title: Photophysical properties of 2,5-diphenyl-1,6,6a-trithiapentalene revealed by time-resolved spectroscopy.
abstract: The fluorescence decay from S2(pi, pi*) state of 2,5-diphenyl-1,6,6a-trithiapentalene (DP-TTP) in cyclohexane, tetrahydrofuran and acetonitrile solutions of a quantum yield of approximately 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 (lambda(ex) = 532 nm) from the S1(pi, pi*) state, DP-TTP in deoxygenated benzonitrile, acetonitrile, ethanol and tetrahydrofuran solutions give rise to transient triplet triplet absorption (lambdaTmax = 700-720 nm). Kinetic data are presented for intrinsic triplet lifetimes, self-quenching and quenching by oxygen.
authors.affiliation: Chemistry Department, Faculty of Education, Tanta University, Kafr El-Sheikh, Egypt. elkemary@yahoo.com
authors.forename: M A
authors.initials: MA
authors.lastname: El-Kemary
mesh_terms: D000097:Acetonitriles; D003510:Cyclohexanes; D005663:Furans; D006574:Heterocyclic Compounds, 2-Ring / Q000737:chemistry*; D007700:Kinetics; D015394:Molecular Structure; D010777:Photochemistry; D011789:Quantum Theory; D012996:Solutions; D013050:Spectrometry, Fluorescence; D013053:Spectrophotometry; D013997:Time Factors
chemical_list: C425157:2,5-diphenyl-1,6,6a-trithiapentalene; D000097:Acetonitriles; D003510:Cyclohexanes; D005663:Furans; D006574:Heterocyclic Compounds, 2-Ring; D012996:Solutions; C018674:tetrahydrofuran; C032159:acetonitrile