Synthesis and Characterization of Potential Efficient Electroluminescent Materials:2-Phenyl-5-[4-(4-phenylamino-2H-1,2,3-triazol-2-yl)]phenyl-1,3,4-oxadiazole Derivatives

摘要

Recently,1,3,4-oxadiazole-based on heterocyclic compounds were investigated as electroluminescent materials.In this work,we first introduce 1,2,3-triazole to synthesize a series of 1,3,4-oxadiazole-1,2,3-triazole hybrids derivatives as potential electroluminescent materials and explore the effect of modification of the 1,2,3-triazole moiety.The lambda_(max)values of the UV-vis of 1,3,4-oxadiazole-1,2,3-triazole hybrids are promoted to longer wavelengths(340-350 nm)than the traditional 1,2,3-triazole derivatives(280-330 nm)in solutions and have a bathochromic shift to 350-360 nm in THF solution.The lambda_(max)values of the photoluminescence(PL)spectra are in the range 406-180 nm in solutions.Compound 7h evaporated to form films on quartz substrates,had a maximum at 455 nm and showed a red-shift(approx= 40 nm)with respect to the solution spectrum.The solution fluorescence quantum yields(phi_f)were measured,all of which fell into the range 0.65-0.76,and were determined relative to that of 2-phenyl-5-(4-biphenyl)-1,3,4-oxadiazole in benzene(phi_f = 0.80).1,3,4-Oxadiazole-1,2,3-triazole hybrids derivatives show unclearly reversible reduction processes in cyclic voltammogram measurements.Following spectroscopic studies and observation of the electrochemical behaviors,1,3,4-oxadiazole-1,2,3-triazole derivatives were determined to be highly potential efficient blue electroluminescent materials.