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

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)619-624
Number of pages6
JournalLangmuir
Volume14
Issue number3
DOIs
Publication statusPublished - 1998 Feb 3
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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