Electron Transfer Triggered by Optical Excitation of Phenothiazine-tris(meta-phenylene-ethynylene)-(tricarbonyl)(bpy)(py)rhenium(I)

Autor:	Gretchen E. Keller, Joshua H. Palmer, Harry B. Gray, Robert H. Grubbs, Alec C. Durrell, Bahar Bingol
Rok vydání:	2012
Předmět:	chemistry.chemical_element Rhenium Photochemistry Surfaces Coatings and Films Bipyridine chemistry.chemical_compound Electron transfer chemistry Phenothiazine Pyridine Materials Chemistry Physical and Theoretical Chemistry Luminescence Conformational isomerism Dichloromethane
Zdroj:	The Journal of Physical Chemistry B. 117:4177-4182
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp3010053
Popis:	We have investigated excited-state electron transfer in a donor-bridge-acceptor complex containing phenothiazine (PTZ) linked via tris(meta-phenylene-ethynylene) to a tricarbonyl(bipyridine)(pyridine)Re(I) unit. Time-resolved luminescence experiments reveal two excited-state (*Re) decay regimes, a multiexponential component with a mean lifetime of 2.7 ns and a longer monoexponential component of 530 ns in dichloromethane solution. The faster decay is attributed to PTZ → *Re electron transfer in a C-shaped PTZ-bridge-Re conformer (PTZ–Re ≈ 7.5 Å). We assign the longer lifetime, which is virtually identical to that of free *Re, to an extended conformer (PTZ–Re > 20 Å). The observed biexponential *Re decay requires that interconversion of PTZ-bridge-Re conformers be slower than 10^6 s^(–1).
Databáze:	OpenAIRE
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