Direct Observation of Intermediates in Sensitization Reaction of Anthracenes and Oxime Type Photoacid Generator in Polymer Matrix

Abstract

In the anthracene derivatives (XA) /an oxime type photoacid generator (PAG), (Z,E)-2-(4-methoxy-phenyl)-2-[(4-methylphenyl-sulphonyl)oxyimino]-acetonitrile (PAIOTos) photoinitiating system to give high photosensitivities, radical cations XA^.+ were directly observed. It clearly supports that the sensitization mechanism is the singlet electron transfer from XA to the PAG. The XA/PAIOTos system gave higher sensitivity than PAIOTos did in a photopolymer materials.