1
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Wijesekara AV, Venkatesh A, Lampkin BJ, VanVeller B, Lubach JW, Nagapudi K, Hung I, Gor'kov PL, Gan Z, Rossini AJ. Fast Acquisition of Proton-Detected HETCOR Solid-State NMR Spectra of Quadrupolar Nuclei and Rapid Measurement of NH Bond Lengths by Frequency Selective HMQC and RESPDOR Pulse Sequences. Chemistry 2020; 26:7881-7888. [PMID: 32315472 DOI: 10.1002/chem.202000390] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 04/20/2020] [Indexed: 12/14/2022]
Abstract
Fast magic-angle spinning (MAS), frequency selective (FS) heteronuclear multiple quantum coherence (HMQC) experiments which function in an analogous manner to solution SOFAST HMQC NMR experiments, are demonstrated. Fast MAS enables efficient FS excitation of 1 H solid-state NMR signals. Selective excitation and observation preserves 1 H magnetization, leading to a significant shortening of the optimal inter-scan delay. Dipolar and scalar 1 H{14 N} FS HMQC solid-state NMR experiments routinely provide 4- to 9-fold reductions in experiment times as compared to conventional 1 H{14 N} HMQC solid-state NMR experiments. 1 H{14 N} FS resonance-echo saturation-pulse double-resonance (RESPDOR) allowed dipolar dephasing curves to be obtained in minutes, enabling the rapid determination of NH dipolar coupling constants and internuclear distances. 1 H{14 N} FS RESPDOR was used to assign multicomponent active pharmaceutical ingredients (APIs) as salts or cocrystals. FS HMQC also provided enhanced sensitivity for 1 H{17 O} and 1 H{35 Cl} HMQC experiments on 17 O-labeled Fmoc-alanine and histidine hydrochloride monohydrate, respectively. FS HMQC and FS RESPDOR experiments will provide access to valuable structural constraints from materials that are challenging to study due to unfavorable relaxation times or dilution of the nuclei of interest.
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Affiliation(s)
- Anuradha V Wijesekara
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA.,US DOE Ames Laboratory, Ames, IA, 50011, USA
| | - Amrit Venkatesh
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA.,US DOE Ames Laboratory, Ames, IA, 50011, USA
| | - Bryan J Lampkin
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA
| | - Brett VanVeller
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA
| | | | | | - Ivan Hung
- Center of Interdisciplinary Magnetic Resonance (CIMAR), National High Magnetic Field Laboratory (NHMFL), Tallahassee, FL, 32310, USA
| | - Peter L Gor'kov
- Center of Interdisciplinary Magnetic Resonance (CIMAR), National High Magnetic Field Laboratory (NHMFL), Tallahassee, FL, 32310, USA
| | - Zhehong Gan
- Center of Interdisciplinary Magnetic Resonance (CIMAR), National High Magnetic Field Laboratory (NHMFL), Tallahassee, FL, 32310, USA
| | - Aaron J Rossini
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA.,US DOE Ames Laboratory, Ames, IA, 50011, USA
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2
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Cordes N, Bräuniger T, Schnick W. Ammonothermal Synthesis of EAM
O2
N (EA
= Sr, Ba; M
= Nb, Ta) Perovskites and 14
N Solid-State NMR Spectroscopic Investigations of AM
(O,N)3
(A
= Ca, Sr, Ba, La). Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800827] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Niklas Cordes
- Department of Chemistry; University of Munich (LMU); Butenandtstrasse 5-13 81388 Munich Germany
| | - Thomas Bräuniger
- Department of Chemistry; University of Munich (LMU); Butenandtstrasse 5-13 81388 Munich Germany
| | - Wolfgang Schnick
- Department of Chemistry; University of Munich (LMU); Butenandtstrasse 5-13 81388 Munich Germany
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3
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Gan Z, Hung I, Nishiyama Y, Amoureux JP, Lafon O, Nagashima H, Trébosc J, Hu B. 14N overtone nuclear magnetic resonance of rotating solids. J Chem Phys 2018; 149:064201. [PMID: 30111134 PMCID: PMC8808743 DOI: 10.1063/1.5044653] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Accepted: 07/17/2018] [Indexed: 11/14/2022] Open
Abstract
By irradiating and observing at twice the 14N Larmor frequency, overtone (OT) nuclear magnetic resonance (NMR) is capable of obtaining 14NOT spectra without first-order quadrupolar broadening. Direct excitation and detection of the usually "forbidden" double-quantum transition is mediated by the perturbation from the large quadrupole interaction to the spin states quantized by the Zeeman interaction. A recent study [L. A. O'Dell and C. I. Ratcliffe, Chem. Phys. Lett. 514, 168 (2011)] has shown that 14NOT NMR under magic-angle spinning (MAS) can yield high-resolution spectra with typical second-order quadrupolar line shapes allowing the measurement of 14N chemical shift and quadrupolar coupling parameters. This article has also shown that under MAS the main 14NOT