LAUSR

Abstract Synthesis and structure of novel dyad which molecule includes two fluorophores - 1,2,4,5-tetraarylimidazole and 8-arylazomethino-7-hydroxycoumarin, are described with the aim to obtain compounds with tunable luminescence. The fluorescent excited states of both fluorofores are formed as a result of excited-state intramolecular proton transfer (ESIPT) in each of them. The fluorophores in the dyad were connected by the diphenyl oxide bridge that provided limited interaction between them and the ability to implement both ESIPTs and corresponding dual fluorescence in polymers as well as in solutions. Steady state and transient UV–Vis absorption and fluorescence of the dyad and model compounds were studied using conventional as well as nanosecond and femtosecond laser flash photolysis techniques. Novel dyad demonstrates combinations of different fluorescences processes controlled by the excitation wavelength and the medium.