Azopyridine-containing methacrylate monomer was copolymerized with
N-isopropylacrylamide by radical polymerization. The copolymer with
N-isopropylacrylamide content of >0.99 showed a solvent-dependent photochromic behavior. In a THF solution, the
trans-cis photoisomerization of the azopyridine moieties smoothly proceeded by a UV light irradiation, while the copolymer displayed a negligible change in the UV/Vis absorption spectra in water. The decrease in the photoisomerization efficiency was probably due to the immobilization of the
trans-azopyridine moieties in the polymer matrices because of hydrogen-bonding interactions between the amide and pyridine groups and water molecules.
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