peak is shifted by twice the sample spinning frequency with respect to its static position. We present the theory of 14NOT NMR of static or rotating samples and the physical picture of the intriguing spinning-induced shift in the second case. We use perturbation theory for the case of static samples and Floquet theory for rotating samples. In both cases, the results can be described by a so-called OT parameter that scales down the 14NOT radio-frequency (rf) excitation and signal detection. This OT parameter shows that the components of the rf field, which are transverse and longitudinal with respect to the magnetic field, are both effective for 14NOTrf excitation and signal detection. In the case of MAS at angular frequency ωr , the superposition of the excitation and detection components in the OT parameter makes either the +2ωr or -2ωr term the dominant 14NOT signal, depending on the sense of sample spinning with respect to the magnetic field. This leads to an apparent 14NOT signal shifted at twice the spinning frequency. The features of 14NOT NMR spectra for both static and rotating samples are illustrated with simulations. The spinning induced shift and its dependence on the spinning direction are confirmed experimentally by reversing the spinning direction and the field of the 36 T series-connected hybrid magnet at the US National High Magnetic Field Laboratory.
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Affiliation(s)
- Zhehong Gan
- Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
| | - Ivan Hung
- Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
| | | | | | | | - Hiroki Nagashima
- Univ. Lille, CNRS UMR 8181, UCCS Unit of Catalysis and Chemistry of Solids, F-59000 Lille, France
| | - Julien Trébosc
- Univ. Lille, CNRS UMR 8181, UCCS Unit of Catalysis and Chemistry of Solids, F-59000 Lille, France
| | - Bingwen Hu
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, Shanghai 200062, China
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4
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O'Dell LA. Direct detection of nitrogen-14 in solid-state NMR spectroscopy. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2011; 59:295-318. [PMID: 22027340 DOI: 10.1016/j.pnmrs.2011.04.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2011] [Accepted: 04/07/2011] [Indexed: 05/31/2023]
Affiliation(s)
- Luke A O'Dell
- Steacie Institute for Molecular Sciences, National Research Council, 100 Sussex Drive, Ottawa, Ontario, Canada K1N 5A2.
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5
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Jakobsen HJ, Bildsøe H, Gan Z, Brey WW. Experimental aspects in acquisition of wide bandwidth solid-state MAS NMR spectra of low-γ nuclei with different opportunities on two commercial NMR spectrometers. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2011; 211:195-206. [PMID: 21704544 DOI: 10.1016/j.jmr.2011.05.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2011] [Revised: 05/25/2011] [Accepted: 05/26/2011] [Indexed: 05/31/2023]
Abstract
The acquisition and different appearances observed for wide bandwidth solid-state MAS NMR spectra of low-γ nuclei, using (14)N as an illustrative nucleus and employing two different commercial spectrometers (Varian, 14.1T and Bruker, 19.6T), have been compared/evaluated and optimized from an experimental NMR and an electronic engineering point of view, to account for the huge differences in these spectra. The large differences in their spectral appearances, employing the recommended/standard experimental set-up for the two different spectrometers, are shown to be associated with quite large differences in the electronic design of the two types of preamplifiers, which are connected to their respective probes through a 50Ω cable, and are here completely accounted for. This has led to different opportunities for optimum performances in the acquisition of nearly ideal wide bandwidth spectra for low-γ nuclei on the two spectrometers by careful evaluation of the length for the 50Ω probe-to-preamp cable for the Varian system and appropriate changes to the bandwidth (Q) of the NMR probe used on the Bruker spectrometer. Earlier, we reported quite distorted spectra obtained with Varian Unity INOVA spectrometers (at 11.4 and 14.1T) in several exploratory wide bandwidth (14)N MAS NMR studies of inorganic nitrates and amino acids. These spectra have now been compared/evaluated with fully analyzed (14)N MAS spectra correspondingly acquired at 19.6T on a Bruker spectrometer. It is shown that our upgraded version of the STARS simulation/iterative-fitting software is capable of providing identical sets for the molecular spectral parameters and corresponding fits to the experimental spectra, which fully agree with the electronic measurements, despite the highly different appearances for the MAS NMR spectra acquired on the Varian and Bruker spectrometers.
