Excited-state quenching by proton-coupled electron transfer

被引：99

作者：

Concepcion, Javier J. ^{[1
]}

Brennaman, M. Kyle ^{[1
]}

Deyton, Jeremy R. ^{[1
]}

Lebedeva, Natalia V. ^{[1
]}

Forbes, Malcolm D. E. ^{[1
]}

Papanikolas, John M. ^{[1
]}

Meyer, Thomas J. ^{[1
]}

机构：

[1] Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2007年 / 129卷 / 22期

关键词：

D O I：

10.1021/ja069049g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 (H(2)Q) by proton-coupled electron transfer (PCET), most likely by concerted electron-proton transfer (EPT). The identity of the transient products ([Ru(bpy)(2)(bpzH(center dot))](2+) and HQ(center dot)) 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(center dot))](2+) functions as a H-atom reductant toward quinone or benzaldehyde with potential implications for net photochemistry and energy conversion.

引用

页码：6968 / +

页数：3

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