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Gillard M, Piraux G, Daenen M, Abraham M, Troian‐Gautier L, Bar L, Bonnet H, Loiseau F, Jamet H, Dejeu J, Defrancq E, Elias B. Photo‐Oxidizing Ruthenium(II) Complexes with Enhanced Visible‐Light Absorption and G‐quadruplex DNA Binding Abilities. Chemistry 2022; 28:e202202251. [DOI: 10.1002/chem.202202251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Indexed: 11/06/2022]
Affiliation(s)
- Martin Gillard
- Université catholique de Louvain (UCLouvain) Institut de la Matière Condensée et des Nanosciences (IMCN) Molecular Chemistry, Materials and Catalysis (MOST) Place Louis Pasteur 1, bte L4.01.02 1348 Louvain-la-Neuve Belgium
| | - Guillaume Piraux
- Université catholique de Louvain (UCLouvain) Institut de la Matière Condensée et des Nanosciences (IMCN) Molecular Chemistry, Materials and Catalysis (MOST) Place Louis Pasteur 1, bte L4.01.02 1348 Louvain-la-Neuve Belgium
| | - Martin Daenen
- Université catholique de Louvain (UCLouvain) Institut de la Matière Condensée et des Nanosciences (IMCN) Molecular Chemistry, Materials and Catalysis (MOST) Place Louis Pasteur 1, bte L4.01.02 1348 Louvain-la-Neuve Belgium
| | - Michaël Abraham
- Université catholique de Louvain (UCLouvain) Institut de la Matière Condensée et des Nanosciences (IMCN) Molecular Chemistry, Materials and Catalysis (MOST) Place Louis Pasteur 1, bte L4.01.02 1348 Louvain-la-Neuve Belgium
| | - Ludovic Troian‐Gautier
- Université catholique de Louvain (UCLouvain) Institut de la Matière Condensée et des Nanosciences (IMCN) Molecular Chemistry, Materials and Catalysis (MOST) Place Louis Pasteur 1, bte L4.01.02 1348 Louvain-la-Neuve Belgium
| | - Laure Bar
- Université Grenoble Alpes (UGA) Département de Chimie Moléculaire, UMR CNRS 5250 CS 40700 - 38058 Grenoble France)
| | - Hugues Bonnet
- Université Grenoble Alpes (UGA) Département de Chimie Moléculaire, UMR CNRS 5250 CS 40700 - 38058 Grenoble France)
| | - Frédérique Loiseau
- Université Grenoble Alpes (UGA) Département de Chimie Moléculaire, UMR CNRS 5250 CS 40700 - 38058 Grenoble France)
| | - Hélène Jamet
- Université Grenoble Alpes (UGA) Département de Chimie Moléculaire, UMR CNRS 5250 CS 40700 - 38058 Grenoble France)
| | - Jérôme Dejeu
- Université Grenoble Alpes (UGA) Département de Chimie Moléculaire, UMR CNRS 5250 CS 40700 - 38058 Grenoble France)
| | - Eric Defrancq
- Université Grenoble Alpes (UGA) Département de Chimie Moléculaire, UMR CNRS 5250 CS 40700 - 38058 Grenoble France)
| | - Benjamin Elias
- Université catholique de Louvain (UCLouvain) Institut de la Matière Condensée et des Nanosciences (IMCN) Molecular Chemistry, Materials and Catalysis (MOST) Place Louis Pasteur 1, bte L4.01.02 1348 Louvain-la-Neuve Belgium
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2
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Boota RZ, Hardman SJO, Ashton GP, Rice CR, Scattergood PA, Elliott PIP. Photochemistry of Heteroleptic 1,4,5,8-Tetraazaphenanthrene- and Bi-1,2,3-triazolyl-Containing Ruthenium(II) Complexes. Inorg Chem 2021; 60:15768-15781. [PMID: 34612633 DOI: 10.1021/acs.inorgchem.1c02441] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Diimine metal complexes have significant relevance in the development of photodynamic therapy (PDT) and photoactivated chemotherapy (PACT) applications. In particular, complexes of the TAP ligand (1,4,5,8-tetraazaphenanthrene) are known to lead to photoinduced oxidation of DNA, while TAP- and triazole-based complexes are also known to undergo photochemical ligand