Binding at molecule/gold transport interfaces. V. Comparison of different metals and molecular bridges

Harold Basch, Mark A. Ratner

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Abstract

The geometric and electronic structural properties of symmetric and asymmetric metal cluster-molecule-cluster complexes have been explored. The metals include Au, Ag, Pd, and Al, and both benzenedithiol and the three isometric forms of dicyanobenzene are included as bridging molecules. Calculated properties such as cluster-molecule interface geometry, electronic state, degree of metal → molecule charge transfer, metal-molecule mixing in the highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) energy region, the HOMO-LUMO gap, cluster → cluster charge transfer as a function of external field strength and direction, and the form of the potential profile across such complexes have been examined. Attempts are made to correlate charge transport with the characteristics of the cluster-complex systems. Indications of rectification in complexes that are asymmetric in the molecule, clusters, and molecule-cluster interfaces are discussed. The results obtained here are only suggestive because of the limitations of the cluster-complex model as it relates to charge transport.

Original languageEnglish
Article number234704
JournalJournal of Chemical Physics
Volume123
Issue number23
DOIs
StatePublished - 2005

Bibliographical note

Funding Information:
We are grateful to the DoD-MURI program, to the NSF Nanotechnology Institute, and to the NASA-URETI program for support of this research. We thank Dr. Pinchas Aped for help with the figures. Table S1 and Figs. S1–S7 are in the supplementary materials.

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