Laser flash photolysis study of triplets of cyclobutanethiones

Bhattacharyya, K. ; Das, P. K. (1986) Laser flash photolysis study of triplets of cyclobutanethiones Journal of Photochemistry, 32 (3). pp. 331-340. ISSN 0047-2670

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Five cyclobutanethiones with different chromophores at the 3-position were examined for triplet state behaviour in benzene using laser excitation into their low lying nπ*1 band systems. A weak transient absorption attributable to the triplet state is observed in all these cases. Results concerning triplet lifetimes, intersystem crossing yields (S1 → T1), self-quenching kinetics and kinetics of energy transfer to all-trans-1,6-diphenyl-1,3,5-hexatriene and oxygen and quenching by di-t-butyl nitroxide (DTBN) are presented. Intersystem crossing yields estimated with reference to p,p'-dimethoxythiobenzophenone are roughly unity in all five cases. Self-quenching rates are found to be less than diffusion limited and this is attributed to steric crowding at the a positions (dimethyl group). The rates of oxygen and DTBN quenching compare well with those reported for several other thiones in the literature. No transients other than the triplet were detected in the above cyclobutane-thiones.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:91433
Deposited On:21 May 2012 12:05
Last Modified:21 May 2012 12:05

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