Synthesis and properties of novel bi-schiff base derivatives incorporating oxadiazole ring as optoelectronic materials

Two novel Bis-Schiff base derivatives containing oxadiazole ring,including 2,5-bis(4-methoxyphenylmethyl-4'-aminophenyl)-1,3,4-oxadiazole(MPAO) and 2,5-bis(4-(N,N-diphenylamino)-phenylmethyl-4'-aminophenyl)-1,3,4-oxadiazole(DPAPAO) were designed and synthesized.The two target compounds were characterized by means of 1H NMR and FTIR,and their UV-Vis spectra,photoluminescence spectra,cyclic voltammetry curves and thermal stability were studied.The results show that the maximum UV absorption peaks of MPAO and DPAPAO are 354 and 388 nm respectively,and both of them emit the blue fluorescence in DMF and present strong electron-transporting property.The electron affinity energy levels of MPAO and DPAPAO are 2.88 and 3.22 eV respectively,which indicates that they have the better electron-transporting property than PBD.The analysis of TG curves show that the thermal decomposition temperatures(Td) of MPAO and DPAPAO are 386 and 453 ℃ respectively,they all have good thermal stability.