2020 年 19 巻 4 号 p. 158-160
Single-molecule junctions have unique electron transport properties that are not found in solids or polymers. Graph theoretical approaches have been used to predict whether conductivity in single-molecule junctions. In this paper, the change in single-molecule conductivity when carbon atoms in alternant hydrocarbons are replaced with heteroatoms is investigated by using the graph-theoretic path-counting method. The results predicted by graph theory are consistent with those obtained by using nonequilibrium Green's function combined with the Hückel method.