release processes relevant to PACT. The photophysical and photochemical properties of heteroleptic complexes [Ru(TAP)n(btz)3-n]2+ (btz = 1,1'-dibenzyl-4,4'-bi-1,2,3-triazolyl, n = 1 (1), 2 (2)) have been explored. Upon irradiation in acetonitrile, 1 displays analogous photochemistry to that previously observed for [Ru(bpy)(btz)2]2+ (bpy = 2,2'-bipyridyl) and generates trans-[Ru(TAP)(btz)(NCMe)2]2+ (5), which has been crystallographically characterized, with the observation of the ligand-loss intermediate trans-[Ru(TAP)(κ2-btz)(κ1-btz)(NCMe)]2+ (4). Complex 2 displays more complicated photochemical behavior with not only preferential photorelease of btz to form cis-[Ru(TAP)2(NCMe)2]2+ (6) but also competitive photorelease of TAP to form 5. Free TAP is then taken up by 6 to form [Ru(TAP)3]2+ (3) with the proportion of 5 and 3 observed to progressively increase during prolonged photolysis. Data suggest a complex set of reversible photochemical ligand scrambling processes in which 2 and 3 are interconverted. Computational DFT calculations have enabled optimization of geometries of the pro-trans 3MCcis states with repelled btz or TAP ligands crucial for the formation of 5 from 1 and 2, respectively, lending weight to recent evidence that such 3MCcis states play an important mechanistic role in the rich photoreactivity of Ru(II) diimine complexes.
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Affiliation(s)
- Rayhaan Z Boota
- Department of Chemistry, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, U.K
| | - Samantha J O Hardman
- Manchester Institute of Biotechnology, The University of Manchester, 131 Princess Street, Manchester M1 7DN, U.K
| | - Gage P Ashton
- Department of Chemistry, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, U.K
| | - Craig R Rice
- Department of Chemistry, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, U.K
| | - Paul A Scattergood
- Department of Chemistry, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, U.K
| | - Paul I P Elliott
- Department of Chemistry, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, U.K
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3
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Zenkov IS, Yakushev AA, Abel AS, Averin AD, Bessmertnykh-Lemeune AG, Beletskaya IP. Photocatalytic Activity of Ruthenium(II) Complex with 1,10-Phenanthroline-3,8-dicarboxylic Acid in Aerobic Oxidation Reactions. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2021. [DOI: 10.1134/s1070428021090025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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4
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Shum J, Leung PKK, Lo KKW. Luminescent Ruthenium(II) Polypyridine Complexes for a Wide Variety of Biomolecular and Cellular Applications. Inorg Chem 2019; 58:2231-2247. [DOI: 10.1021/acs.inorgchem.8b02979] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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5
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Halse ME, Procacci B, Perutz RN, Duckett SB. Towards measuring reactivity on micro-to-millisecond timescales with laser pump, NMR probe spectroscopy. Faraday Discuss 2019; 220:28-44. [DOI: 10.1039/c9fd00039a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
We present a quantitative analysis of the timescales of reactivity that are accessible to a laser pump, NMR probe spectroscopy method using para-hydrogen induced polarisation (PHIP) and identify three kinetic regimes: fast, intermediate and slow.
