Intramolecular Electron Transfer at Metal Surfaces. IV. Dependence of Tunneling Probability upon Donor-Acceptor Separation Distance.

Abstract

Unimolecular electron-transfer rate constants, k sub et, are reported for the one-electron reduction of pentaaminecobalt (III) attached to gold and mercury electrodes via thioalkylcarboxylate ligands containing varying numbers, n, of alkyl carbons. While similar values of k sub et were found at mercury for each reaction, for close-packed monolayers at gold the k sub et values decreased by circa 10 to the 4th power as an increased from one to five. This effect is identified with increasingly nonadiabatic pathways as an increases, a linear plot of log k sub et versus n being obtained. The results provide estimates of the electronic transmission coefficient as a function of the surface-Co(III) separation distance.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1984
Accession Number
ADA145611

Entities

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  • Michael J. Weaver
  • T. T. T. Li

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  • Purdue University

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  • Materials and Manufacturing Processes

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  • Abstracts
  • Chemistry
  • Coefficients
  • Electrochemical Reactions
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  • Electron Transfer
  • Electrons
  • Metals
  • Military Research
  • Monomolecular Films
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  • Probability
  • Quantum Tunneling
  • Tunneling
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  • Chemistry

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