Tuning the electrical conductance of metalloporphyrin supramolecular wires.

ABSTRACT: In contrast with conventional single-molecule junctions, in which the current flows parallel to the long axis or plane of a molecule, we investigate the transport properties of M(II)-5,15-diphenylporphyrin (M-DPP) single-molecule junctions (M=Co, Ni, Cu, or Zn divalent metal ions), in which the current flows perpendicular to the plane of the porphyrin. Novel STM-based conductance measurements combined with quantum transport calculations demonstrate that current-perpendicular-to-the-plane (CPP) junctions have three-orders-of-magnitude higher electrical conductances than their current-in-plane (CIP) counterparts, ranging from 2.10^-2 G₀ for Ni-DPP up to 8.10^-2 G₀ for Zn-DPP. The metal ion in the center of the DPP skeletons is strongly coordinated wi

SUBMITTER: Noori M 

PROVIDER: S-EPMC5116753 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature