Condensed-Matter Physics & Materials Science Seminar

"Conductance Versus Conformation of Single Molecule Junctions Using Amine-Gold Linkages"

Presented by Latha Venkataraman, Columbia University

Thursday, January 25, 2007, 1:30 pm — Small Seminar Room, Bldg. 510

We recently demonstrated that the conductance of single molecule junctions formed by breaking Au point contacts in an environment of molecules with amine linkages can be measured reliably and reproducibly . We have now studied junctions formed by approximately 30 different amine terminated molecules, allowing systematic study of the correlation between molecular properties and single molecule junction conductance. This talk will focus on the relation between molecular conductance and molecule conformation for the simple case of a biphenyl, two benzene rings linked together by a single C-C bond. It is well known that the conductance of a biphenyl should vary with the relative twist angle between the two rings with the planar conformation having the highest conductance. Our results from a series of seven biphenyl derivatives show that the molecular junction conductance depends on the twist angle. Specifically, we find that the planar molecule has the highest conductance, and the conductance for the series decreases with increasing twist angle, consistent with a cosine squared relation predicted theoretically

Hosted by: Antonio Checco

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