (14)N Larmor frequency, ν0((14)N), whereas the DQ coherences are excited and reconverted using rf irradiation either at ν0((14)N) or at the (14)N overtone frequency, 2ν0((14)N). The overtone excitation is achieved either by constant frequency rectangular pulses or by frequency-swept pulses, specifically Wide-band, Uniform-Rate, and Smooth-Truncation (WURST) pulse shapes. The present article compares the performances of four different (1)H-{(14)N} D-HMQC sequences, including those with (14)N rectangular pulses at ν0((14)N) for the indirect detection of homo-nuclear (i) (14)N SQ or (ii) DQ coherences, as well as their overtone variants using (iii) rectangular or (iv) WURST pulses. The compared properties include: (i) the sensitivity, (ii) the spectral resolution in the (14)N dimension, (iii) the rf requirements (power and pulse length), as well as the robustness to (iv) rf offset and (v) MAS frequency instabilities. Such experimental comparisons are carried out for γ-glycine and l-histidine.HCl monohydrate, which contain (14)N sites subject to moderate quadrupole interactions. We demonstrate that the optimum choice of the (1)H-{(14)N} D-HMQC method depends on the experimental goal. When the sensitivity and/or the robustness to offset are the major concerns, the D-HMQC sequence allowing the indirect detection of (14)N SQ coherences should be employed. Conversely, when the highest resolution and/or adjusted indirect spectral width are needed, overtone experiments are the method of choice. The overtone scheme using WURST pulses results in broader excitation bandwidths than that using rectangular pulses, at the expense of reduced sensitivity. Numerically exact simulations also show that the sensitivity of the overtone (1)H-{(14)N} D-HMQC experiment increases for larger quadrupole interactions.
Collapse
Affiliation(s)
- Ming Shen
- UCCS, CNRS UMR 8181, Univ. Lille, Villeneuve d'Ascq 59652, France; Physics Department & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China
| | - Julien Trébosc
- UCCS, CNRS UMR 8181, Univ. Lille, Villeneuve d'Ascq 59652, France
| | - Luke A O'Dell
- Institute for Frontier Materials, Deakin University, Waurn Ponds Campus, Geelong, Victoria 3220, Australia
| | - Olivier Lafon
- UCCS, CNRS UMR 8181, Univ. Lille, Villeneuve d'Ascq 59652, France.
| | | | - Bingwen Hu
- Physics Department & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China
| | - Qun Chen
- Physics Department & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China
| | - Jean-Paul Amoureux
- UCCS, CNRS UMR 8181, Univ. Lille, Villeneuve d'Ascq 59652, France; Physics Department & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China.
| |
Collapse
|
37
|
Pandey MK, Nishiyama Y. Proton-detected 3D (14)N/(14)N/(1)H isotropic shift correlation experiment mediated through (1)H-(1)H RFDR mixing on a natural abundant sample under ultrafast MAS. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2015; 258:96-101. [PMID: 26232769 DOI: 10.1016/j.jmr.2015.06.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 06/22/2015] [Accepted: 06/29/2015] [Indexed: 06/04/2023]
Abstract
In this contribution, we have demonstrated a proton detection-based approach on a natural abundant powdered l-Histidine HCl-H2O sample at ultrafast magic angle spinning (MAS) to accomplish (14)N/(14)N correlation from a 3D (14)N/(14)N/(1)H isotropic shift correlation experiment mediated through (1)H finite-pulse radio frequency-driven recoupling (fp-RFDR). Herein the heteronuclear magnetization transfer between (14)N and (1)H has been achieved by HMQC experiment, whereas (14)N/(14)N correlation is attained through enhanced (1)H-(1)H spin diffusion process due to (1)H-(1)H dipolar recoupling during the RFDR mixing. While the use of ultrafast MAS (90kHz) provides sensitivity enhancement through increased (1)H transverse relaxation time (T2), the use of micro-coil probe which can withstand strong (14)N radio frequency (RF) fields further improves the sensitivity per unit sample volume.
