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Halse ME, Procacci B, Henshaw SL, Perutz RN, Duckett SB. Coherent evolution of parahydrogen induced polarisation using laser pump, NMR probe spectroscopy: Theoretical framework and experimental observation. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2017; 278:25-38. [PMID: 28347906 DOI: 10.1016/j.jmr.2017.03.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 03/07/2017] [Accepted: 03/08/2017] [Indexed: 06/06/2023]
Abstract
We recently reported a pump-probe method that uses a single laser pulse to introduce parahydrogen (p-H2) into a metal dihydride complex and then follows the time-evolution of the p-H2-derived nuclear spin states by NMR. We present here a theoretical framework to describe the oscillatory behaviour of the resultant hyperpolarised NMR signals using a product operator formalism. We consider the cases where the p-H2-derived protons form part of an AX, AXY, AXYZ or AA'XX' spin system in the product molecule. We use this framework to predict the patterns for 2D pump-probe NMR spectra, where the indirect dimension represents the evolution during the pump-probe delay and the positions of the cross-peaks depend on the difference in chemical shift of the p-H2-derived protons and the difference in their couplings to other nuclei. The evolution of the NMR signals of the p-H2-derived protons, as well as the transfer of hyperpolarisation to other NMR-active nuclei in the product, is described. The theoretical framework is tested experimentally for a set of ruthenium dihydride complexes representing the different spin systems. Theoretical predictions and experimental results agree to within experimental error for all features of the hyperpolarised 1H and 31P pump-probe NMR spectra. Thus we establish the laser pump, NMR probe approach as a robust way to directly observe and quantitatively analyse the coherent evolution of p-H2-derived spin order over micro-to-millisecond timescales.
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Affiliation(s)
- Meghan E Halse
- Centre for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, York Science Park, University of York, Heslington, York YO10 5NY, UK; Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Barbara Procacci
- Centre for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, York Science Park, University of York, Heslington, York YO10 5NY, UK; Department of Chemistry, University of York, Heslington, York YO10 5DD, UK
| | - Sarah-Louise Henshaw
- Centre for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, York Science Park, University of York, Heslington, York YO10 5NY, UK; Department of Chemistry, University of York, Heslington, York YO10 5DD, UK
| | - Robin N Perutz
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
| | - Simon B Duckett
- Centre for Hyperpolarisation in Magnetic Resonance, Department of Chemistry, York Science Park, University of York, Heslington, York YO10 5NY, UK; Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
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Sandhya KS, Suresh CH. Quantification of Thermodynamic Hydridicity of Hydride Complexes of Mn, Re, Mo, and W Using the Molecular Electrostatic Potential. J Phys Chem A 2017; 121:2814-2819. [DOI: 10.1021/acs.jpca.6b12271] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- K. S. Sandhya
- Inorganic and Theoretical
Chemistry Section, CSTD, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, India
| | - Cherumuttathu H. Suresh
- Inorganic and Theoretical
Chemistry Section, CSTD, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, India
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3
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Affiliation(s)
- Robin N. Perutz
- Department of Chemistry, University of York, York YO10 5DD, United Kingdom
| | - Barbara Procacci
- Department of Chemistry, University of York, York YO10 5DD, United Kingdom
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Torres O, Procacci B, Halse ME, Adams RW, Blazina D, Duckett SB, Eguillor B, Green RA, Perutz RN, Williamson DC. Photochemical Pump and NMR Probe: Chemically Created NMR Coherence on a Microsecond Time Scale. J Am Chem Soc 2014; 136:10124-31. [DOI: 10.1021/ja504732u] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Olga Torres
- Department
of Chemistry, University of York, Heslington, York YO10
5DD, U.K
| | - Barbara Procacci
- Department
of Chemistry, University of York, Heslington, York YO10
5DD, U.K
| | - Meghan E. Halse
- Department
of Chemistry, University of York, Heslington, York YO10
5DD, U.K
| | - Ralph W. Adams
- Department
of Chemistry, University of York, Heslington, York YO10
5DD, U.K
| | - Damir Blazina
- Department
of Chemistry, University of York, Heslington, York YO10
5DD, U.K
| | - Simon B. Duckett
- Department
of Chemistry, University of York, Heslington, York YO10
5DD, U.K
| | - Beatriz Eguillor
- Department
of Chemistry, University of York, Heslington, York YO10
5DD, U.K
| | - Richard A. Green
- Department
of Chemistry, University of York, Heslington, York YO10
5DD, U.K
| | - Robin N. Perutz
- Department
of Chemistry, University of York, Heslington, York YO10
5DD, U.K
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Lloyd LS, Asghar A, Burns MJ, Charlton A, Coombes S, Cowley MJ, Dear GJ, Duckett SB, Genov GR, Green GGR, Highton LAR, Hooper AJJ, Khan M, Khazal IG, Lewis RJ, Mewis RE, Roberts AD, Ruddlesden AJ. Hyperpolarisation through reversible interactions with parahydrogen. Catal Sci Technol 2014. [DOI: 10.1039/c4cy00464g] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ir(COD)(NHC)Cl complexes provide significant insight into the catalytic processes underpinning SABRE hyperpolarization.
