Electrochemical Scanning Tunneling Spectroscopy of Redox-Active

ALEJANDRA M. RICCI; ERNESTO J. CALVO; SANTIAGO MARTIN; RICHARD J. NICHOLS

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

American Chemical Society

Lugar: Washington DC; Año: 2010 vol. 132 p. 2494 - 2495

0002-7863

The Au-C- and Au-S-tethered Os complex systems in the STM “tunneling” gap configuration show similar ET mechanisms, namely, two-step ET between the molecule and the contacts (tip and substrate) with partial vibrational relaxation. Similar results have been reported previously for Os complexes tethered by pyridine N to Au and Pt2 in aqueous electrolyte and bis(terpyridine)osmium with thiol linkers in ionic liquids but not for Au-C contacts. This demonstrates that molecular wires can be linked directly to Au through a C linkage while still retaining theirmolecular electronics and electrochemical functionality, as demonstrated here through the gated electrochemical transistor behavior.-C- and Au-S-tethered Os complex systems in the STM “tunneling” gap configuration show similar ET mechanisms, namely, two-step ET between the molecule and the contacts (tip and substrate) with partial vibrational relaxation. Similar results have been reported previously for Os complexes tethered by pyridine N to Au and Pt2 in aqueous electrolyte and bis(terpyridine)osmium with thiol linkers in ionic liquids but not for Au-C contacts. This demonstrates that molecular wires can be linked directly to Au through a C linkage while still retaining theirmolecular electronics and electrochemical functionality, as demonstrated here through the gated electrochemical transistor behavior.