Monitoring electron transfer in an azobenzene self-assembled monolayer by in situ infrared reflection absorption spectroscopy

Hua Zhong Yu, Hao Li Zhang, Zhong Fan Liu, Shen Ye, Kohei Uosaki

研究成果: Article査読

35 被引用数 (Scopus)

抄録

The redox behavior of the self-assembled monolayer of 4-ethoxy-4′-((N-(10″-mercaptodecyl)amino)-carbonyl)azobenzene (CH3CH2O-Ph-N=N-Ph-C(O)NH(CH2)10-SH, abbreviated as C2AzoC10SH below) on a gold electrode surface has been investigated by electrochemical in situ Fourier transform infrared reflection absorption spectroscopy (FT-IRRAS). The bands observed in the potential dependent IRRAS spectra corresponded well to the reduction/oxidation process of the azobenzene group in the monolayer. No bands were found in the in-situ FT-IRRAS spectra for the C-H stretch of the methylene group and the N-H stretch as well as the C=O stretch of the amide moiety, suggesting that no orientation change occurs in the polymethylene chain of the monolayer during the redox reaction of the azobenzene group. The band intensity observed in the in-situ IRRAS spectra depends on the reaction time, especially in the reduction process of the azobenzene monolayer. Our results provided direct evidence for a slower reduction of azobenzene to hydrazobenzene than the reverse process, i.e., oxidation of hydrazobenzene, thus augmenting the importance of understanding the relationship between monolayer structure and electron transfer.

本文言語English
ページ(範囲)619-624
ページ数6
ジャーナルLangmuir
14
3
DOI
出版ステータスPublished - 1998 2 3
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 表面および界面
  • 分光学
  • 電気化学

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