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Science 23 February 2001:
Vol. 291. no. 5508, p. 1443
DOI: 10.1126/science.291.5508.1443b
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This Week in Science
Direct electron transfer over distances of a few nanometers may be quite useful in molecular electronics, but the barriers that must be overcome to transfer electrons between donor and acceptor groups generally increase with increasing distance. In many cases, long-distance electron transfer requires an intermediate site, and the electrons actually "hop" rather than fire directly. Sikes et al. (p. 1519) present data from a thermal-jump experiment that indicates that direct electron transfer can occur over distances as great as 28 angstroms. In this case, electron transfer in self-assembled monolayers occurred through oligophenylenevinylene bridges that tethered ferrocene groups in solution to gold electrodes. The authors eliminate other possible mechanisms for electron transfer and suggest that these bridges may maintain greater planarity and thus greater orbital overlap than similar bridging groups that have been used previously.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
