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

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9 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)7085-7090
Number of pages6
JournalJapanese Journal of Applied Physics
Issue number12
Publication statusPublished - Dec 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Engineering
  • General Physics and Astronomy


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