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O: Fachverband Oberflächenphysik
O 6: Organic/bio Molecules on Metal Surfaces I
O 6.7: Talk
Monday, March 31, 2014, 12:00–12:15, TRE Phy
Switching and charging of a ruthenium dye — •Nadine Hauptmann1, Christian Hamann1, Hao Tang2, and Richard Berndt1 — 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany — 2CEMES/CNRS 29, rue Jeanne Marvig, B.P. 94347, 31055 Toulouse Cedex, France/ Université de Toulouse, UPS, 31055 Toulouse, France
The ruthenium dye N3 (cis-bis(isothiocyanato)bis-(2,2’-bipyridyl-4,4’-dicarboxylato)-ruthenium(II)), is deposited on metal surfaces by ultra-high vacuum electrospray ionization and is investigated using low-temperature scanning tunneling microscopy. Scanning tunneling spectroscopy of single molecules reveals vibronic excitations that are related to the lowest unoccupied molecular orbital. Switching of N3 molecules attached to Ag(111) step edges may be induced and modifies the energy of the negative ion resonance as well as the vibrational progression. Moreover, charging of the molecule is induced at reversed bias. This data suggests a surprisingly weak electronic coupling of N3 to the Ag substrate. A double-barrier model reproduces the essential spectral features.