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Two new kinds of polymer, copolymer P 1-2 and homopolymer P 3 , containing norbornadiene and carbazole pendants were synthesized. The photoinduced valence isomerizations of norbornadiene to quadricyclane in polymer P 1-2 and P 3 were achieved by irradiation of visible light (wavelength, greater than 350 nm) and an electron transfer mechanism was...