Photoisomerization of Sterically Hindered Azobenzenes in Self-Assembled Monolayers on Gold Surfaces

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概要

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• The photoisomerization characteristics of sterically hindered azobenzenes in self-assembled monolayers (SAMs) on flat gold surfaces have been investigated by ultraviolet–visible (UV–vis) absorption spectroscopy and contact angle measurements. Upon UV light irradiation, 2Et-2S substituted with two ethyl groups at the ortho positions and Me-2S with a methyl group at the meta position showed significant changes in $\pi$–$\pi^{*}$ absorption bands, together with reductions in contact angles for water, as a consequence of trans-to-cis photoisomerization. The reversible trans $\leftrightarrow$ cis photoisomerization of azobenzenes in SAMs was clearly observed upon alternating UV and visible light irradiation. Furthermore, 2Et-2S underwent very slow thermal cis-to-trans isomerization over 24 h at ambient temperature, which is likely to be due to the steric hindrance of diethyl groups near the azo linkage.

• 2010-06-25

著者

• Ishikawa Daisuke

  Department Of Electrical Engineering Faculty Of Engineering Kanagawa University

• Ito Eisuke

  Flucto-order Functions Research Team Riken-hyu Collaboration Research Center Riken Advanced Science Institute

• Daisuke Ishikawa

  Department of Electronic Chemistry, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan

• Honda Takumu

  Department of Electronic Chemistry, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan

• Mina Han

  Department of Electronic Chemistry, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan

• Masahiko Hara

  Department of Electronic Chemistry, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan

• Eisuke Ito

  Flucto-Order Functions Research Team, RIKEN-HYU Collaboration Research Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

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