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Photophysics of Soret-Excited Tin(IV) Porphyrins in Solution

Abstract

The photophysics of low-chlorin tin(IV) tetraphenylporphyrin dihydroxide, a core building block for axially substituted supramolecular tin porphyrin constructs, has been studied in a variety of hydrogen-bonding, nonpolar, and aprotic polar solvents using steady-state, nanosecond, and femtosecond time-resolved emission, and femtosecond time-resolved absorption methods. In hydrogen-bonding solvents the metalloporphyrin exists as solvated monomers, and its Soret-excited S2 state in these solvents exhibits the expected linear energy gap law relationship with first-order population decay times in the 0.8 to 1.7 ps range. Evidence is presented that this metalloporphyrin aggregates in other solvents at the concentrations typically used for these ultrafast measurements and yields species-averaged time-resolved data. Cw laser excitation in the Q-band under deaerated conditions produces weak S2–S0 fluorescence (photon upconversion) as a result of triplet–triplet annihilation.

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Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
JOURNAL OF PHYSICAL CHEMISTRY A no. 117, edition 33, pages 7833 - 7840,
ISSN: 1089-5639
Language:
English
Publication year:
2013
Bibliographic description:
Ghiggino K., Giri N., Hanrieder J., Martell J., Muller J., Paige M., Robotham B., Szmytkowski J., Steer R.: Photophysics of Soret-Excited Tin(IV) Porphyrins in Solution// JOURNAL OF PHYSICAL CHEMISTRY A. -Vol. 117, iss. 33 (2013), s.7833-7840
DOI:
Digital Object Identifier (open in new tab) 10.1021/jp406025j
Verified by:
Gdańsk University of Technology

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