Photophysics and Halide Quenching of Soret-excited ZnTPPS4- in Aqueous Media - Publication - Bridge of Knowledge

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Photophysics and Halide Quenching of Soret-excited ZnTPPS4- in Aqueous Media

Abstract

Steady state S2-S0 and S1-S0 absorption and emission spectra and picosecond S2 decay and S1 fluorescence rise times have been measured for the model porphyrin ZnTPPS4− in water and in aqueous iodide solutions of constant ionic strength. The dynamics of S1 quenching by iodide are well-modeled by a Stern-Volmer mechanism yielding kQ = 1.75 × 109 M−1 s−1. The S2 state is quenched on a ps time scale by a static electron-transfer mechanism at an average donor-acceptor separation of 0.38 nm. The implications of these data for dye-sensitized solar cells that employ I−/I3− as the redox medium are discussed.

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Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
CHEMICAL PHYSICS LETTERS no. 501, pages 278 - 282,
ISSN: 0009-2614
Language:
English
Publication year:
2011
Bibliographic description:
Szmytkowski J., Brunet S., Tripathy U., O'brien J., Paige M., Steer R.: Photophysics and Halide Quenching of Soret-excited ZnTPPS4- in Aqueous Media// CHEMICAL PHYSICS LETTERS. -Vol. 501, nr. Iss. 4-6 (2011), s.278-282
Verified by:
Gdańsk University of Technology

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