Electronic decay constant of carotenoid polyenes from single-molecule measurements

Jin He, Fan Chen, Jun Li, Otto F. Sankey, Yuichi Terazono, Christian Herrero, Devens Gust, Thomas A. Moore, Ana L. Moore, Stuart M. Lindsay

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Abstract

The conductance of carotenoid polyenes chemically bound at each end to gold contacts has been measured for single molecules containing 5, 7, 9, and 11 carbon-carbon double bonds in conjugation. The electronic decay constant, β, is determined to be 0.22 ± 0.04 Å-1, in close agreement with the value obtained from first principles simulations (0.22 ± 0.01 Å-1). The absolute values of the molecular conductance are within a factor of 3 of those calculated from first principles. The small value of β demonstrates that conductivity drops off only slowly with chain length, confirming that carotenoid conjugated chains are relatively good molecular "wires".

Original languageEnglish
Pages (from-to)1384-1385
Number of pages2
JournalJournal of the American Chemical Society
Volume127
Issue number5
DOIs
Publication statusPublished - Feb 9 2005

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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