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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents

ID: 494430.0, Fritz-Haber-Institut / Physical Chemistry
Adsorption and switching properties of a N-benzylideneaniline based molecular switch on a Au(111) surface
Authors:Óvári, László; Luo, Ying; Leyssner, Felix; Haag, Rainer; Wolf, Martin; Tegeder, Petra
Date of Publication (YYYY-MM-DD):2010-07-28
Title of Journal:Journal of Chemical Physics
Journal Abbrev.:J. Chem. Phys.
Issue / Number:4
Start Page:044707–1
End Page:044707–8
Copyright:© 2010 American Institute of Physics
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:High resolution electron energy loss spectroscopy is employed to analyze the adsorption geometry and the photoisomerization ability of the molecular switch carboxy-benzylideneaniline (CBA) adsorbed on Au(111). CBA adopts on the Au(111) surface a planar (trans) configuration in the first monolayer (ML) as well as for higher coverages (up to 6 ML), contrary to the geometry in solution, which is strongly non-planar. Illumination with UV light of CBA in direct contact with the Au(111) surface (≤ 1 ML) caused no changes in the vibrational structure, whereas at higher coverages ( > 1 ML) pronounced modifications of vibrational features are 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.
Free Keywords:tert-butyl-azobenzene; self-assembled monolayers; electronic-structure; thermal-activation; para-nitroaniline; isomerization; light; spectroscopy; spectra; photochemistry
External Publication Status:published
Document Type:Article
Communicated by:Martin Wolf
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Óvári L, Hungarian Acad Sci, Chem Res Ctr, Inst Nanochem & Catalysis, React Kinet Res Lab, H-6720 Szeged, Hungary; Luo Y, Haag R, Free Univ Berlin, Inst Chem & Biochem Organ Chem, D-14195 Berlin, Germany; Leyssner F, Tegeder P (petra.tegeder@physik.u-berlin.de), Wolf M, Free Univ Berlin, FB Phys, D-14195 Berlin, Germany & Fritz Haber Inst MPG, Dept Phys Chem, D-14195 Berlin, Germany
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