Effect of the metal on electron transfer across self-assembled monolayers

被引：61

作者：

Finklea, HO ^{[1
]}

Yoon, K ^{[1
]}

Chamberlain, E ^{[1
]}

Allen, J ^{[1
]}

Haddox, R ^{[1
]}

机构：

[1] W Virginia Univ, Dept Chem, Morgantown, WV 26506 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2001年 / 105卷 / 15期

关键词：

D O I：

10.1021/jp0041510

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Electron-transfer kinetic measurements are made on one type of self-assembled monolayer {HS(CH2)(15)COOH with attached [Ru-II(NH3)(5)(4-aminomethylpyridine)]}on gold, platinum, and silver polycrystalline electrodes in one electrolyte at room temperature. Cyclic voltammograms over a wide range of scan rates are analyzed to extract the rate constants as a function of overpotential. Tafel plots are fitted to theoretical curves based on the Marcus DOS theory to obtain the standard rate constants and the reorganization energies. A reorganization energy of 0.8 +/- 0.1 eV is obtained on ah three metals. The standard rate constants for Au, Pt, and Ag are 1.0 +/- 0.3, 1.7 +/- 0.4, and 0.6 +/- 0.2 s(-1). The results confirm the theoretical prediction that the electronic coupling of "d" band states in the metal to remote redox centers is weak.

引用

页码：3088 / 3092

页数：5

共 26 条

[1] ELECTROCHEMISTRY AT OMEGA-HYDROXY THIOL COATED ELECTRODES .3. VOLTAGE INDEPENDENCE OF THE ELECTRON-TUNNELING BARRIER AND MEASUREMENTS OF REDOX KINETICS AT LARGE OVERPOTENTIALS [J].