Collapse
Affiliation(s)
- Manoj Kumar Pandey
- RIKEN CLST-JEOL Collaboration Center, RIKEN, Yokohama, Kanagawa 230-0045, Japan
| | - Yusuke Nishiyama
- RIKEN CLST-JEOL Collaboration Center, RIKEN, Yokohama, Kanagawa 230-0045, Japan; JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan.
| |
Collapse
|
38
|
Haies IM, Jarvis JA, Brown LJ, Kuprov I, Williamson PTF, Carravetta M. (14)N overtone transition in double rotation solid-state NMR. Phys Chem Chem Phys 2015; 17:23748-53. [PMID: 26299667 DOI: 10.1039/c5cp03266k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Solid-state NMR transitions involving outer energy levels of the spin-1 (14)N nucleus are immune, to first order in perturbation theory, to the broadening caused by the nuclear quadrupole interaction. The corresponding overtone spectra, when acquired in conjunction with magic-angle sample spinning, result in lines, which are just a few kHz wide, permitting the direct detection of nitrogen compounds without the need for labeling. Despite the success of this technique, "overtone" resonances are still broadened due to indirect, second order effects arising from the large quadrupolar interaction. Here we demonstrate that another order of magnitude in spectral resolution may be gained by using double rotation. This brings the width of the (14)N solid-state NMR lines much closer to the region commonly associated with high-resolution solid-state NMR spectroscopy of (15)N and demonstrates the improvements in resolution that may be possible through the development of pulsed methodologies to suppress these second order effects.
Collapse
Affiliation(s)
- Ibraheem M Haies
- School of Chemistry, University of Southampton, SO17 1BJ, Southampton, UK.
| | | | | | | | | | | |
Collapse
|
39
|
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.
Collapse
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.
| |
Collapse
|
40
|
Ashbrook SE, Sneddon S. New methods and applications in solid-state NMR spectroscopy of quadrupolar nuclei. J Am Chem Soc 2014; 136:15440-56. [PMID: 25296129 DOI: 10.1021/ja504734p] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Solid-state nuclear magnetic resonance (NMR) spectroscopy has long been established as offering unique atomic-scale and element-specific insight into the structure, disorder, and dynamics of materials. NMR spectra of quadrupolar nuclei (I > (1)/2) are often perceived as being challenging to acquire and to interpret because of the presence of anisotropic broadening arising from the interaction of the electric field gradient and the nuclear electric quadrupole moment, which broadens the spectral lines, often over several megahertz. Despite the vast amount of information contained in the spectral line shapes, the problems with sensitivity and resolution have, until very recently, limited the application of NMR spectroscopy of quadrupolar nuclei in the solid state. In this Perspective, we provide a brief overview of the quadrupolar interaction, describe some of the basic experimental approaches used for acquiring high-resolution NMR spectra, and discuss the information that these spectra can provide. We then describe some interesting recent examples to showcase some of the more exciting and challenging new applications of NMR spectra of quadrupolar nuclei in the fields of energy materials, microporous materials, Earth sciences, and biomaterials. Finally, we consider the possible directions that this highly informative technique may take in the future.