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Affiliation(s)
- Hans J Jakobsen
- Instrument Centre for Solid-State NMR Spectroscopy and Interdisciplinary Nanoscience Center (iNANO), Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark.
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6
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Cavadini S. Indirect detection of nitrogen-14 in solid-state NMR spectroscopy. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2010; 56:46-77. [PMID: 20633348 DOI: 10.1016/j.pnmrs.2009.08.001] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2009] [Accepted: 08/12/2009] [Indexed: 05/29/2023]
Affiliation(s)
- Simone Cavadini
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, Batochime, Lausanne, Switzerland.
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7
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Alonso B, Massiot D, Florian P, Paradies HH, Gaveau P, Mineva T. 14N and 81Br Quadrupolar Nuclei as Sensitive NMR Probes of n-Alkyltrimethylammonium Bromide Crystal Structures. An Experimental and Theoretical Study. J Phys Chem B 2009; 113:11906-20. [DOI: 10.1021/jp9027904] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bruno Alonso
- Institut Charles Gerhardt de Montpellier, Matériaux Avancés pour la Catalyse et la Santé, ICGM-MACS, UMR 5253 CNRS-ENSCM-UM2-UM1, 8 rue de l’Ecole Normale, 34296 Montpellier cedex 5, France, CEMHTI, CNRS UPR3079 Université d’Orléans, 1D av. de la Recherche Scientifique, 45071 Orléans cedex 2, France, and The University of Salford, Joule Physics Laboratory, School of Computing, Science and Engineering, Materials Research Institute, Manchester, M 5 4WT, United Kingdom
| | - Dominique Massiot
- Institut Charles Gerhardt de Montpellier, Matériaux Avancés pour la Catalyse et la Santé, ICGM-MACS, UMR 5253 CNRS-ENSCM-UM2-UM1, 8 rue de l’Ecole Normale, 34296 Montpellier cedex 5, France, CEMHTI, CNRS UPR3079 Université d’Orléans, 1D av. de la Recherche Scientifique, 45071 Orléans cedex 2, France, and The University of Salford, Joule Physics Laboratory, School of Computing, Science and Engineering, Materials Research Institute, Manchester, M 5 4WT, United Kingdom
| | - Pierre Florian
- Institut Charles Gerhardt de Montpellier, Matériaux Avancés pour la Catalyse et la Santé, ICGM-MACS, UMR 5253 CNRS-ENSCM-UM2-UM1, 8 rue de l’Ecole Normale, 34296 Montpellier cedex 5, France, CEMHTI, CNRS UPR3079 Université d’Orléans, 1D av. de la Recherche Scientifique, 45071 Orléans cedex 2, France, and The University of Salford, Joule Physics Laboratory, School of Computing, Science and Engineering, Materials Research Institute, Manchester, M 5 4WT, United Kingdom
| | - Henrich H. Paradies
- Institut Charles Gerhardt de Montpellier, Matériaux Avancés pour la Catalyse et la Santé, ICGM-MACS, UMR 5253 CNRS-ENSCM-UM2-UM1, 8 rue de l’Ecole Normale, 34296 Montpellier cedex 5, France, CEMHTI, CNRS UPR3079 Université d’Orléans, 1D av. de la Recherche Scientifique, 45071 Orléans cedex 2, France, and The University of Salford, Joule Physics Laboratory, School of Computing, Science and Engineering, Materials Research Institute, Manchester, M 5 4WT, United Kingdom
| | - Philippe Gaveau
- Institut Charles Gerhardt de Montpellier, Matériaux Avancés pour la Catalyse et la Santé, ICGM-MACS, UMR 5253 CNRS-ENSCM-UM2-UM1, 8 rue de l’Ecole Normale, 34296 Montpellier cedex 5, France, CEMHTI, CNRS UPR3079 Université d’Orléans, 1D av. de la Recherche Scientifique, 45071 Orléans cedex 2, France, and The University of Salford, Joule Physics Laboratory, School of Computing, Science and Engineering, Materials Research Institute, Manchester, M 5 4WT, United Kingdom
