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A copolymer bearing norbornadiene and carbazole as pendants was synthesized and a polymer only having norbornadiene pendants was also prepared for comparison. The valence isomerization of the norbornadiene moiety to quadricyclane moiety proceeded smoothly when the two kinds of polymers were irradiated with the light below 350 nm. If the wavelength of the incident light was above 350 nm, the isomerization...
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