Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.36: Poster
Dienstag, 1. April 2014, 18:30–22:00, P1
Intramolecular Dipole of Merocyanine probed by Local Contact Potential Difference Measurements — •Nils Krane1, Christian Lotze1, Xianwen Chen1, José I. Pascual1,2, and Katharina J. Franke1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Germany — 2CIC nanoGUNE, San Sebastián, and Ikerbasque, Basque Foundation for Science, Bilbao, Spain
The merocyanine form of the molecular switch 1,3,3-Trimethylindolino-6’-nitrobenzopyrylospiran exhibits an intramolecular dipole in gas phase and solution [1]. When adsorbed on a metal surface, charge redistribution and screening may considerably alter the expected dipole behaviour. Using a combined low-temperature scanning tunneling microscope/atomic force microscope, we investigate the adsorption and intramolecular charge distribution of merocyanine on Au(111). The lateral and vertical distribution of the local contact potential difference (LCPD) hint at the persistence of an intramolecular dipole.
[1] D. Lapienis-Grochowska et al. Journal of the Chemical Society, Faraday Transactions 2 75, 312 (1979)