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Solvent isotope effect on the fluorescence of azoalkanes

✍ Scribed by Manfred J. Mirbach; Marlis F. Mirbach; William R. Cherry; Nicholas J. Turro; Paul Engel

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
304 KB
Volume
53
Category
Article
ISSN
0009-2614

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✦ Synopsis

A study of fluorescence quantum yields and fluorescence lifetimes of the cyclic azoalkanes I and II reveals a striking dependence of @P and rF on solvent and on isotopic substitution (OH 4 OD). A mechanism involving specific deactivation of the fluorescent state from a hydrogen bonded complex is proposed to rationalize 't&e data. The observation that the quantum yield for decomposition of I does not correlate with the variation of fluorescence parameters with solvent and isotopic change leads to the conclusion that the state responsible for photoreaction preceeds the fluorescent state.

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