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Dai Y, Terskikh V, Wu G. A combined solid-state 1H, 13C, 17O NMR and periodic DFT study of hyperfine coupling tensors in paramagnetic copper(II) compounds. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2024; 132:101945. [PMID: 38968703 DOI: 10.1016/j.ssnmr.2024.101945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2024] [Revised: 06/21/2024] [Accepted: 06/24/2024] [Indexed: 07/07/2024]
Abstract
We report solid-state 1H, 13C, and 17O NMR determination of hyperfine coupling tensors (A-tensors) in several paramagnetic Cu(II) (d9, S = 1/2) complexes: trans-Cu(DL-Ala)2·H217O, Cu([1-13C]acetate)2·H2O, Cu([2-13C]acetate)2·H2O, and Cu(acetate)2·H217O. Using these new experimental results and some A-tensor data available in the literature for trans-Cu(L-Ala)2 and K2CuCl4·2H2O, we were able to examine the accuracy of A-tensor computation from a periodic DFT method implemented in the BAND program. We evaluated A-tensors on 1H (I = 1/2), 13C (I = 1/2), 14N (I = 1), 17O (I = 5/2), 39K (I = 3/2), 35Cl (I = 3/2), and 63Cu (I = 3/2) nuclei over a range spanning more than 3 orders of magnitude. We found that the BAND code can reproduce reasonably well the experimental results for both A-tensors and nuclear quadrupole coupling tensors.
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Affiliation(s)
- Yizhe Dai
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, K7L 3N6, Canada
| | - Victor Terskikh
- Metrology, National Research Council Canada, Ottawa, K1A 0R6, Canada
| | - Gang Wu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, K7L 3N6, Canada.
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Blahut J, Benda L, Lejeune AL, Sanders KJ, Burcher B, Jeanneau E, Proriol D, Catita L, Breuil PAR, Quoineaud AA, Pell AJ, Pintacuda G. Proton-detected fast-magic-angle spinning NMR of paramagnetic inorganic solids. RSC Adv 2021; 11:29870-29876. [PMID: 35479571 PMCID: PMC9040908 DOI: 10.1039/d1ra04110j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 08/17/2021] [Indexed: 02/01/2023] Open
Abstract
Fast (60 kHz) magic angle spinning solid-state NMR allows very sensitive proton detection in highly paramagnetic organometallic powders. We showcase this technique with the complete assignment of 1H and 13C resonances in a high-spin Fe(ii) polymerisation catalyst with less than 2 mg of sample at natural abundance.
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Affiliation(s)
- Jan Blahut
- Université de Lyon, Centre de RMN à Très Hauts Champs de Lyon (UMR 5082 - CNRS, ENS Lyon, UCB Lyon 1) 5 rue de la Doua 69100 Villeurbanne France
| | - Ladislav Benda
- Université de Lyon, Centre de RMN à Très Hauts Champs de Lyon (UMR 5082 - CNRS, ENS Lyon, UCB Lyon 1) 5 rue de la Doua 69100 Villeurbanne France
| | - Arthur L Lejeune
- Université de Lyon, Centre de RMN à Très Hauts Champs de Lyon (UMR 5082 - CNRS, ENS Lyon, UCB Lyon 1) 5 rue de la Doua 69100 Villeurbanne France
- IFP Energies Nouvelles, Rond-point de l'échangeur de Solaize 69360 Solaize France
| | - Kevin J Sanders
- Université de Lyon, Centre de RMN à Très Hauts Champs de Lyon (UMR 5082 - CNRS, ENS Lyon, UCB Lyon 1) 5 rue de la Doua 69100 Villeurbanne France
