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The role of the cis-keto triplet state in the proton transfer cycle of 2-(2′-hydroxyphenyl)benzothiazole

✍ Scribed by Pi-Tai Chou; Marty L. Martinez; Shannon L. Studer

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
455 KB
Volume
195
Category
Article
ISSN
0009-2614

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✦ Synopsis

A two-step laser-induced fluorescence (TSLIF) study of 2-(2'-hydroxyphenyl)benzothiazole (HBT) in various solvents at < 100 K revealed an unusually high yield of tautomer emission resulting from the T; -tS', intersystem crossing (ISC, prime denotes the tautomer state) of the cis-keto form. The T-S ISC yield was measured to be 5.2 x 1 O-4 in a 77 K MCH glass. A mechanism incorporating T.,. + S,. ISC is discussed. The identical spectra between non-time-resolved prompt tautomer emission and TSLIF gives further support for the assignment to the cis-keto triplet state.

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