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Chem. Commun., 2007, 1349 - 1351, DOI: 10.1039/b700909g

Rotation–libration in a hierarchic supramolecular rotor–stator system: Arrhenius activation and retardation by local interaction

Markus Wahl, Meike Stöhr, Hannes Spillmann, Thomas A. Jung and Lutz H. Gade

Fourfold symmetric zinc-octaethylporphyrin (OEP) has been incorporated in the holes of the hexagonal molecular network generated by thermal dehydrogenation of 4,9-diaminoperylene-quinone-3,10-diimine (DPDI) on a Cu(111) surface and displayed hindered rotation; the reorganization between the potential minima, a rotation–libration, which is characterized by an activation energy of ED= 0.17 ± 0.03 eV, has been monitored in the STM tunnelling currents as a bi-state switching.

Graphical abstract image for this article (ID: b700909g)