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Affiliation(s)
| | - Barbara Procacci
- Centre for Hyperpolarisation in Magnetic Resonance
- Department of Chemistry
- University of York
- York
- UK
| | | | - Simon B. Duckett
- Centre for Hyperpolarisation in Magnetic Resonance
- Department of Chemistry
- University of York
- York
- UK
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6
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Keane PM, Tory J, Towrie M, Sazanovich IV, Cardin CJ, Quinn SJ, Hartl F, Kelly JM, Long C. Spectro-electrochemical Studies on [Ru(TAP) 2(dppz)] 2+-Insights into the Mechanism of its Photosensitized Oxidation of Oligonucleotides. Inorg Chem 2018; 58:663-671. [PMID: 30540448 DOI: 10.1021/acs.inorgchem.8b02859] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[Ru(TAP)2(dppz)]2+ (TAP = 1,4,5,8-tetraazaphenanthrene; dppz = dipyrido[3,2- a:2',3'- c]phenazine) is known to photo-oxidize guanine in DNA. Whether this oxidation proceeds by direct photoelectron transfer or by proton-coupled electron transfer is still unknown. To help distinguish between these mechanisms, spectro-electrochemical experiments have been carried out with [Ru(TAP)2(dppz)]2+ in acetonitrile. The UV-vis and mid-IR spectra obtained for the one-electron reduced product were compared to those obtained by picosecond transient absorption and time-resolved infrared experiments of [Ru(TAP)2(dppz)]2+ bound to guanine-containing DNA. An interesting feature of the singly reduced species is an electronic transition in the near-IR region (with λmax at 1970 and 2820 nm). Density functional and time-dependent density functional theory simulations of the vibrational and electronic spectra of [Ru(TAP)2(dppz)]2+, the reduced complex [Ru(TAP)2(dppz)]+, and four isomers of [Ru(TAP)(TAPH)(dppz)]2+ (a possible product of proton-coupled electron transfer) were performed. Significantly, these predict absorption bands at λ > 1900 nm (attributed to a ligand-to-metal charge-transfer transition) for [Ru(TAP)2(dppz)]+ but not for [Ru(TAP)(TAPH)(dppz)]2+. Both the UV-vis and mid-IR difference absorption spectra of the electrochemically generated singly reduced species [Ru(TAP)2(dppz)]+ agree well with the transient absorption and time-resolved infrared spectra previously determined for the transient species formed by photoexcitation of [Ru(TAP)2(dppz)]2+ intercalated in guanine-containing DNA. This suggests that the photochemical process in DNA proceeds by photoelectron transfer and not by a proton-coupled electron transfer process involving formation of [Ru(TAP)(TAPH)(dppz)]2+, as is proposed for the reaction with 5'-guanosine monophosphate. Additional infrared spectro-electrochemical measurements and density functional calculations have also been carried out on the free TAP ligand. These show that the TAP radical anion in acetonitrile also exhibits strong broad near-IR electronic absorption (λmax at 1750 and 2360 nm).
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Affiliation(s)
- Páraic M Keane
- School of Chemistry , University of Dublin, Trinity College , Dublin 2 , Ireland.,Department of Chemistry , University of Reading , Whiteknights, Reading RG6 6AD , United Kingdom
| | - Joanne Tory
- Department of Chemistry , University of Reading , Whiteknights, Reading RG6 6AD , United Kingdom
| | - Michael Towrie
- Science and Technology Facilities Council , Rutherford Appleton Laboratory, Research Complex at Harwell , Didcot, Oxfordshire OX11 0QX , United Kingdom
| | - Igor V Sazanovich
- Science and Technology Facilities Council , Rutherford Appleton Laboratory, Research Complex at Harwell , Didcot, Oxfordshire OX11 0QX , United Kingdom
| | - Christine J Cardin
- Department of Chemistry , University of Reading , Whiteknights, Reading RG6 6AD , United Kingdom
| | - Susan J Quinn
- School of Chemistry , University College Dublin , Belfield, Dublin 4 , Ireland
| | - František Hartl
- Department of Chemistry , University of Reading , Whiteknights, Reading RG6 6AD , United Kingdom
| | - John M Kelly
- School of Chemistry , University of Dublin, Trinity College , Dublin 2 , Ireland
| | - Conor Long
- School of Chemical Sciences , Dublin City University , Dublin 9 , Ireland
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7
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Mompeán M, Sánchez-Donoso RM, de la Hoz A, Saggiomo V, Velders AH, Gomez MV. Pushing nuclear magnetic resonance sensitivity limits with microfluidics and photo-chemically induced dynamic nuclear polarization. Nat Commun 2018; 9:108. [PMID: 29317665 PMCID: PMC5760532 DOI: 10.1038/s41467-017-02575-0] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 12/11/2017] [Indexed: 12/03/2022] Open
Abstract
Among the methods to enhance the sensitivity of nuclear magnetic resonance (NMR) spectroscopy, small-diameter NMR coils (microcoils) are promising tools to tackle the study of mass-limited samples. Alternatively, hyperpolarization schemes based on dynamic nuclear polarization techniques provide strong signal enhancements of the NMR target samples. Here we present a method to effortlessly perform photo-chemically induced dynamic nuclear polarization in microcoil setups to boost NMR signal detection down to sub-picomole detection limits in a 9.4T system (400 MHz 1H Larmor frequency). This setup is unaffected by current major drawbacks such as the use of high-power light sources to attempt uniform irradiation of the sample, and accumulation of degraded photosensitizer in the detection region. The latter is overcome with flow conditions, which in turn open avenues for complex applications requiring rapid and efficient mixing that are not easily achievable on an NMR tube without resorting to complex hardware. Nuclear magnetic resonance (NMR) spectroscopy is a powerful technique with an inherently low sensitivity. Here, the authors present a combination of microcoils with photo-chemically induced dynamic nuclear polarization to boost NMR sensitivity down to sub-picomole detection limits.
