Solvent isotope effect on the fluorescence of azoalkanes |
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| Authors: | Manfred J Mirbach Marlis F Mirbach William R Cherry Nicholas J Turro Paul Engel |
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| Institution: | Department of Chemistry, Columbia University, New York, New York 10027, USA;Department of Chemistry, Rice University, Houston, Texas 77001, USA |
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| Abstract: | A study of fluorescence quantum yields and fluorescence lifetimes of the cyclic azoalkanes I and II reveals a striking dependence of ΦF and τF on solvent and on isotopic substitution (OH å OD). A mechanism involving specific deactivation of the fluorescent state from a hydrogen bonded complex is proposed to rationalize the 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 proceeds the fluorescent state. |
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