Electron Hopping through Films of Arenethiolate Monolayer-Protected Gold Clusters
Electron Hopping through Films of Arenethiolate Monolayer-Protected Gold Clusters
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DOI：
10.1021/jp013987f
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发表时间：
2002-02
影响因子：
3.3
通讯作者：
W. P. Wuelfing;Royce W. Murray
中科院分区：
文献类型：
--
作者：
W. P. Wuelfing;Royce W. Murray
Electron hopping in films of arenethiolate (benzylthiolate, phenylethylthiolate, phenylbutanethiolate, and cresolthiolate) monolayer-protected cluster molecules (MPCs) is investigated through measurements of solid-state electronic conductivity. Electron donor−acceptor hopping rates between the Au cores of arenethiolate MPCs exceed those of previously studied solid-state alkanethiolate MPC films, but the electronic coupling term, β = 0.8 A-1, is nearly the same. Rate constants range from 108 to 1011 s-1 across the series of arenethiolate MPCs; for the case of cresolthiolate, the rate corresponds to a single molecule resistance of ∼107 Ω/cresolthiolate ligand. The 4−8 kJ/mol activation-barrier energies for electron hopping are generally in line with the Marcus theory prediction. The low barrier energies and large rate constants arise from a combination of the low dielectric medium environment of the reactants (the MPC cores) and the partly aromatic tunneling bridges. The sharp increase in film conductivity ...