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Affiliation(s)
- Miguel Mompeán
- Instituto Regional de Investigación Científica Aplicada (UCLM), Avda Camilo José Cela s/n, 13071, Ciudad Real, Spain
| | - Rosa M Sánchez-Donoso
- Instituto Regional de Investigación Científica Aplicada (UCLM), Avda Camilo José Cela s/n, 13071, Ciudad Real, Spain.,Laboratory of BioNanoTechnology, Wageningen University, PO Box 8038, 6700, EK Wageningen, The Netherlands
| | - Antonio de la Hoz
- Instituto Regional de Investigación Científica Aplicada (UCLM), Avda Camilo José Cela s/n, 13071, Ciudad Real, Spain
| | - Vittorio Saggiomo
- Laboratory of BioNanoTechnology, Wageningen University, PO Box 8038, 6700, EK Wageningen, The Netherlands
| | - Aldrik H Velders
- Instituto Regional de Investigación Científica Aplicada (UCLM), Avda Camilo José Cela s/n, 13071, Ciudad Real, Spain. .,Laboratory of BioNanoTechnology, Wageningen University, PO Box 8038, 6700, EK Wageningen, The Netherlands. .,MAGNEtic resonance research FacilitY-MAGNEFY, Wageningen University & Research, PO Box 8038, 6700, EK Wageningen, The Netherlands.
| | - M Victoria Gomez
- Instituto Regional de Investigación Científica Aplicada (UCLM), Avda Camilo José Cela s/n, 13071, Ciudad Real, Spain
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8
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Troian-Gautier L, Mugeniwabagara E, Fusaro L, Cauët E, Kirsch-De Mesmaeker A, Luhmer M. Photo-CIDNP Reveals Different Protonation Sites Depending on the Primary Step of the Photoinduced Electron-/Proton-Transfer Process with Ru(II) Polyazaaromatic Complexes. J Am Chem Soc 2017; 139:14909-14912. [DOI: 10.1021/jacs.7b09513] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ludovic Troian-Gautier
- Laboratoire
de Chimie Organique et Photochimie (CP 160/08), ‡Laboratoire de Résonance
Magnétique Nucléaire Haute Résolution (CP 160/08), and §Service de Chimie
Quantique et Photophysique (CP 160/09), Université libre de Bruxelles, 50 av. F. D. Roosevelt, B-1050 Brussels, Belgium
| | - Epiphanie Mugeniwabagara
- Laboratoire
de Chimie Organique et Photochimie (CP 160/08), ‡Laboratoire de Résonance
Magnétique Nucléaire Haute Résolution (CP 160/08), and §Service de Chimie
Quantique et Photophysique (CP 160/09), Université libre de Bruxelles, 50 av. F. D. Roosevelt, B-1050 Brussels, Belgium
| | - Luca Fusaro
- Laboratoire
de Chimie Organique et Photochimie (CP 160/08), ‡Laboratoire de Résonance
Magnétique Nucléaire Haute Résolution (CP 160/08), and §Service de Chimie
Quantique et Photophysique (CP 160/09), Université libre de Bruxelles, 50 av. F. D. Roosevelt, B-1050 Brussels, Belgium
| | - Emilie Cauët
- Laboratoire
de Chimie Organique et Photochimie (CP 160/08), ‡Laboratoire de Résonance
Magnétique Nucléaire Haute Résolution (CP 160/08), and §Service de Chimie
Quantique et Photophysique (CP 160/09), Université libre de Bruxelles, 50 av. F. D. Roosevelt, B-1050 Brussels, Belgium
| | - Andrée Kirsch-De Mesmaeker
- Laboratoire
de Chimie Organique et Photochimie (CP 160/08), ‡Laboratoire de Résonance
