Photophysical properties of solutions of several cyanovinylaniline derivatives

The photophysical properties of donor-acceptor conjugated organic chromophores such as f4-(1,2,2-tricyanovinyl)-[N,N-bis(2-hydroxyethyl)g-aniline (TCVA) and its derivatives with slight structural changes were studied by investigating the steady-state absorption, emission, and the uorescence decay lifetime. TCVA trimer in dichloromethane (DCM) showed a uorescence spectrum peaked at 590 nm, and its uorescence decay lifetime in solution was 3.7 ns. For TCVA, the uorescence intensity was markedly quenched in comparison with TCVA trimer and the decay lifetime shortened to the value of a few tens of ps. The quenching eect shown in TCVA can be explained by the hydrogen bonding between OH and N atoms. Also, it was found that the uorescence lifetime of the chromophore was aected by the presence of the hydroxyalkyl group attached to the N atom of the aniline moiety. Fluorescence characteristics of the molecules in solvents of dierent polarities were investigated to ascertain the underlying mechanism. KCI Citation Count: 4