Collapse
Affiliation(s)
- Sharon E Ashbrook
- School of Chemistry, EaStCHEM, and Centre of Magnetic Resonance, University of St Andrews , St Andrews KY16 9ST, United Kingdom
| | | |
Collapse
|
41
|
Dib E, Alonso B, Mineva T. DFT-D Study of 14N Nuclear Quadrupolar Interactions in Tetra-n-alkyl Ammonium Halide Crystals. J Phys Chem A 2014; 118:3525-33. [DOI: 10.1021/jp502858n] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eddy Dib
- ICGM-MACS, UMR 5253 CNRS-ENSCM-UM2-UM1,
Institut Charles Gerhardt de Montpellier, 8 rue de l’Ecole normale, 34296 Montpellier cedex 5, France
| | - Bruno Alonso
- ICGM-MACS, UMR 5253 CNRS-ENSCM-UM2-UM1,
Institut Charles Gerhardt de Montpellier, 8 rue de l’Ecole normale, 34296 Montpellier cedex 5, France
| | - Tzonka Mineva
- ICGM-MACS, UMR 5253 CNRS-ENSCM-UM2-UM1,
Institut Charles Gerhardt de Montpellier, 8 rue de l’Ecole normale, 34296 Montpellier cedex 5, France
| |
Collapse
|
42
|
Rossini AJ, Emsley L, O'Dell LA. Dynamic nuclear polarisation enhanced14N overtone MAS NMR spectroscopy. Phys Chem Chem Phys 2014; 16:12890-9. [DOI: 10.1039/c4cp00590b] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dynamic nuclear polarisation has been used to obtain solid-state14N overtone NMR spectra with signal enhancement levels of over two orders of magnitude, including natural abundance C–N and H–N correlation spectra.
Collapse
Affiliation(s)
- Aaron J. Rossini
- Centre de RMN à Trés Hauts Champs
- Institut de Sciences Analytiques
- Université de Lyon (CNRS/ENS Lyon/UCB Lyon 1)
- 69100 Villeurbanne, France
| | - Lyndon Emsley
- Centre de RMN à Trés Hauts Champs
- Institut de Sciences Analytiques
- Université de Lyon (CNRS/ENS Lyon/UCB Lyon 1)
- 69100 Villeurbanne, France
| | - Luke A. O'Dell
- Institute for Frontier Materials
- Deakin University
- Geelong, Australia
| |
Collapse
|
43
|
Harris KJ, Veinberg SL, Mireault CR, Lupulescu A, Frydman L, Schurko RW. Rapid Acquisition of14N Solid-State NMR Spectra with Broadband Cross Polarization. Chemistry 2013; 19:16469-75. [DOI: 10.1002/chem.201301862] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Indexed: 11/09/2022]
|
44
|
O'Dell LA, Brinkmann A. 14N overtone NMR spectra under magic angle spinning: experiments and numerically exact simulations. J Chem Phys 2013; 138:064201. [PMID: 23425463 DOI: 10.1063/1.4775592] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
It was recently shown that high resolution (14)N overtone NMR spectra can be obtained directly under magic angle spinning (MAS) conditions [L. A. O'Dell and C. I. Ratcliffe, Chem. Phys. Lett. 514, 168 (2011)]. Preliminary experimental results showed narrowed powder pattern widths, a frequency shift that is dependent on the MAS rate, and an apparent absence of spinning sidebands, observations which appeared to be inconsistent with previous theoretical treatments. Herein, we reproduce these effects using numerically exact simulations that take into account the full nuclear spin Hamiltonian. Under sample spinning, the (14)N overtone signal is split into five (0, ±1, ±2) overtone sidebands separated by the spinning frequency. For a powder sample spinning at the magic angle, the +2ω(r) sideband is dominant while the others show significantly lower signal intensities. The resultant MAS powder patterns show characteristic quadrupolar lineshapes from which the (14)N quadrupolar parameters and isotropic chemical shift can be determined. Spinning the sample at other angles is shown to alter both the shapes and relative intensities of the five overtone sidebands, with MAS providing the benefit of averaging dipolar couplings and shielding anisotropy. To demonstrate the advantages of this experimental approach, we present the (14)N overtone MAS spectrum obtained from L-histidine, in which powder patterns from all three nitrogen sites are clearly resolved.