Magnétique Nucléaire Haute Résolution (CP 160/08), and §Service de Chimie
Quantique et Photophysique (CP 160/09), Université libre de Bruxelles, 50 av. F. D. Roosevelt, B-1050 Brussels, Belgium
| | - Michel Luhmer
- Laboratoire
de Chimie Organique et Photochimie (CP 160/08), ‡Laboratoire de Résonance
Magnétique Nucléaire Haute Résolution (CP 160/08), and §Service de Chimie
Quantique et Photophysique (CP 160/09), Université libre de Bruxelles, 50 av. F. D. Roosevelt, B-1050 Brussels, Belgium
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9
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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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10
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Troian-Gautier L, Mugeniwabagara E, Fusaro L, Moucheron C, Kirsch-De Mesmaeker A, Luhmer M. pH Dependence of Photoinduced Electron Transfer with [Ru(TAP)3]2+. Inorg Chem 2016; 56:1794-1803. [DOI: 10.1021/acs.inorgchem.6b01780] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ludovic Troian-Gautier
- Laboratoire
de Chimie Organique et Photochimie and §Laboratoire de Résonance Magnétique
Nucléaire Haute Résolution, Université libre de Bruxelles, 50 av. F. D. Roosevelt, CP160/08, B-1050 Bruxelles, Belgium
| | - Epiphanie Mugeniwabagara
- Laboratoire
de Chimie Organique et Photochimie and §Laboratoire de Résonance Magnétique
Nucléaire Haute Résolution, Université libre de Bruxelles, 50 av. F. D. Roosevelt, CP160/08, B-1050 Bruxelles, Belgium
| | - Luca Fusaro
- Laboratoire
de Chimie Organique et Photochimie and §Laboratoire de Résonance Magnétique
Nucléaire Haute Résolution, Université libre de Bruxelles, 50 av. F. D. Roosevelt, CP160/08, B-1050 Bruxelles, Belgium
| | - Cécile Moucheron
- Laboratoire
de Chimie Organique et Photochimie and §Laboratoire de Résonance Magnétique
Nucléaire Haute Résolution, Université libre de Bruxelles, 50 av. F. D. Roosevelt, CP160/08, B-1050 Bruxelles, Belgium
| | - Andrée Kirsch-De Mesmaeker
- Laboratoire
de Chimie Organique et Photochimie and §Laboratoire de Résonance Magnétique
Nucléaire Haute Résolution, Université libre de Bruxelles, 50 av. F. D. Roosevelt, CP160/08, B-1050 Bruxelles, Belgium
| | - Michel Luhmer
- Laboratoire
de Chimie Organique et Photochimie and §Laboratoire de Résonance Magnétique
Nucléaire Haute Résolution, Université libre de Bruxelles, 50 av. F. D. Roosevelt, CP160/08, B-1050 Bruxelles, Belgium
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11
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Procacci B, Aguiar PM, Halse ME, Perutz RN, Duckett SB. Photochemical pump and NMR probe to monitor the formation and kinetics of hyperpolarized metal dihydrides. Chem Sci 2016; 7:7087-7093. [PMID: 28451144 PMCID: PMC5363785 DOI: 10.1039/c6sc01956k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 08/03/2016] [Indexed: 12/22/2022] Open
Abstract
Pulsed-laser experiments validate photochemical pump-NMR probe spectroscopy for monitoring the rate of rapid H2 oxidative addition to a metal centre.
