Adsorption and switching properties of a N-benzylideneaniline based molecular switch on a Au(111) surface
| Autor: | Felix Leyssner, Petra Tegeder, Ying Luo, Rainer Haag, Martin Wolf, László Óvári |
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| Rok vydání: | 2010 |
| Předmět: |
Photoisomerization
Photochemistry Surface Properties Ultraviolet Rays General Physics and Astronomy High resolution electron energy loss spectroscopy Electrons Electron spectroscopy Benzoates Benzylidene Compounds Vibration Isomerism Cations Monolayer Physical and Theoretical Chemistry Molecular switch Aniline Compounds Chemistry Spectrum Analysis Temperature Self-assembled monolayer Energy Transfer Intramolecular force Solvents Adsorption Gold Isomerization |
| Zdroj: | The Journal of chemical physics. 133(4) |
| ISSN: | 1089-7690 |
| Popis: | High resolution electron energy loss spectroscopy has been employed to analyze the adsorption geometry and the photoisomerization ability of the molecular switch carboxy-benzylideneaniline (CBA) adsorbed on Au(111). CBA on Au(111) adopts a planar (trans) configuration in the first monolayer (ML) as well as for higher coverages (up to 6 ML), in contrast to the strongly nonplanar geometry of the molecule in solution. Illumination with UV light of CBA in direct contact with the Au(111) surface (or=1 ML) caused no changes in the vibrational structure, whereas at higher coverages (1 ML) pronounced modifications of vibrational features were observed, which we assign to a trans--cis isomerization. Thermal activation induced the back reaction to trans-CBA. We propose that the photoisomerization is driven by a direct (intramolecular) electronic excitation of the adsorbed CBA molecules in the second ML (and above) analogous to CBA in the liquid phase. |
| Databáze: | OpenAIRE |
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