The role of the cis-keto triplet state in the proton transfer cycle of 2-(2′-hydroxyphenyl)benzothiazole
Journal
Chemical Physics Letters
Journal Volume
195
Journal Issue
5-6
Pages
586-590
Date Issued
1992
Author(s)
Abstract
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′2→S′1 intersystem crossing (ISC, prime denotes the tautomer state) of the cis-keto form. The T-S ISC yield was measured to be 5.2×10-4 in a 77 K MCH glass. A mechanism incorporating Tnπ*→Sππ* 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. © 1992.
SDGs
Type
journal article