On reaction of IrI(CO)(PPh3)21 with para-hydrogen (p-H2), Ir(H)2I(CO)(PPh3)22 is formed which exhibits strongly enhanced 1H NMR signals for its hydride resonances. Complex 2 also shows similar enhancement of its NMR spectra when it is irradiated under p-H2. We report the use of this photochemical reactivity to measure the kinetics of H2 addition by laser-synchronized reactions in conjunction with NMR. The single laser pulse promotes the reductive elimination of H2 from Ir(H)2I(CO)(PPh3)22 in C6D6 solution to form the 16-electron precursor 1, back reaction with p-H2 then reforms 2 in a well-defined nuclear spin-state. The build up of this product can be followed by incrementing a precisely controlled delay (τ), in millisecond steps, between the laser and the NMR pulse. The resulting signal vs. time profile shows a dependence on p-H2 pressure. The plot of kobs against p-H2 pressure is linear and yields the second order rate constant, k2, for H2 addition to 1 of (3.26 ± 0.42) × 102 M–1 s–1. Validation was achieved by transient-UV-vis absorption spectroscopy which gives k2 of (3.06 ± 0.40) × 102 M–1 s–1. Furthermore, irradiation of a C6D6 solution of 2 with multiple laser shots, in conjunction with p-H2 derived hyperpolarization, allows the detection and characterisation of two minor reaction products, 2a and 3, which are produced in such low yields that they are not detected without hyperpolarization. Complex 2a is a configurational isomer of 2, while 3 is formed by substitution of CO by PPh3.
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Affiliation(s)
- 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 .
| | - Pedro M Aguiar
- Department of Chemistry , University of York , Heslington , York YO10 5DD , UK .
| | - 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 .
| | - 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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12
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Mishra A, Sahu S, Tripathi S, Krishnamoorthy G. Photoinduced intramolecular charge transfer in trans-2-[4'-(N,N-dimethylamino)styryl]imidazo[4,5-b]pyridine: effect of introducing a C[double bond, length as m-dash]C double bond. Photochem Photobiol Sci 2015; 13:1476-86. [PMID: 25103414 DOI: 10.1039/c4pp00237g] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The spectral characteristics of trans-2-[4'-(N,N-dimethylamino)styryl]imidazo[4,5-b]pyridine (t-DMASIP-b) have been investigated using absorption and fluorescence techniques, and compared with 2-(4'-N,N-dimethylamino)imidazo[4,5-b]pyridine (DMAPIP-b). The study reveals that introduction of a C[double bond, length as m-dash]C double bond strongly perturbs the photophysics of the system. Unlike DMAPIP-b, t-DMASIP-b emits a single emission in aprotic and protic solvents. The emission occurs from the locally excited state in nonpolar solvents and from a planar intramolecular charge transfer (PICT) state in polar solvents. Multiple linear regression analysis suggests that among the different solvent parameters, the dipolar interaction contributes more to the stabilization of the system in both the ground and excited states. Theoretical calculations suggest that, unlike in DMAPIP-b, proton coupled twisted intramolecular charge transfer (TICT) emission does not occur in t-DMASIP-b. The higher quantum yield obtained in the viscous solvent glycerol is attributed to the restriction of the twisting of the olefinic bond. The photoirradiation of t-DMASIP-b shows that isomerization takes place in all solvents, including viscous glycerol. The theoretically simulated potential energy surface shows that isomerization occurs via a phantom state, which is a nonradiative process. The rise in temperature favors the photoisomerization, thus, the fluorescence quantum yield decreases. The prototropic study indicates that, unlike in DMAPIP-b, the protonation takes place at different places to form the monocations.
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Affiliation(s)
- Anasuya Mishra
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India.
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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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14
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Adonin SA, Abramov PA, Uskov SI. Crystal structure of Ir(III) complexes with 1,10-phenanthroline: K[Ir(phen)Cl4]·H2O and (Me4N)[Ir(phen)Cl4]. J STRUCT CHEM+ 2014. [DOI: 10.1134/s0022476614030184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Marcélis L, Ghesquière J, Garnir K, Kirsch-De Mesmaeker A, Moucheron C. Photo-oxidizing RuII complexes and light: Targeting biomolecules via photoadditions. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2012.02.012] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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16
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Cauët E, Carette T, Lauzin C, Li JG, Loreau J, Delsaut M, Nazé C, Verdebout S, Vranckx S, Godefroid M, Liévin J, Vaeck N. From atoms to biomolecules: a fruitful perspective. Theor Chem Acc 2012. [DOI: 10.1007/s00214-012-1254-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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17
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Goez M. Elucidating organic reaction mechanisms using photo-CIDNP spectroscopy. Top Curr Chem (Cham) 2012; 338:1-32. [PMID: 22911487 DOI: 10.1007/128_2012_348] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
CIDNP (chemically induced dynamic nuclear polarization) arises in radical pairs or biradicals but is detected in the diamagnetic reaction products. Hence, it can be used not only to identify and characterize both types of species but also to establish the pathways connecting precursors, paramagnetic intermediates and products, and to employ the polarizations as labels to individual nuclei. Recent applications of CIDNP to elucidate the mechanisms of photochemical reactions are reviewed, which illustrate all these facets.
