Photoisomerization of azobenzene dendrimer monolayer investigated by Maxwell displacement current technique

Daisuke Shimura, Takaaki Manaka, Masayuki Nakamoto, Wei Zhao, Yutaka Majima, Mitsumasa Iwamoto, Shiyoshi Yokoyama, Tohru Kubota, Shinro Mashiko

研究成果: ジャーナルへの寄稿記事

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Photoisomerization in monolayers of a novel azobenzene compound, azobenzene dendrimer, was investigated for the first time by means of the absorption spectrum and Maxwell displacement current (MDC) technique. According to the absorption spectrum, trans-to-cis conversion ratio was estimated to be approximately 10% for the third generation of azobenzene dendrimer deposited onto a glass substrate. Temperature-dependent induced charge with trans-cis isomerization was also measured by means of MDC technique, and we found that the thermal isomerization process must be taken into account for theoretical analysis of trans-to-cis photoisomerization. The temperature dependence was theoretically treated in terms of the three-state model that takes into account the stimulated thermal isomerization. As a result, we could obtain a ground state energy barrier of 0.93 eV in cis-to-trans isomerization for the first-generation of the azobenzene dendrimer (AZ-G1), and the value is in good agreement with the previous results obtained from the molecular orbital (MO) calculation which suggests that thermal cis-to-trans isomerization in AZ-G1 passes through the inversion process.

元の言語英語
ページ(範囲)7085-7090
ページ数6
ジャーナルJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
40
発行部数12
出版物ステータス出版済み - 12 1 2001
外部発表Yes

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All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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