| | - Tzonka Mineva
- Institut Charles Gerhardt de Montpellier, Matériaux Avancés pour la Catalyse et la Santé, ICGM-MACS, UMR 5253 CNRS-ENSCM-UM2-UM1, 8 rue de l’Ecole Normale, 34296 Montpellier cedex 5, France, CEMHTI, CNRS UPR3079 Université d’Orléans, 1D av. de la Recherche Scientifique, 45071 Orléans cedex 2, France, and The University of Salford, Joule Physics Laboratory, School of Computing, Science and Engineering, Materials Research Institute, Manchester, M 5 4WT, United Kingdom
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8
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Qian C, Fu R, Gor'kov P, Brey WW, Cross TA, Gan Z. 14N Polarization Inversion Spin Exchange at Magic Angle (PISEMA). JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2009; 196:96-99. [PMID: 18986816 DOI: 10.1016/j.jmr.2008.10.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2008] [Revised: 10/10/2008] [Accepted: 10/11/2008] [Indexed: 05/27/2023]
Abstract
Polarization Inversion Spin Exchange at Magic Angle (PISEMA) is a powerful experiment for determining peptide orientation in uniformly aligned samples such as planar membranes. In this paper, we present (14)N-PISEMA experiment which correlates (14)N quadrupolar coupling and (14)N-(1)H dipolar coupling. (14)N-PISEMA enables the use of (14)N quadrupolar coupling tensor as an ultra sensitive probe for peptide orientation and can be carried out without the need of isotope enrichment. The experiment is based on selective spin-exchange between a proton and a single-quantum transition of (14)N spins. The spin-exchange dynamics is described and the experiment is demonstrated with a natural abundant N-acetyl valine crystal sample.
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Affiliation(s)
- Chunqi Qian
- Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
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9
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O’Dell LA, Schurko RW. Static solid-state 14N NMR and computational studies of nitrogen EFG tensors in some crystalline amino acids. Phys Chem Chem Phys 2009; 11:7069-77. [DOI: 10.1039/b906114b] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Amoureux JP, Trébosc J, Hu B, Halpern-Manners N, Antonijevic S. High-resolution 14N-edited 1H-13C correlation NMR experiment to study biological solids. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2008; 194:317-320. [PMID: 18707905 DOI: 10.1016/j.jmr.2008.07.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2008] [Revised: 07/21/2008] [Accepted: 07/23/2008] [Indexed: 05/26/2023]
Abstract
It was recently shown that nuclear magnetic resonance (NMR) spectra of nitrogen-14 (spin I=1) can be obtained by indirect detection via spin S=1/2 nuclei in powders spinning at the magic angle. An increased number of solid-state NMR methods are now available to tailor sequences for specific purposes, e.g., hetero-nuclear dipolar recoupling or homo-nuclear dipolar decoupling schemes. Here, we combine the latest recoupling and decoupling techniques to obtain high-resolution (1)H-(13)C through-space correlation spectra, where only the correlation peaks of those carbons close to nitrogen nuclei are observed. The experiment is demonstrated on a (13)C enriched l-histidine. HCl x H(2)O powder sample.