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Affiliation(s)
- Martin Goez
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, Kurt-Mothes-Str. 2, 06120, Halle/Saale, Germany,
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18
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Kan J, Chen Y, Gao J, Wan L, Lei T, Ma P, Jiang J. Synthesis, self-assembly, and semiconducting properties of phenanthroline-fused phthalocyanine derivatives. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm32358c] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Transient spectroscopy of dipyridophenazine metal complexes which undergo photo-induced electron transfer with DNA. Coord Chem Rev 2011. [DOI: 10.1016/j.ccr.2011.04.007] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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20
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Nasr G, Guerlin A, Dumur F, Baudron SA, Dumas E, Miomandre F, Clavier G, Sliwa M, Mayer CR. Dithiolate-Appended Iridium(III) Complex with Dual Functions of Reducing and Capping Agent for the Design of Small-Sized Gold Nanoparticles. J Am Chem Soc 2011; 133:6501-4. [DOI: 10.1021/ja111384m] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Gihane Nasr
- Institut Lavoisier de Versailles, Université de Versailles Saint-Quentin en Yvelines, UMR 8180 CNRS, 78035 Versailles, France
| | - Audrey Guerlin
- Institut Lavoisier de Versailles, Université de Versailles Saint-Quentin en Yvelines, UMR 8180 CNRS, 78035 Versailles, France
- Institut d'Alembert, IFR 121, Ecole Normale Supérieure de Cachan, 94235 Cachan, France
| | - Frédéric Dumur
- Laboratoire Chimie Provence, équipe CROPS, UMR 6264 CNRS, Universités d’Aix-Marseille I, II, III, 13397 Marseille, France
| | - Stéphane A. Baudron
- Laboratoire de Chimie de Coordination Organique, Université de Strasbourg, UMR 7140 CNRS, 67000 Strasbourg, France
| | - Eddy Dumas
- Institut Lavoisier de Versailles, Université de Versailles Saint-Quentin en Yvelines, UMR 8180 CNRS, 78035 Versailles, France
| | - Fabien Miomandre
- Institut d'Alembert, IFR 121, Ecole Normale Supérieure de Cachan, 94235 Cachan, France
| | - Gilles Clavier
- Institut d'Alembert, IFR 121, Ecole Normale Supérieure de Cachan, 94235 Cachan, France
| | - Michel Sliwa
- Laboratoire de Spectrochimie Infrarouge et Raman, UMR-CNRS 8516, Université Lille Nord de France, Université Lille 1 Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq, France
| | - Cédric R. Mayer
- Institut Lavoisier de Versailles, Université de Versailles Saint-Quentin en Yvelines, UMR 8180 CNRS, 78035 Versailles, France
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Cauët E, Bogatko S, Mugeniwabagara E, Fusaro L, Kirsch-De Mesmaeker A, Luhmer M, Vaeck N. Density Functional Theory Interpretation of the 1H Photo-Chemically Induced Dynamic Nuclear Polarization Enhancements Characterizing Photoreduced Polyazaaromatic Ru(II) Coordination Complexes. Inorg Chem 2010; 49:7826-31. [DOI: 10.1021/ic100636j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Emilie Cauët
- Service de Chimie Quantique et Photophysique, CP 160/09
| | | | | | - Luca Fusaro
- Laboratoire de Résonance Magnétique Nucléaire Haute Résolution, CP 160/08
| | | | - Michel Luhmer
- Laboratoire de Résonance Magnétique Nucléaire Haute Résolution, CP 160/08
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22
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A RuII-TAP Complex, Photoreagent for Tryptophan-Containing Peptides: Structure of the Covalent Photoadduct. Inorg Chem 2010; 49:6796-8. [DOI: 10.1021/ic101151e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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23
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Crespy D, Landfester K, Schubert US, Schiller A. Potential photoactivated metallopharmaceuticals: from active molecules to supported drugs. Chem Commun (Camb) 2010; 46:6651-62. [DOI: 10.1039/c0cc01887b] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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