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Affiliation(s)
- Lyrelle S. Lloyd
- Centre for Hyperpolarization in Magnetic Resonance
- University of York
- York, UK
| | - Aziz Asghar
- Hull York Medical School
- University of Hull
- Hull, UK
| | - Michael J. Burns
- Centre for Hyperpolarization in Magnetic Resonance
- University of York
- York, UK
| | | | - Steven Coombes
- AstraZeneca R&D Pharmaceutical Development
- Macclesfield, UK
| | - Michael J. Cowley
- Centre for Hyperpolarization in Magnetic Resonance
- University of York
- York, UK
| | | | - Simon B. Duckett
- Centre for Hyperpolarization in Magnetic Resonance
- University of York
- York, UK
| | - Georgi R. Genov
- Centre for Hyperpolarization in Magnetic Resonance
- University of York
- York, UK
| | - Gary G. R. Green
- Centre for Hyperpolarization in Magnetic Resonance
- University of York
- York, UK
| | | | | | - Majid Khan
- Centre for Hyperpolarization in Magnetic Resonance
- University of York
- York, UK
| | - Iman G. Khazal
- Centre for Hyperpolarization in Magnetic Resonance
- University of York
- York, UK
| | - Richard. J. Lewis
- AstraZeneca R&D Mölndal
- Respiratory & Inflammation Innovative Medicines
- , Sweden
| | - Ryan E. Mewis
- Centre for Hyperpolarization in Magnetic Resonance
- University of York
- York, UK
| | | | - Amy J. Ruddlesden
- Centre for Hyperpolarization in Magnetic Resonance
- University of York
- York, UK
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Kozinets EM, Fekete M, Filippov OA, Belkova NV, Shubina ES, Poli R, Duckett SB, Manoury E. Activation of a (cyclooctadiene) rhodium(I) complex supported by a chiral ferrocenyl phosphine thioether ligand for hydrogenation catalysis: a combined parahydrogen NMR and DFT study. Dalton Trans 2013; 42:11720-30. [PMID: 23851567 DOI: 10.1039/c3dt51429c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of [RhCl(P,S(t)Bu)(COD)] (1) or [Rh(P,S(t)Bu)(COD)]BF4 (2) where (P,S(t)Bu) is CpFe[η(5)-1,2-C5H3(PPh2)(CH2S(t)Bu)] with H2 in MeOH gives rise to COD hydrogenation and formation of a solvent-stabilized product. The formation of hydride species cannot be observed in view of a very rapid H/D exchange between H2 and the solvent. Introduction of pyridine or acetonitrile slows down this exchange process and allows observation of diastereometric dihydride complexes, [Rh(P,S(t)Bu)(H)2(L)2](+), the stereochemistry of which was fully elucidated. The hydride site exchange rates have been derived from EXSY NMR experiments and used, with assistance from DFT calculation, to elucidate the isomerization and site exchange mechanisms.
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