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Measurement of Ultrafast Photoinduced Electron Transfer from Chemically Anchored Ru-Dye Molecules into Empty Electronic States in a Colloidal Anatase TiO2 Film

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Hannappel,  Thomas
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Burfeindt,  Bernd
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Storck,  Winfried
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Hannappel, T., Burfeindt, B., Storck, W., & Willig, F. (1997). Measurement of Ultrafast Photoinduced Electron Transfer from Chemically Anchored Ru-Dye Molecules into Empty Electronic States in a Colloidal Anatase TiO2 Film. The Journal of Physical Chemistry B, 101(35), 6799-6802. doi:10.1021/jp971581q.


Cite as: https://hdl.handle.net/21.11116/0000-0008-A1A0-C
Abstract
Electron transfer from the excited electronic singlet state of chemisorbed ruthenium(II) cis-di(isothiocyanato)-
bis(2,2´-bipyridyl-4,4´-dicarboxylate) into empty electronic states in a colloidal anatase TiO2 film was measured
as a transient absorption signal of the injected hot electrons with a rise time <25 fs. Optical absorption of the anchored dye molecules led to the excited singlet state of the dye with a small admixture of charge transfer states. The electron transfer reaction reported here did not involve redistribution of vibrational excitation
energy and was thus completely different from the well-known Marcus-Levich-Jortner-Gerischer type of electron transfer in the case of weak electronic interaction. It was also not a direct optical charge transfer transition from the donor to the acceptor level but rather an electron transfer reaction with an ultrashort but
finite reaction time.