Influence of the Chemical Structure on the Stability and Conductance of Porphyrin Single‐Molecule Junctions

Different bridging geometries can explain the observation that porphyrin molecules with added thiol end groups and pyridine axial groups form more-stable single-molecule junctions with an increased spread in low-bias conductance. The stability of these geometries is demonstrated by time-dependent conductance measurements. In contrast, rodlike molecules show one preferential binding geometry.