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Excited-state proton transfer in a benzotriazole photostabilizer investigated by femtosecond spectroscopy

โœ Scribed by M. Wiechmann; H. Port; F. Laermer; W. Frey; T. Elsaesser

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
621 KB
Volume
165
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

The proton transfer in 2-(2'-hydroxy-5 '-methylphenyl)henzotriazole is studied in nonpolar solvents, where two major ground state conformers are identified. After femtosecond excitation of the predominant species, the hydroxylic proton is transferred to the benzotriazole moiety on a time scale of 100 fs. The excited state of the resulting keto tautomer is deactivated by internal conversion to the electronic ground state within 200 fs. The subsequent hack-reaction to the ground state of the enol tautomer also OCCURS in the subpicosecond regime. Keto emission in the red spectral range 1s observed for the first time in nonpolar solvents at room temperature.

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