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Affiliation(s)
- Jean-Paul Amoureux
- Unité de Catalyse et Chimie du Solide, UMR-CNRS 8181, Université de Lille 1, 59652 Villeneuve d'Ascq cedex, France.
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11
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Siegel R, Trébosc J, Amoureux JP, Gan Z. 3D 1H-13C-14N correlation solid-state NMR spectrum. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2008; 193:321-325. [PMID: 18554970 DOI: 10.1016/j.jmr.2008.05.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2008] [Revised: 05/14/2008] [Accepted: 05/15/2008] [Indexed: 05/26/2023]
Abstract
Nitrogen-14 (spin I=1) has always been a nucleus difficult to observe in solid-state NMR and until recently its observation was restricted to one-dimensional (1D) spectra. We present here the first 3D 1H-13C-14N NMR correlation spectrum. This spectrum was acquired on a test sample L-histidine.HCl.H2O using a recently developed technique, which consists in indirectly observing 14N nuclei via dipolar recoupling with an HMQC-type experiment.
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Affiliation(s)
- Renée Siegel
- UCCS (CNRS-8181), University of Lille-1, Fr-59652 Villeneuve d'Ascq, France
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12
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Ramamoorthy A, Lee DK, Santos JS, Henzler-Wildman KA. Nitrogen-14 Solid-State NMR Spectroscopy of Aligned Phospholipid Bilayers to Probe Peptide−Lipid Interaction and Oligomerization of Membrane Associated Peptides. J Am Chem Soc 2008; 130:11023-9. [DOI: 10.1021/ja802210u] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ayyalusamy Ramamoorthy
- Biophysics and Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055
| | - Dong-Kuk Lee
- Biophysics and Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055
| | - Jose S. Santos
- Biophysics and Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055
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13
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Gan Z. Measuring nitrogen quadrupolar coupling with13C detected wide-line 14N NMR under magic-angle spinning. Chem Commun (Camb) 2008:868-70. [DOI: 10.1039/b716383e] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Amoureux JP, Wang Q, Hu B, Lafon O, Trébosc J, Deng F. Rapid analysis of isotopically unmodified amino acids by high-resolution 14N-edited 1H–13C correlation NMR spectroscopy. Chem Commun (Camb) 2008:6525-7. [DOI: 10.1039/b816362f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Cavadini S, Antonijevic S, Lupulescu A, Bodenhausen G. Indirect Detection of Nitrogen-14 in Solid-State NMR Spectroscopy. Chemphyschem 2007; 8:1363-74. [PMID: 17503424 DOI: 10.1002/cphc.200700049] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
NMR spectra of (14)N (spin I=1) are obtained by indirect detection in powders spinning at the magic angle. The method relies on the transfer of coherence from a neighboring "spy" nucleus with S=1/2, such as (13)C or (1)H, to single- or double-quantum transitions of (14)N nuclei. The transfer of coherence can occur through a combination of scalar and residual dipolar splittings (RDS); the latter are also known as second-order quadrupole-dipole cross terms. The two-dimensional NMR spectra reveal powder patterns determined by second- and third-order quadrupolar couplings. These spectra depend on the quadrupolar coupling constant C(Q) (typically a few megahertz), on the asymmetry parameter eta(Q) of the (14)N nucleus, and on the orientation of the internuclear vector r(IS) between the I ((14)N) and S (spy) nuclei with respect to the quadrupolar tensor. These parameters, which can be subject to motional averaging, can reveal valuable information about the structure and dynamics of nitrogen-containing solids. Application of this technique to various amino acids, either enriched in (13)C or with natural carbon isotope abundance, with spectra recorded at various magnetic fields, illustrates the scope of the method.
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Affiliation(s)
- Simone Cavadini
- Laboratoire de Résonance Magnétique Biomoléculaire, Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, Batochime, 1015 Lausanne, Switzerland.
