Research on the fluorescence spectra of 2-(ω-biphenylylpolymethylene)-5-biphenylyl-1,3,4-oxadiazole

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 formation of intra- and intermolecular excimers and exciplexes have been studied. The relationship between the molecular configuration and the formation of intra exciplex have been discussed. From the experimental results, it can be seen that when the number of the carbon atoms of the methylene bridge is odd, intra exciplex is readily formed.