| Abstract | The fluorescence decay from S2(p, p*) state of 2,5-diphenyl-1,6,6a-trithiapentalene (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 (lex 532 nm) from the S1(n, p*) state, DP-TTP in deoxygenated benzonitrile, acetonitrile,
ethanol and tetrahydrofuran solutions give rise to transient triplet–triplet absorption (lmax
T 700–720 nm). Kinetic
data are presented for intrinsic triplet lifetimes, self-quenching and quenching by oxygen. © 2001 Elsevier Science
B.V. All rights reserved. |