Conformation-dependent intramolecular excimer formation in jet-cooled 1,3-diphenylpropane

Intramolecular excimer formation from photoexcited diarylalkanes in a supersonic beam has been studied, for the first time, using laser induced fluorescence. The results on 1,3-diphenylpropane demonstrate the presence of four major ground-state conformations which display differing efficiency for the excimer formation. The conformation dependence of the excimer formation allows tentative assignments of the species in terms of the four major rotational isomers expected for the molecule