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Issue 25, 2013
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Switching and charging of a ruthenium dye on Ag(111)

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The ruthenium dye N3, cis-bis(isothiocyanato)bis(2,2′-bipyridyl-4,4′-dicarboxylato)-ruthenium(II), deposited on Ag(111) by ultra-high vacuum electrospray ionization 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 (LUMO). Switching of N3 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 reverse bias. These data suggest a surprisingly weak electronic coupling of N3 to the Ag substrate. A double-barrier model reproduces the essential spectral features.

Graphical abstract: Switching and charging of a ruthenium dye on Ag(111)

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Article information

08 Mar 2013
09 May 2013
First published
10 May 2013

Phys. Chem. Chem. Phys., 2013,15, 10326-10330
Article type

Switching and charging of a ruthenium dye on Ag(111)

N. Hauptmann, C. Hamann, H. Tang and R. Berndt, Phys. Chem. Chem. Phys., 2013, 15, 10326
DOI: 10.1039/C3CP51023A

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