High-conductance surface-anchoring of a mechanically flexible platform-based porphyrin complex

High-conductance surface-anchoring of a mechanically flexible platform-based porphyrin complex

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The conductances of molecular model junctions comprising a triazatriangulenium platform with or without an ethynyl spacer and an Sharpener upright Zn-porphyrin are probed with a low-temperature scanning probe microscope.The platform alone is found to be highly conductive.The ethynyl-linked Zn-porphyrin moiety reduces the conductance by three orders of magnitude and leads to an unexpected, non-monotonous variation of the force that was measured simultaneously at the tip of the microscope.Density Prostate Health functional theory calculations show that this variation results from an induced tilting of the porphyrin.