Journal ArticleDOI
Excited-state quenching by proton-coupled electron transfer
Javier J. Concepcion,M. Kyle Brennaman,Jeremy R. Deyton,Natalia V. Lebedeva,Malcolm D. E. Forbes,John M. Papanikolas,Thomas J. Meyer +6 more
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TLDR
The protonated, reduced complex [Ru(bpy)2(bpzH•)]2+ functions as a H-atom reductant toward quinone or benzaldehyde with potential implications for net photochemistry and energy conversion.Abstract:
The emitting metal-to-ligand charge transfer (MLCT) excited state of [Ru(bpy)2(bpz)]2+ (bpy is 2,2‘-bipyridine; bpz is 2,2‘-bipyrazine) is reductively quenched by hydroquinone (H2Q) by proton-coupled electron transfer (PCET), most likely by concerted electron−proton transfer (EPT). The identity of the transient products ([Ru(bpy)2(bpzH•)]2+ and HQ•) and the kinetics of their formation and disappearance have been established by steady-state emission and time-resolved emission, absorption, and EPR measurements. The protonated, reduced complex [Ru(bpy)2(bpzH•)]2+ functions as a H-atom reductant toward quinone or benzaldehyde with potential implications for net photochemistry and energy conversion.read more
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Journal ArticleDOI
Proton-Coupled Electron Transfer
David R. Weinberg,Christopher J. Gagliardi,Jonathan F. Hull,Christine Fecenko Murphy,Caleb A. Kent,Brittany C. Westlake,Amit Paul,Daniel H. Ess,Dewey G. McCafferty,Thomas J. Meyer +9 more
TL;DR: Proton-coupled electron transfer is an important mechanism for charge transfer in a wide variety of systems including biology- and materials-oriented venues and several are reviewed.
Journal ArticleDOI
Electrochemical Approach to the Mechanistic Study of Proton-Coupled Electron Transfer
TL;DR: The analysis of such stepwise mechanisms both in aprotic media and in water is reviewed, with particular recent emphasis on electrochemical and theoretical approaches to proton-coupled electron transfer processes.
Journal ArticleDOI
Integrating proton coupled electron transfer (PCET) and excited states
Christopher J. Gagliardi,Brittany C. Westlake,Caleb A. Kent,Jared J. Paul,John M. Papanikolas,Thomas J. Meyer +5 more
TL;DR: In this article, a photoelectrochemical synthesis cell (DS-PEC) is proposed for coupled, light driven oxidation and reduction in artificial photosynthesis, where photolysis of organic charge transfer excited states with H-bonded bases or in metal-to-ligand charge transfer (MLCT) excited states in pre-associated assemblies with H bonded electron transfer donors or acceptors.
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Update 1 of: Electrochemical approach to the mechanistic study of proton-coupled electron transfer.
Journal ArticleDOI
Proton-coupled electron transfer with photoexcited metal complexes.
TL;DR: Recent studies of excited-state PCET with d(6) metal complexes with central question whether concerted proton-electron transfer (CPET) can compete kinetically with sequential electron and proton transfer steps are described.
References
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One-electron reduction of ruthenium(II)-diimine complexes. Characterization of reduced species containing 2,2'-bipyridine, 2,2'-bipyrimidine, and 2,2'-bipyrazine in aqueous solution
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Protonation of the ground states of ruthenium(II) photosensitizers
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Oxidation-reduction behavior of bianthrone and bianthronyl in basic dimethyl sulfoxide solutions
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Electronic absorption and emission of aromatic hydroxycarbonium ions
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Exploring complex CIDEP of p -benzosemiquinones with time resolved CW-EPR
TL;DR: In this paper, the time and magnetic field dependent magnetization of polarized signals in the presence of chemically induced magnetization transfer is described by means of a kinetic matrix incorporated into the Bloch equations.