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6644359 
Journal Article 
SYNTHESIS OF MULTIFUNCTIONAL POLYMERIC PHOTOSENSITIZERS HAVING PENDANT PHOTOSENSITIZING GROUPS AND SUBSTRATE-ATTRACTING GROUPS - PHOTOCHEMICAL-REACTIONS OF POTASSIUM CINNAMATE USING THESE POLYMERS 
Nishikubo, T; Kameyama, A; Kishi, K; , 
1993 
1 
Kobunshi Ronbunshu
ISSN: 0386-2186 
SOC POLYMER SCIENCE JAPAN 
TOKYO 
591-598 
WOS:A1993LU79100001 
Multifunctional polymeric photosensitizers having a pendant nitrophenoxy group as a photosensitizing group, phosphonium salts as substrate-attracting groups and styrene units as spacers in the polymer chain were synthesized by the radical copolymerization of styrene (St) and p-(chloromethyl)styrene (p-CMS). The reaction of the obtained copolymers with potassium nitorophenoxide and various tertiary phosphines followed. Photoisomerization of potassium cinnamate (PCIN) was carried out using the polymeric photosensitizers in 25% methanolic aqueous solution. It was found that the rate of photoisomerization of PCIN using polymeric photosensitizers with styrene units was higher than that using polymeric photosensitizers without styrene units. When the photoisomerization of PCIN was carried out with the polymeric photosensitizer containing 15 mol% of the photosensitizing groups, 55 mol% of the substrate-attracting groups and 30 mol% of the styrene units, the isomerization proceeded with the highest efficiency. Furthermore, any excess styrene units depressed the photosensitizing efficiency to potassium cinnamate.