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Influence of Conformation on Conductance of Biphenyl-Dithiol Single-Molecule Contacts

Mishchenko, Artem ; Vonlanthen, David ; Meded, Velimir ; Bürkle, Marius ; Li, Chen ; Pobelov, Ilya V. ; Bagrets, Alexei ; Viljas, Janne K. ; Pauly, Fabian ; Evers, Ferdinand ; Mayor, Marcel ; Wandlowski, Thomas


The conductance of a family of biphenyl-dithiol derivatives with conformationally fixed torsion angle was measured using the scanning tunneling microscopy (STM)-break-junction method. We found that it depends on the torsion angle φ between two phenyl rings; twisting the biphenyl system from flat (φ = 0°) to perpendicular (φ = 90°) decreased the conductance by a factor of 30. Detailed calculations ...


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