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

• DOI: 10.1002/ange.201104757
• Publication Date: 2011-09-28T13:34:36Z
• Authors: Mickael L. Perrin; Ferry Prins; Christian A. Martin; Ahson J. Shaikh; Rienk Eelkema; Jan H. van Esch; Tomas Briza; Robert Kaplanek; Vladimir Kral; Jan M. van Ruiten...; Herre S. J. van d...; Diana Dulić
• Keywords: Condensed Matter - Mesoscale and Nanoscale Physics; Mesoscale and Nanoscale Physics (cond-mat.mes-hall); FOS: Physical sciences; 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 0104 chemical sciences

8 pages, 4 figures<br/>Porphyrin molecules can form stable single molecule junctions without anchoring groups. Adding thiol end groups and pyridine axial groups yields more stable junctions with an increased spread in low-bias conductance. This is a result of different bridging geometries during breaking, the stability of which is demonstrated in time-dependent conductance measurements. This is in strong contrast with rod like molecules which show one preferential binding geometry.<br/>