Estimation of the Rate of Electron Transfers between two Contacting Polymer Surfaces.
NORTH CAROLINA UNIV AT CHAPEL HILL DEPT OF CHEMISTRY
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A bilayer of redox polymer films, Ptpoly-Osbpy2vpy22polyRuvbpy32, is coated on a Pt electrode. Reduction of the poly-Ru3 outer film of a pre-oxidized bilayer, Ptpoly-Os3poly-Ru3 is controlled by the rate of electron diffusion through the inner, polyOs23 film. When oxidizing the outer poly-Ru2 film of a reduced Ptpoly-Os2poly-Ru2 bilayer, however, the rate of oxidation depends largely on the kinetics of electron transfer between the ca. monolayer of poly-Os3 and poly-Ru2 sites in contact at the interface between the two polymer films. The electron diffusion kinetics in the two polymer films perturb the interfacial reaction rate only slightly, so that a lower limit to the interfacial electron transfer rate constant is available.
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