| | - Benjamin Burcher
- IFP Energies Nouvelles, Rond-point de l'échangeur de Solaize 69360 Solaize France
| | - Erwann Jeanneau
- Université de Lyon, Centre de Diffractométrie Henri Longchambon (UCB Lyon 1) 5 rue de la Doua 69100 Villeurbanne France
| | - David Proriol
- IFP Energies Nouvelles, Rond-point de l'échangeur de Solaize 69360 Solaize France
| | - Leonor Catita
- IFP Energies Nouvelles, Rond-point de l'échangeur de Solaize 69360 Solaize France
| | | | | | - Andrew J Pell
- Université de Lyon, Centre de RMN à Très Hauts Champs de Lyon (UMR 5082 - CNRS, ENS Lyon, UCB Lyon 1) 5 rue de la Doua 69100 Villeurbanne France
- Stockholm University, Department of Materials and Environmental Chemistry Svante Arrhenius väg 16C SE-106 91 Stockholm Sweden
| | - Guido Pintacuda
- Université de Lyon, Centre de RMN à Très Hauts Champs de Lyon (UMR 5082 - CNRS, ENS Lyon, UCB Lyon 1) 5 rue de la Doua 69100 Villeurbanne France
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Duong NT, Yarava JR, Trébosc J, Nishiyama Y, Amoureux JP. Forcing the 'lazy' protons to work. Phys Chem Chem Phys 2018; 20:25829-25840. [PMID: 30285019 DOI: 10.1039/c8cp03601b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The combination of cross-polarization (CP) with flip-back (FB) pulse has enabled in NMR the enhancement of 13C sensitivity and the decrease of the recycling delay at both moderate and fast magic-angle spinning (MAS) frequencies. However, only continuous-wave (CW) decoupling is presently compatible with FB-pulse (FB-CW), and depending on the CW radio-frequency (rf) field, either an insignificant sensitivity gain or an acquisition time-dependent gain and a low 13C resolution are obtained. In this study, we propose a new FB-pulse method in which radio frequency-driven recoupling (RFDR) is used as the 1H-13C decoupling scheme to overcome these drawbacks. The performances of FB-RFDR in terms of decoupling efficiency and sensitivity gain are tested on both natural abundance (NA) and uniformly 13C-15N labeled l-histidine·HCl·H2O (Hist) samples at a MAS frequency of νR = 70 kHz. The results show the superiority of RFDR over the CW decoupling with respect to these criteria. Importantly, they reveal that the sensitivity gain offered by FB-RFDR is nearly independent of the decoupling/acquisition duration. The application of FB-RFDR on NA-Hist and sucrose yields a sensitivity gain between 60 and 100% compared to conventional FB-CW and CPMAS-SPINAL experiments. Moreover, we compare the 13C sensitivities of NA-Hist obtained by our 1D FB-RFDR method and 2D 1H-{13C} double-CP acquisition. Both methods provide similar 13C sensitivity and are complementary. Indeed, the 2D method has the advantage of also providing the 1H-13C spatial proximities, but its sensitivity for quaternary carbons is limited; whereas our 1D FB-RFDR method is more independent of the type of carbon, and can provide a 13C 1D spectrum in a shorter experimental time. We also test the feasibility of FB-RFDR at a moderate frequency of νR = 20 kHz, but the experimental results demonstrate a poor resolution as well as a negligible sensitivity gain.
