Three novel bisbranched oxadiazole derivatives, N-{4-{2-{3,5-di[5-(4-tert-butylphenyl)-1,3,4- oxadiazol-2-yl]phenyl}-E-vinyl}phenyl}-diphenylamine (BBOD-2), N,N-di{4-{2-{3,5-di[5-(4-tert-buty- phenyl)-1,3,4-oxadiazol-2-yl]phenyl}-E-vinyl}phenyl}aniline (BBOD-3) and N,N,N-tris{4-{2-{3,5-di[5-(4- tert-butylphenyl)-1,3,4-oxadiazol-2-yl]phenyl}-E-vinyl}phenyl}amine (BBOD-4), were synthesized through Wittig and Heck reactions. Their structures were characterized by IR, 1HNMR, MS and melting points. A detailed spectrum study of these molecules, including absorption and fluorescence in different solvents, was conducted. The maximum absorption peaks in dichloromethane were at 390 nm for BBOD-2, 398 nm for BBOD-3 and 408 nm for BBOD-4, respectively. The maximum emission wavelengths were at 486 nm for BBOD-2, 483 nm for BBOD-3 and 487 nm for BBOD-4 in dichloromethane, respectively. The relationship of Stokes shift with solvent polarity was discussed.

Key words: Wittig reaction, 1,3,4-oxadiazole derivative, Heck reaction, fluorescence property