LASER RAMAN INVESTIGATION OF SOLID STATE REARRANGEMENT OF BIS(O-IODOBENZOYL) PEROXIDE INTO 1-(2-IODOBENZOYLOXY)-1, 2-BENZIODOXOLIN-3-ONE.

In solid state, the thermal rearrangement of bis(O-iodobenzoyl) peroxide which yields 1-(2 prime -iodobenzoyloxy)-1,2-benziodoxolin-3-one, is investigated by laser Raman spectroscopy. The intramolecular vibration spectra are used to characterize this chemical rearangement. The phonon spectra obtained as a function of the rearrangement progress show that, in spite of the reported topotactic nature of the reaction, it proceeds by a heterogeneous mechanism. A temperature dependence study of the phonon spectra reveal no mode-softening for any optical phonons. Therefore, no evidence has been found for this reaction to be phonon-assisted.