Photophysical behaviour of exciplexes of trans-styrylphenanthrenes with amines

Abstract

The photophysical properties of exciplexes between the five trans-n-styrylphenanthrenes (n-StPh, with n= 1–4 and 9) and amines (D) were studied by fluorimetry. The quenching rate constants, fluorescence quantum yields and lifetimes were determined in n-hexane and toluene by steady-state and transient emission techniques. The equilibria between StPhs in the singlet excited state and diethylaniline (DEA) and tributylamine (TBA) were characterized in terms of formation (k_EM), dissociation (k_ME) and decay (k_E) rate constants of the exciplexes.