Determination of Reorganization Energy from the Temperature Dependence of Electron Transfer Rate Constant for Hydroquinone-tethered Self-assembled Monolayers (SAMs) 


Vol. 27,  No. 3, pp. 381-385, Mar.  2006
10.5012/bkcs.2006.27.3.381


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  Abstract

The temperature dependence on the electron transfer rate constant (app) for hydroquinone redox center in 2Q(C2nSH-SAMs (n = 1, 4, 6, 8, 10, and 12) on gold electrode was investigated to obtain reorganization energy (λ) using Laviron’s formalism and Arrhenius plot of ln [app/T1/2] vs. T-1 based on the Marcus densityof-states model. All the symmetry factors measured for the SAMs were relatively close to unity and rarely varied to temperature change as expected. The electron tunneling constant (β) determined from the dependence of the app on the distance between the redox center and the electrode surface gives almost the same β values which are quite insensitive to temperature change. Good linear relationship of Arrhenius plot for all 2Q(C2nSH-SAMs on gold electrode was obtained in the temperature range from 273 to 328 K. The slopes in Arrhenius plot deduced that λ of hydroquinone moiety is ca. 1.3-1.4 eV irrespectively of alkyl chain length of the electroactive SAM.

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  Cite this article

[IEEE Style]

W. Park and H. Hong, "Determination of Reorganization Energy from the Temperature Dependence of Electron Transfer Rate Constant for Hydroquinone-tethered Self-assembled Monolayers (SAMs)," Bulletin of the Korean Chemical Society, vol. 27, no. 3, pp. 381-385, 2006. DOI: 10.5012/bkcs.2006.27.3.381.

[ACM Style]

Wonchoul Park and Hun-Gi Hong. 2006. Determination of Reorganization Energy from the Temperature Dependence of Electron Transfer Rate Constant for Hydroquinone-tethered Self-assembled Monolayers (SAMs). Bulletin of the Korean Chemical Society, 27, 3, (2006), 381-385. DOI: 10.5012/bkcs.2006.27.3.381.

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ISSN(Print) 0253-2964
ISSN(Online) 1229-5949