Conductance and geometry of pyridine-linked single-molecule junctions

M. Kamenetska, Su Ying Quek, A. C. Whalley, M. L. Steigerwald, H. J. Choi, Steven G. Louie, C. Nuckolls, M. S. Hybertsen, J. B. Neaton, L. Venkataraman

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Abstract

We have measured the conductance and characterized molecule-electrode binding geometries of four pyridine-terminated molecules by elongating and then compressing gold point contacts in a solution of molecules. We have found that all pyridine-terminated molecules exhibit bistable conductance signatures, signifying that the nature of the pyridine-gold bond allows two distinct conductance states that are accessed as the gold-molecule-gold junction is elongated. We have identified the low-conductance state as corresponding to a molecule fully stretched out between the gold electrodes, where the distance between contacts correlates with the length of the molecule; the high-conductance state is due to a molecule bound at an angle. For all molecules, we have found that the distribution of junction elongations in the low-conductance state is the same, while in the high-conductance state, the most likely elongation length increases linearly with molecule length. The results of first-principles conductance calculations for the four molecules in the low-conductance geometry agree well with the experimental results and show that the dominant conducting channel in the conjugated pyridine-linked molecules is through the φ* orbital.

Original languageEnglish
Pages (from-to)6817-6821
Number of pages5
JournalJournal of the American Chemical Society
Volume132
Issue number19
DOIs
Publication statusPublished - 2010 May 19

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All Science Journal Classification (ASJC) codes

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

Cite this

Kamenetska, M., Quek, S. Y., Whalley, A. C., Steigerwald, M. L., Choi, H. J., Louie, S. G., Nuckolls, C., Hybertsen, M. S., Neaton, J. B., & Venkataraman, L. (2010). Conductance and geometry of pyridine-linked single-molecule junctions. Journal of the American Chemical Society, 132(19), 6817-6821. https://doi.org/10.1021/ja1015348