The synthesis and optical properties of novel 1,3,4-oxadiazole derivatives containing an imidazole unit

Abstract

A series of 1,3,4-oxadiazole derivatives containing an imidazole unit were synthesized and characterized using 1H NMR, 13C NMR, mass spectrometry (or high-resolution mass spectrometry) and elemental analysis. The crystal structure of 2,5-bis(4-(1- n-butyl-4,5-diphenylimidazol-2-yl)phenyl)-1,3,4-oxadiazole was determined as monoclinic, space group C2/c type, using single crystal X-ray crystallography. For nine samples, UV–visible absorption coefficient ( ɛ), maximum wavelength ( λ max), fluorescence excitation wavelength ( λ ex), fluorescence emission wavelength ( λ em), fluorescence quantum yield ( Φ F), fluorescence lifetime ( T) were measured in dichloromethane and in the solid state. For these selected compounds, thermogravimetric analysis was also employed and structure:optical behaviour characteristics were discussed.