Abstract The IR and Raman spectra of azoxybenzene (I) and a number of its fluoroderivatives have been analysed, including the 15 N and 18 O labelled samples and complexes of some azoxybenzenes with SbCl 5. On the basis of the calculated frequencies and forms of normal vibrations of compound (I) in the valence force field, the vibration spectrum has been interpreted. The presence and number of fluorine atoms in the phenyl ...