The fluorescence spectra of bichromophore compounds 2-(ω-biphenylylpolymethylene)-5-biphenylyl-1,3,4--oxadiazole (1-4) and its corresponding model compounds 2-methyl-5-biphenylyl-1,3,4-oxadiazole (5) and 2,5-dibiphenylyl-1,3,4-oxadiazole (6) have been determined. The forma-tion ofintra-and intermolecular excimers and exciplexes have been studied. The relationship betweenthe molecular configuration and the formation of intra exciplex have been discussed. From the experi-mental results, it can be seen that when the number of the carbon atoms of the methylene bridge isodd, intra exciplex is readily formed The fluorescence spectra of bichromophore compounds 2- (ω-biphenylylpolymethylene) -5-biphenylyl-1,3,4-oxadiazole (1-4) and its corresponding model compounds 2-methyl- The formation ofintra-and intermolecular excimers and exciplexes have been studied. The relationship betweehe molecular structure and the formation of intra From the experi-mental results, it can be seen that when the number of the carbon atoms of the methylene bridge is odd, intra exciplex is strategically formed