Quantum interference in acyclic systems: Conductance of cross-conjugated molecules

Gemma C. Solomon, David Q. Andrews, Randall H. Goldsmith, Thorsten Hansen, Michael R. Wasielewski, Richard P. Van Duyne, Mark A. Ratner

Research output: Contribution to journalArticlepeer-review

210 Scopus citations


We calculate that significant quantum interference effects can be observed in elastic electron transport through acyclic molecules. Interference features are evident in the transmission characteristics calculated for cross-conjugated molecules; significantly, these effects dominate the experimentally observable conduction range. The unusual transport characteristics of these molecules are highlighted through comparison with linearly conjugated and nonconjugated systems. The cross-conjugated molecules presented here show a large dynamic range in conductance. These findings represent a new motif for electron transfer through molecules that exhibit both very high and very low tunneling conductance states accessible at low bias without nuclear motion. In designing single molecule electronic components, a large dynamic range allows a high on/off ratio, a parameter of fundamental importance for switches, transistors, and sensors.

Original languageEnglish (US)
Pages (from-to)17301-17308
Number of pages8
JournalJournal of the American Chemical Society
Issue number51
StatePublished - Dec 24 2008

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry


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