Accelerated electron transfer between metal complexes mediated by DNA

M. D. Purugganan, C. V. Kumar, N. J. Turro, J. K. Barton

Research output: Contribution to journalArticlepeer-review

Abstract

DNA-mediated long-range electron transfer from photoexated 1,10-phenanthroline complexes of ruthenium, Ru(phen)2/3+, to isostructural complexes of cobalt(III), rhodium(III), and chromium(III) bound along the helical strand. The effidency of transfer depended upon binding mode and driving force. For a given donor-acceptor pair, surface-bound complexes showed greater rate enhancements than those that were intercalatively bound. Even in rigid glycerol at 253 K, the rates for donor-acceptor pairs bound to DNA remained enhanced. For the series of acceptors, the greatest enhancement in electron-transfer rate was found with chromium, the acceptor of intermediate driving force. The DNApolymer appears to provide an efficient intervening medium to couple donor and acceptor metal complexes for electron transfer.

Original languageEnglish (US)
Pages (from-to)1645-1649
Number of pages5
JournalScience
Volume241
Issue number4873
DOIs
StatePublished - 1988

ASJC Scopus subject areas

  • General

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