The fluorescence spectra of bichromophore compounds I (n = 1, 2, 3, 4) and the model compounds 2-methyl-5-biphenylyl-1,3,4-oxadiazole and 2,5-dibiphenylyl-1,3,4-oxadiazole have been determine The formation of intra- and intermol. excimer and exciplex have been studied. The relationship between the mol. configuration and the formation of intra exciplex have been discussed. From the experimental results, it can be seen, when the no. of the carbon atoms of methylene bridge is odd, intra exciplex is readily formed.

Key words: BIPHENYL P, EXCITED STATE, CONFIGURATION, FLUOROSPECTROPHOTOMETRY, EXCIMER, OXODIAZOLE P