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[Synthesis and Spectral Characteristics of Novel Di-Schiff Base Derivatives Incorporting Oxadiazole Ring]

[Synthesis and Spectral Characteristics of Novel Di-Schiff Base Derivatives Incorporting Oxadiazole Ring]

Tong-bin Chen, Xiong-lu Zhang, Xiao-lin Fan, Xun Li

Guang Pu Xue Yu Guang Pu Fen Xi. 2008 Dec;28(12):2908-11.

PMID: 19248511

Abstract:

4-nitrobenzoic acid and hydraxine sulfate were cyclized with H3PO4/P2O5 to afford 2,5-bis(4-nitrophenyl)-1, 3,4-oxadiazole(1), then(1)was reduced to 2,5-bis(4-aminophenyl)-1,3,4-oxadiazole using Zn/CaCl2 as reduction reagent, and at last, a series of novel di-schiff base derivatives containing oxadiazole ring were obtained by the reaction of 2,5-bis(4-aminophenyl)-1, 3,4-oxadiazole with aromatic aldehydes (yield: 65%-81%). The structures of these compounds were confirmed by 1H NMR, FTIR and MS. Their UV-Vis spectra as well as fluorescence spectra were studied and the electrochemical properties were tested with cyclic voltammetry. The UV-Vis spectroscopy results show that the characteristic absorption peaks of 1, 3, 4-oxadiazole unit and di-schiff base unit disappeared. The maximum absorption wavelength was detected at 345-357 nm because conjugation effect made the two energy bands partially hybrid and form a new energy band structure. Fluorescence spectroscopy results show that they emit strong blue and purple fluorescence, and the emission maximum wavelengths of di-schiff base are from 390 to 407 nm. Electrochemical properties results show that they have higher affinity energy (2.36-3.04 eV) and ionic potential (5.35-6.06 eV), which indicated that they have better electron-transporting properties than PBD except 3 a and 3 h. The results give a reference to further application to organic electroluminescent devices of the target compound.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP2425958	2,5-Bis-(4-aminophenyl)-1,3,4-oxadiazole		2425-95-8	Price

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