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• W2030900194 startingPage "11973" @default.
• W2030900194 abstract "Specific control of photoinduced molecular reactions is desired for various reasons, not least to increase photostability by avoiding harmful, reactive intermediate states. In this paper we will present a way to specifically deactivate the excited-state of merocyanines by selectively addressing additional pathways. The photodynamics for different merocyanines in solution as well as coupled to semiconductor nanoparticles have primarily been investigated by transient absorption spectroscopy. For the free dye, two main fast deactivation pathways exist, one involving an isomerization around the central polymethine chain of the molecule, and the other involving the population of a triplet state. The coupling to a semiconductor nanoparticle provides a way to change photoinitiated dynamics. An ultrafast electron transfer from the dye to the TiO2 nanoparticle takes place, and the isomerization reaction is accelerated by a factor of 20. The population of the triplet state is quenched and does not take place at all. In contrast to the well-known function of TiO2 as photocatalyst, we report here a molecular mechanism that quenches possible degradation pathways and thus might increase the photostability of the adsorbate in a dye/semiconductor system." @default.
• W2030900194 created "2016-06-24" @default.
• W2030900194 creator A5028296149 @default.
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• W2030900194 date "2008-07-02" @default.
• W2030900194 modified "2023-10-12" @default.
• W2030900194 title "Quenching of Triplet State Formation by Electron Transfer for Merocyanine/TiO₂ Systems" @default.
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• W2030900194 doi "https://doi.org/10.1021/jp7106928" @default.
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