Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 7, 1997
Previous Article Next Article

Long-range electron-transfer reaction rates to cytochrome c across long- and short-chain alkanethiol self-assembled monolayers: Electroreflectance studies

Abstract

The kinetics of electron transfer (ET) between cytochrome c and a gold (111) electrode through self-assembled monolayers of alkanethiols with terminal carboxylic acid groups, COOH(CH 2 ) n SH, have been studied for n=2–11 using an ac potential-modulated UV–VIS reflectance spectroscopic technique (electroreflectance spectroscopy, ER). For 9⩽n⩽11, the standard ET rate constant, k app , depends exponentially on the chain lengths and the exponential decay factor is 1.09 per methylene group; for n<9, however, k app deviates from the exponential plot. The ET reaction through short-chain alkanethiol monolayers is controlled by the preceding chemical reaction. The rate-controlling step is very likely to be the reorganization of cytochrome c to the favourable conformation for the ET reaction. The ET reaction rate constant from cytochrome c in the favourable conformation to the electrode surface obeys Marcus theory for long-range ET. The ET reaction through long-chain alkanethiol monolayers is controlled by the ET rate through alkanethiols.

Back to tab navigation

Article information


J. Chem. Soc., Faraday Trans., 1997,93, 1367-1370
Article type
Paper

Long-range electron-transfer reaction rates to cytochrome c across long- and short-chain alkanethiol self-assembled monolayers: Electroreflectance studies

Z. Qiang Feng, S. Imabayashi, T. Kakiuchi and K. Niki, J. Chem. Soc., Faraday Trans., 1997, 93, 1367
DOI: 10.1039/A605567B

Search articles by author

Spotlight

Advertisements