Journal
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
Volume 277, Issue 1-3, Pages 223-228Publisher
ELSEVIER
DOI: 10.1016/j.ijms.2008.04.024
Keywords
Molecular switches; Surface vibrational spectroscopy; Reversible isomerization; Azobenzene derivative
Funding
- Deutsche Forschungsgemeinschaft [131, 138]
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High resolution electron energy loss spectroscopy (HREELS) is employed to analyze reversible changes in the geometrical structure of the molecular switch di-methoxy-tetra-tert-butyl-azobenzene (diM-TBA) adsorbed on Au(1 1 1), which are induced by UV-light and thermal activation While for I monolayer (ML) coverage no changes in the vibrational structure due to UV-light exposure at 3.5 eV are observed, illumination of 2 ML of diM-TBA leads to a pronounced modification of the vibrational spectra, which we assign to a trans -> cis isomerization. The reverse process, i.e., the cis -> trans isomerization, can be stimulated by thermal activation. We propose that the photoisomerization is driven by a direct (intramolecular) electronic excitation of the adsorbed diM-TBA molecules in the second ML analogous to diM-TBA in the liquid phase. (C) 2008 Elsevier B.V. All rights reserved.
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