Singlemolecule Conductance of Porphyrin Arrays

Tuesday, 30 May 2017: 17:00
Churchill A2 (Hilton New Orleans Riverside)
T. Tamaki, T. Ohto, R. Yamada, H. Tada (Osaka University), and T. Ogawa (Graduate School of Science, Osaka University)
Single molecule conductance of a series of porphyrin derivatives, whose porphyrin units are connected through a phenylene bridge that have one or two thiolate end groups, was measured by a scanning tunneling microscopic break junction technique. The observed conductance values were analyzed by partial transmission probabilities (Ti) for the molecular parts using the equation G = G0×T1×T2×T3×... Unique combination of Ti was obtained, which indicates the validity of this analysis. Interestingly, the free-base porphyrin ring interacting with the gold electrode showed a greater transmission probability Tpor-Au than that of the bridge between thiolate and the gold electrode (TS-Au). This indicates that the porphyrin free base work as a good anchoring group to gold electrode.