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16
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Giavani T, Bildsøe H, Skibsted J, Jakobsen HJ. A solid-state 14N magic-angle spinning NMR study of some amino acids. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2004; 166:262-272. [PMID: 14729038 DOI: 10.1016/j.jmr.2003.10.023] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Experimental strategies for the acquisition of high-quality 14N magic-angle spinning (MAS) NMR spectra of the simple amino acids, which exhibit 14N quadrupole coupling constants (C(Q)) on the order of 1.2 MHz, are devised. These are the first useful 14N MAS spectra reported for nitrogen compounds having a C(Q)(14N) value in excess of 1 MHz. The complete manifolds of spinning sidebands (ssbs), i.e., about 300 ssbs for a spinning frequency of 6.0 kHz, have been observed in the 14N MAS NMR spectra of a series of amino acids. In their crystal structure these amino acids all exhibit the zwitterionic form and thus the 14N MAS NMR spectra represent those of a rotating -NH(3)(+) group and not of an amino (-NH(2)) group. Computer simulations combined with fitting of simulated to the experimental ssb intensities result in the determination of precise values for the 14N quadrupole coupling (C(Q)) and its associated asymmetry parameter (eta(Q)) for the nitrogen sites in these molecules. For some of the amino acids the 14N MAS NMR spectra exhibit overlap between the manifolds of ssbs from two different nitrogen sites in accordance with their crystal structures. Computer analysis of these spectra results in two different sets of (C(Q), eta(Q)) values which mainly differ in the magnitudes for eta(Q).
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Affiliation(s)
- Tania Giavani
- Instrument Centre for Solid State NMR Spectroscopy, Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark
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17
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Determination of nitrogen chemical shift anisotropy from the second-order cross-term in 14N MAS NMR spectroscopy. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)01140-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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Giavani T, Bildsøe H, Skibsted J, Jakobsen HJ. 14N MAS NMR Spectroscopy and Quadrupole Coupling Data in Characterization of the IV ↔ III Phase Transition in Ammonium Nitrate. J Phys Chem B 2002. [DOI: 10.1021/jp013355t] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tania Giavani
- Instrument Centre for Solid State NMR Spectroscopy, Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark
| | - Henrik Bildsøe
- Instrument Centre for Solid State NMR Spectroscopy, Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark
| | - Jørgen Skibsted
- Instrument Centre for Solid State NMR Spectroscopy, Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark
| | - Hans J. Jakobsen
- Instrument Centre for Solid State NMR Spectroscopy, Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark
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19
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Marburger SP, Fung BM, Khitrin AK. 14N chemical shifts and quadrupole coupling constants of inorganic nitrates. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2002; 154:205-209. [PMID: 11846578 DOI: 10.1006/jmre.2001.2490] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The isotropic chemical shift and the nuclear quadrupole coupling constant for (14)N were obtained for 14 inorganic nitrates by solid-state MAS NMR measurements at two different field strengths, 9.4 and 11.7 T. The compounds studied were polycrystalline powders of AgNO(3), Al(NO(3))(3), Ba(NO(3))(2), Ca(NO(3))(2), CsNO(3), KNO(3), LiNO(3), Mg(NO(3))(2), NaNO(3), Pb(NO(3))(2), RbNO(3), Sr(NO(3))(2), Th(NO(3))(4)center dot4H(2)O, and UO(2)(NO(3))(2)center dot3H(2)O. Even though the spectra show broadening due to (14)N quadrupole interactions, linewidths of a few hundred hertz and a good signal-to-noise ratio were achieved. From the position of the central peaks at the two fields, the chemical shifts and the nuclear quadrupole coupling constants were calculated. The chemical shifts for all compounds studied range from 282 to 342 ppm with respect to NH(4)Cl. The nuclear quadrupole coupling constants range from 429 kHz for AgNO(3) to 993 kHz for LiNO(3). These data are compared with those available in the literature.
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Affiliation(s)
- Simon P Marburger
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019-3051, USA
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Jakobsen HJ, Bildsøe H, Skibsted J, Giavani T. (14)N MAS NMR spectroscopy: the nitrate ion. J Am Chem Soc 2001; 123:5098-9. [PMID: 11457341 DOI: 10.1021/ja0100118] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- H J Jakobsen
- Instrument Centre for Solid State NMR Spectroscopy, Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark
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