Laser photolysis study of the exciplex between triplet benzil and triethylamine
Nanosecond laser flash photolysis techniques have been used to examine the triplet decay and radical-ion formation in the triethylamine (TEA) - benzil system in wet acetonitrile. Under conditions of high TEA concentrations yielding short triplet lifetime, the formation of the benzil radical anion was found to be considerably slower than the decay of the triplet state. This effect is attributed to the intermediacy of a relatively stable exciplex whose properties are reported here. Results of a study of optical density of the system with time following laser excitation led to the assignment of a lifetime of 55ns to the exciplex formed between the triplet benzil and TEA. A structure is suggested for the exciplex. Results of experiments with the non-polar medium n-heptane indicated a shorter lifetime exciplex or one with very different properties from the species identified in the polar medium, wet acetonitrile. (BLM)
- Research Organization:
- Notre Dame Univ., IN
- OSTI ID:
- 5018458
- Journal Information:
- J. Am. Chem. Soc.; (United States), Vol. 101:26
- Country of Publication:
- United States
- Language:
- English
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