Synthesis and characterization of 1,3,4-oxadiazole-triazolopyridinone hybrid derivatives as new blue-greenish photoluminescent materials

Recently, New functionalized oxadiazole-triazolopyridinone hybrid compounds were investigated as photoluminescent materials. In this work, we introduce triazolopyridinone to synthesize a series of oxadiazole-triazolopyridinone hybrid derivatives as potential photoluminescent materials and explore the effect of modification of the triazolopyridinone moiety. The X.., values of the photoluminescence (PL) spectra of 1,3,4-oxadiazole-triazolopyridinone hybrids are promoted to longer wavelengths (470486 nm) than the traditional 1,2,3-triazole derivatives (410-425 nm) in solutions. PL spectra 5a, 5d, and 5g of the vacuum evaporated films on quartz substrates, with a maximum at 487 nm, shows a redshift (similar to 15-20 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-triazolopyridinone hybrid derivatives show clearly non-reversible reduction processes in cyclic voltammogram measurements. Following spectroscopic studies and observation of the electrochemical behaviors, 1,3,4-oxadiazole-triazolopyridinone derivatives were determined to be potential efficient blue-greenish photoluminescent materials.