Abstract
Ruthenium(II)−polypyridyl bis-thiocyanate complex (1) with pendant catecholate functionality was synthesized and characterized by various spectroscopic and analytical techniques. Optical absorption studies show that this molecule absorbs in the red region of the solar spectrum. Further, this molecule could couple very strongly with TiO2 nanoparticles through pendant catecholate functionality and sensitize efficiently. Interfacial electron transfer dynamics between 1 and TiO2 nanoparticles was investigated by using femtosecond transient absorption spectroscopy and following kinetics at various wavelengths in the visible and near-infrared region. Electron injection to the conduction band of the nanoparticulate TiO2 was confirmed by direct detection of an electron in the conduction band, the cation radical of the adsorbed dye (1•+), and a bleach of the dye in real time as monitored by transient absorption spectroscopy. A single exponential and pulse width limited (<100 fs) electron injection was observed. Pr...
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