Add time:07/22/2019 Source:sciencedirect.com
The fluorescence decay from S2(π, π*) state of 2,5-DIPHENYL-1,6,6A-TRITHIAPENTALENE (cas 1033-90-5) (DP-TTP) in cyclohexane, tetrahydrofuran and acetonitrile solutions of a quantum yield of ∼0.02–0.04 were measured. The results indicate that, the dominant process of radiationless deactivation of the S2 state, is internal conversion to the S1 state. Upon laser pulse excitation (λex=532 nm) from the S1(n, π*) state, DP-TTP in deoxygenated benzonitrile, acetonitrile, ethanol and tetrahydrofuran solutions give rise to transient triplet–triplet absorption (λmaxT=700–720 nm). Kinetic data are presented for intrinsic triplet lifetimes, self-quenching and quenching by oxygen.
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