2006•The Journal of Physical Chemistry BRequires access

Observation of Single Dinuclear Metal-Complex Molecules Using Scanning Tunneling Microscopy

Zhongqing Wei, Song Guo, S. Alex Kandel

Abstract

We report a scanning tunneling microscopy (STM) investigation of a dinuclear organometallic molecule, trans-[Cl(dppe)2Ru(C[triple bond]C)6Ru(dppe)2Cl] (Ru2), absorbed on a Au(111) surface; this molecule is a potential candidate for use in molecular quantum-dot cellular automata (QCA) devices. Isolated Ru2 molecules were observed under ultra-high-vacuum conditions. Submolecular structure was clearly discernible in the STM images, with a bright feature corresponding to each of the two Ru-ligand complexes within the Ru2 molecule. Rotation and translation of the Ru2 molecules were observed to be induced by the STM tip under some tunneling conditions.

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Key concepts: Scanning tunneling microscope, Molecule, Quantum tunnelling, Crystallography, Chemistry, Ligand (biochemistry), Scanning tunneling spectroscopy, Metal