標題: Relaxation dynamics of ruthenium complexes in solution, PMMA and TiO2 films: The roles of self-quenching and interfacial electron transfer
作者: Chang, Chih-Wei
Chou, Chung Kuang
Chang, I-Jy
Lee, Yuan-Pern
Diau, Eric Wei-Guang
應用化學系
應用化學系分子科學碩博班
Department of Applied Chemistry
Institute of Molecular science
公開日期: 6-Sep-2007
摘要: The relaxation dynamics of two transition-metal complexes, [Ru(bpy)(3)](2+) and [Ru(bpy)(3)(mcbpy)](2+), in ethanol solution and in poly(methyl methacrylate) (PMMA) and TiO2 films have been investigated with time-resolved emission and femtosecond transient absorption spectroscopy. The emission lifetime of a degassed [Ru(bpy)3]21 solution in ethanol was determined to be 700 ns; to describe the self-quenching kinetics due to aggregation, three decay coefficients, 5.3, 70, and 220 ns, were obtained for the [Ru(bPY)(3)](2+)/PMMA film. The electron transfer through space in a [Ru(bpy)(3)](2+)/TiO2 film competed with intrinsic intersystem crossing (similar to 100 fs) and vibrational relaxation (similar to 6 ps) in solid films. For the [Ru(bpy)(2)(mcbpy)](2+)/TiO2 film, although the relaxation for electron transfer through bonds was more rapid than electron transfer through space, both processes occur on similar time scales. Through ferntosecond transient absorption measurements, we provide important dynamical evidence for the interfacial electron transfer in both forward and backward directions. We conclude that in dye-sensitized solar-cell applications processes for interfacial electron transfer are significant not only through bonds but also through space.
URI: http://dx.doi.org/10.1021/jp073843m
http://hdl.handle.net/11536/10340
ISSN: 1932-7447
DOI: 10.1021/jp073843m
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 111
Issue: 35
起始頁: 13288
結束頁: 13296
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