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Abstract
This work is devoted to the study of cis-trans photoisomerization of 1,2-di(1-naphtyl)-ethylene (DNE) in the condensed phase. The reaction of photoisomerization of the diaryl-ethylene is well known,1 the reaction of cis-trans photoisomerization occurring even at 77°K. This reaction is believed to occur with a decrease of the molecular volume.2 Therefore, we supposed that the reaction of cis-trans isomerization would occur in the condensed solid state.