Acta Phys. -Chim. Sin. ›› 1997, Vol. 13 ›› Issue (01): 42-47.doi: 10.3866/PKU.WHXB19970108

• ARTICLE • Previous Articles     Next Articles

Structure-Dependent Electron Transfer Kinetics of Azobenzene Self-Assembled Monolayers on Gold

Zhao Jian-Wei,Yu Hua-Zhong,Wang Yong-Qiang,Zhang Hao-Li,Liu Zhong-Fan   

  1. Certer for Intelligent Materials Research(CIMR),College of Chemistry and Molecular Engineering,Peking University,Beijing 100871
  • Received:1996-07-19 Revised:1996-10-03 Published:1997-01-15
  • Contact: Liu Zhong-Fan

Abstract:

 The self-assembling process and electrochemical behavior of (4-ethoxy-4'-N-(2"-mercaptoethyl) aminocarbonyl-azobenzene monolayer on gold were investigated by cyclic voltammetry and contact angle measurements. The apparent electron transfer rate constant ks was found to decrease with increasing the surface coverage. Taking account of the structural change associated with the reduction/oxidation process of azobenzene to hydrazobenzene, the unique decrease of apparent electron-transfer rate constants could be well understood by the inhibition on such a molecular structure change of close packing film structure, which may lead to an increase of activation free energy for the reduction/oxidation process.

Key words: Self-assembled monolayers(SAM), Azobenzene derivative, Highly organized molecular system, Apparent electron-transfer rate eonstant