Synthesis and Application of Multifunctional Polymeric Photosensitizer Having Pendant Photosenstitizing and Substrate-attracting Groups

Abstract

A multifunctional polymeric photosensitizer having pendant photosensitizing and substrateattracting groups was synthesized by radical copolymerization of photosensitizer monomers such as 4-nitro-1-naphthyl methacrylate and basic monomers such as 2-(dimethylamino)ethyl methacrylate using 2, 2'-azobisisobutyronitrile in N, N-dimethylformamide or benzene.
The photochemical reaction of methyl cinnamate with these polymeric photosensi tizers was carried out in THF. From the results of these investigations, it was found that the multifunctional polymeric photosensitizer with the pendant substrate-attracting group, which has dipole-dipole interaction between the substrate-attracting group in the polymer and methyl cinnamate, reveals an excellent photosensitizing activity compared with the conventional polymeric photosensitizer having only photosensitizer and with the corresponding low-moleculare-weight photosensitizer. In addition, the multifunctional polymeric photosensitizer has a higher photosensitizing activity at the larger content of the substrateattracting groups.