Sum Frequency Generation Spectroscopic Study on Photoinduced Isomerization of Poly(vinyl alcohol) Containing Azobenzene Side Chain at the Air−Water Interface

DOI Web Site 被引用文献3件
  • C. Ohe
    Department of Chemistry, School of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa, Nagoya 464-8603, Japan
  • H. Kamijo
    Department of Chemistry, School of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa, Nagoya 464-8603, Japan
  • M. Arai
    Department of Chemistry, School of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa, Nagoya 464-8603, Japan
  • M. Adachi
    Department of Chemistry, School of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa, Nagoya 464-8603, Japan
  • H. Miyazawa
    Department of Chemistry, School of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa, Nagoya 464-8603, Japan
  • K. Itoh
    Department of Chemistry, School of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa, Nagoya 464-8603, Japan
  • T. Seki
    Department of Chemistry, School of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan, and Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa, Nagoya 464-8603, Japan

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Sum frequency generation (SFG) spectra were measured for the monolayers of a poly(vinyl alcohol) derivative (6Az10-PVA, see Figure 1A) containing azobenzene side chains at the air−water interface. The surface pressure dependence of the spectra was analyzed to elucidate structural changes of the monolayers associated with the trans−cis isomerization of the azobenzene group. The SFG spectra in the 3600−3150 cm-1 region observed for the trans-6Az10-PVA monolayer, where the OH stretching bands of water molecules associated with the PVA backbone are observed, suggest that a dissolution process of the backbone from the water surface into a bulk water takes place upon increasing the surface pressure from 20 to 45 mN/m. The spectra in the CH stretching vibration region of the alkyl group side chain indicates that the group in the cis-6Az10-PVA monolayer exists in a more irregular state containing gauche defects compared to those of the trans monolayer, although the content of the gauche defects is appreciably red...

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