Collapse
Affiliation(s)
- Luke A O'Dell
- Measurement Science and Standards, National Research Council Canada, 1200 Montreal Road, M40, Ottawa, Ontario K1A 0R6, Canada
| | | |
Collapse
|
45
|
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]
|
46
|
Nishiyama Y, Malon M, Gan Z, Endo Y, Nemoto T. Proton-nitrogen-14 overtone two-dimensional correlation NMR spectroscopy of solid-sample at very fast magic angle sample spinning. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2013; 230:160-164. [PMID: 23542742 DOI: 10.1016/j.jmr.2013.02.015] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2012] [Revised: 02/25/2013] [Accepted: 02/28/2013] [Indexed: 06/02/2023]
Abstract
(1)H-(14)N overtone (OT) heteronuclear multiple quantum coherence (HMQC) experiment at very fast magic angle spinning (MAS) is reported. The (14)N OT coherence is excited and reconverted by (14)N OT pulses at twice the (14)N Larmor frequency. The OT coherence is free from the first order quadrupolar broadening. MAS further removes the broadening due to chemical shift anisotropy (CSA). With a small 0.75 mm MAS rotor and coil system, very fast MAS up to 90 kHz and very strong rf field are achieved, enhancing the sensitivity of indirect (14)N OT observation via protons. In comparison with (1)H-(14)N double-quantum HMQC, an enhancement factor of 1.8 is obtained for glycine with the (14)N OT irradiation. The bandwidth in the (14)N OT dimension is limited due to long (14)N OT pulses.
Collapse
|
47
|
Jarvis JA, Haies IM, Williamson PTF, Carravetta M. An efficient NMR method for the characterisation of 14N sites through indirect 13C detection. Phys Chem Chem Phys 2013; 15:7613-20. [PMID: 23589073 PMCID: PMC3695532 DOI: 10.1039/c3cp50787d] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nitrogen is one of the most abundant elements and plays a key role in the chemistry of biological systems. Despite its widespread distribution, the study of the naturally occurring isotope of nitrogen, (14)N (99.6%), has been relatively limited as it is a spin-1 nucleus that typically exhibits a large quadrupolar interaction. Accordingly, most studies of nitrogen sites in biomolecules have been performed on samples enriched with (15)N, limiting the application of NMR to samples which can be isotopically enriched. This precludes the analysis of naturally occurring samples and results in the loss of the wealth of structural and dynamic information that the quadrupolar interaction can provide. Recently, several experimental approaches have been developed to characterize (14)N sites through their interaction with neighboring 'spy' nuclei. Here we describe a novel version of these experiments whereby coherence between the (14)N site and the spy nucleus is mediated by the application of a moderate rf field to the (14)N. The resulting (13)C/(14)N spectra show good sensitivity on natural abundance and labeled materials; whilst the (14)N lineshapes permit the quantitative analysis of the quadrupolar interaction.
Collapse
Affiliation(s)
- James A Jarvis
- Centre for Biological Sciences, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK
| | | | | | | |
Collapse
|
48
|
Tatton AS, Pham TN, Vogt FG, Iuga D, Edwards AJ, Brown SP. Probing Hydrogen Bonding in Cocrystals and Amorphous Dispersions Using 14N–1H HMQC Solid-State NMR. Mol Pharm 2013; 10:999-1007. [DOI: 10.1021/mp300423r] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrew S. Tatton
- Department
of Physics, University of Warwick, Coventry
CV4 7AL, United Kingdom
| | - Tran N. Pham
- GlaxoSmithKline plc, Product Development, Gunnels Wood Road, Stevenage
SG1 2NY, United Kingdom
| | - Frederick G. Vogt
- GlaxoSmithKline plc, Product Development, 709 Swedeland
Road, King of Prussia, Pennsylvania
19406, United States
| | - Dinu Iuga
- Department
of Physics, University of Warwick, Coventry
CV4 7AL, United Kingdom
| | - Andrew J. Edwards
- GlaxoSmithKline plc, Product Development, Gunnels Wood Road, Stevenage
SG1 2NY, United Kingdom
| | - Steven P. Brown
- Department
of Physics, University of Warwick, Coventry
CV4 7AL, United Kingdom
| |
Collapse
|
49
|
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]
|
50
|
O'Dell LA, He R, Pandohee J. Identifying H–N proximities in solid-state NMR using 14N overtone irradiation under fast MAS. CrystEngComm 2013. [DOI: 10.1039/c3ce40967h] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|