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Affiliation(s)
- Nghia Tuan Duong
- RIKEN-JEOL Collaboration Center, RIKEN, Yokohama, Kanagawa 230-0045, Japan
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Solvent production by engineered Ralstonia eutropha: channeling carbon to biofuel. Appl Microbiol Biotechnol 2018; 102:5021-5031. [DOI: 10.1007/s00253-018-9026-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 04/12/2018] [Accepted: 04/14/2018] [Indexed: 12/11/2022]
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Shen M, Wegner S, Trébosc J, Hu B, Lafon O, Amoureux JP. Minimizing the t 1-noise when using an indirect 1H high-resolution detection of unlabeled samples. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 87:111-116. [PMID: 28688541 DOI: 10.1016/j.ssnmr.2017.06.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 06/25/2017] [Accepted: 06/26/2017] [Indexed: 06/07/2023]
Abstract
The most utilized through-space correlation 1H-{X} methods with proton indirect detection use two consecutive transfers, 1H → X and then X → 1H, with the evolution time t1 in the middle. When the X isotope is not 100% naturally abundant (NA), only the signal of the protons close to these isotopes is modulated by the 1H-X dipolar interactions. This signal is theoretically disentangled with phase-cycling from the un-modulated one. However, this separation is never perfect and it may lead to t1-noise in case of isotopes with very small NA, such as 13C or even worse 15N. One way to reduce this t1-noise is to minimize, 'purge', during t1 the un-modulated 1H magnetization before trying to suppress it with phase-cycling. We analyze experimentally several sequences following the HORROR condition, which allow purging the 1H transverse magnetization. The comparison is made at three spinning speeds, including very fast ones for 1H resolution: 27.75, 55.5 and 111 kHz. We show (i) that the efficiency of this purging process increases with the spinning speed, and (ii) that the best recoupling sequences are the two simplest ones: XY and S1 = SR212. We then compare the S/N that can be achieved with the two most used 1H-{X} 2D methods, called D-HMQC and CP-CP. The only difference in between these two methods is that the transfers are done with either two π/2-pulses on X channel (D-HMQC), or two Cross-Polarization (CP) transfers (CP-CP). The first method, D-HMQC, is very robust and should be preferred when indirectly detecting nuclei with high NA. The second method, CP-CP, (i) requires experimental precautions to limit the t1-noise, and (ii) is difficult to use with quadrupolar nuclei because the two CP transfers are then not efficient nor robust. However, CP-CP is presently the best method to indirectly detect isotopes with small NA, such as 13C and 15N.
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Affiliation(s)
- M Shen
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, Shanghai 200062, PR China
| | - S Wegner
- Bruker BioSpin GmbH, 4 Silberstreifen, 76287 Rheinstetten, Germany
| | - J Trébosc
- Univ. Lille, UMR 8181, UCCS: Unit of Catalysis and Chemistry of Solids, 59000 Lille, France
| | - B Hu
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, Shanghai 200062, PR China
| | - O Lafon
- Univ. Lille, UMR 8181, UCCS: Unit of Catalysis and Chemistry of Solids, 59000 Lille, France; Institut Universitaire de France, 1 Rue Descartes, 75231 Paris, France
| | - J P Amoureux
- Univ. Lille, UMR 8181, UCCS: Unit of Catalysis and Chemistry of Solids, 59000 Lille, France; Bruker France, 34 Rue de l'Industrie, 67166 Wissembourg, France.
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Singh C, Rai RK, Kayastha AM, Sinha N. Ultra fast magic angle spinning solid - state NMR spectroscopy of intact bone. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2016; 54:132-135. [PMID: 26352739 DOI: 10.1002/mrc.4331] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Revised: 08/03/2015] [Accepted: 08/10/2015] [Indexed: 06/05/2023]
Abstract
Ultra fast magic angle spinning (MAS) has been a potent method to significantly average out homogeneous/inhomogeneous line broadening in solid-state nuclear magnetic resonance (ssNMR) spectroscopy. It has given a new direction to ssNMR spectroscopy with its different applications. We present here the first and foremost application of ultra fast MAS (~60 kHz) for ssNMR spectroscopy of intact bone. This methodology helps to comprehend and elucidate the organic content in the intact bone matrix with resolution and sensitivity enhancement. At this MAS speed, amino protons from organic part of intact bone start to appear in (1) H NMR spectra. The experimental protocol of ultra-high speed MAS for intact bone has been entailed with an additional insight achieved at 60 kHz.
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Affiliation(s)
- Chandan Singh
- Centre of Biomedical Research, SGPGIMS Campus, Raebarelly Road, Lucknow, UP, 226014, India
- School of Biotechnology, Faculty of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Ratan Kumar Rai
- Centre of Biomedical Research, SGPGIMS Campus, Raebarelly Road, Lucknow, UP, 226014, India
| | - Arvind M Kayastha
- School of Biotechnology, Faculty of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Neeraj Sinha
- Centre of Biomedical Research, SGPGIMS Campus, Raebarelly Road, Lucknow, UP, 226014, India
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