Measurements of contact specific low-bias negative differential resistance of single metalorganic molecular junctionsElectronic supplementary information (ESI) available. See DOI: 10.1039/c3nr01284k

Negative differential resistance (NDR) behaviors of single molecule junctions composed of a thiol-terminated Ru( ii ) bis-terpyridine (Ru(tpy-SH) 2 ) molecule sandwiched between two gold electrodes are measured using a specifically modified scanning probe microscope break junction technique (SPMBJ) at room temperature. The low-bias (0.623 0.135 V) NDR observed for one of the three conductance groups is contact specific and is caused by a bias induced electrodemolecule coupling changes. Negative differential resistance (NDR) behaviors of single molecule junctions composed of a thiol-terminated Ru( ii ) bis-terpyridine (Ru(tpy-SH) 2 ) molecule sandwiched between two gold electrodes are measured using a specifically modified scanning probe microscope break junction technique (SPMBJ) at room temperature.