The vibronic absorption and emission spectra of 3-pentyl-4'-cyanobiphenyl i
n nonpolar, moderately polar and polar solvents, as well as Fourier Transfo
rm Infira Red absorption spectra of biphenyl, 4-ethyl-4'-cyanobiphenyl and
4-pentyl-4'-cyanobiphenyl in KBr were measured. In these two kinds of spect
ra, change of the band shape has been observed for flexible molecules. (C)
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