Direct STM observation of electronic structure modification of naphthacenequinone molecules due to photoisomerization

Oreshkin, A. I.; Panov, V. I.; Vasil’ev, S. I.; Koroteev, N. I.; Magnitskii, S. A.
September 1998
JETP Letters;9/25/98, Vol. 68 Issue 6, p521
Academic Journal
Light-induced conformational transformations of the naphthacenequinone (NQ) molecules are observed by scanning tunneling microscopy (STM). NQ molecules packed in a Langmuir-Blodgett (LB) film are shown to form stable ordered structures on a surface of highly oriented pyrolytic graphite (HOPG). The local density of electronic states is found to exhibit the distinct peak which is characteristic of two-dimensional conductivity. An additional subband of empty electronic states is found for NQ molecules in form A but not in form B. The constant-height STM images of individual molecules in form A demonstrate an additional structure that is indicative of a conformational transition of the NQ molecules. This transition involves the transfer of the phenoxy group from one oxygen to another.


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