Photoisomerization Ability of Molecular Switches Adsorbed on Au(111): Comparison between Azobenzene and Stilbene Derivatives
| Autor: | László Óvári, Peter Saalfrank, Tillmann Klamroth, Felix Leyssner, Jadranka Dokić, Petra Tegeder, Sebastian Hagen, Stefan Hecht, Maike V. Peters |
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| Rok vydání: | 2009 |
| Předmět: |
Molecular switch
Photoisomerization High resolution electron energy loss spectroscopy Electronic structure Photochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion chemistry.chemical_compound General Energy Azobenzene chemistry Physical and Theoretical Chemistry HOMO/LUMO Isomerization |
| Zdroj: | The Journal of Physical Chemistry C. 114:1231-1239 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | High resolution electron energy loss spectroscopy and two-photon photoemission was employed to derive the adsorption geometry, electronic structure, and the photoisomerization ability of the molecular switch tetra-tert-butyl-stilbene (TBS) on Au(111). The results are compared with the azobenzene analogue, tetra-tert-butyl-azobenzene (TBA), adsorbed on Au(111). TBS was found to adsorb on Au(111) in a planar (trans) configuration similar to TBA. The energetic positions of several TBS-induced electronic states were determined, and in comparison to TBA, the higher occupied molecular states (e.g., the highest occupied molecular orbital, HOMO) are located at similar energetic positions. While surface-bound TBA can be switched with light between its trans and cis configurations, in TBS this switching ability is lost. In TBA on Au(111), the trans → cis isomerization is driven by a substrate-mediated charge transfer process, whereby photogenerated hot holes in the Au d band lead to transient positive ion formation... |
| Databáze: | OpenAIRE |
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