Photolysis was studied of cationic iron(II)-arene complex[(h6-(1-methylethyl)benzene) (h5-cyclopentadienyl)iron(II)-hexafluorophosphate] with sensitizer [bis(p-N,N-dimethylaminobenzylidene)cyclopentanone]. Results obtained in the process of sensitization showed that not only the electron transfer and energy transfer process, but also the salt formation reaction of sensitizer with photolytic product of iron(II)-arene complex occurred. Results have also indicated that some active radicals which can initiate the polymerisation of ethylenically unsatd. monomer, e.g. Me methylacrylate, were observed in the products from the electron transfer process. The mechanism of photolysis is discussed.

Key words: PHOTOCHEMICAL REACTION, METHYLMETHACRYLATE, INITIATOR, PHOTOSENSITIZATION, REACTION MECHANISM, IRON COMPLEX, POLYMERIZATION, ELECTRON TRANSFER REACTION, AROMATIC HYDROCARBON COMPLEX