Abstract
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 (T i) for the molecular parts using the equation G = G 0×T1×T2×T3×... Unique combination of T i 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 T por-Au than that of the bridge between thiolate and the gold electrode (T S-Au). This indicates that the porphyrin free base work as a good anchoring group to gold electrode. Figure 1
Published Version
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