Reversible isomerization of an azobenzene derivative adsorbed on Au(1 1 1): Analysis using vibrational spectroscopy

László Óvári, Jutta Schwarz, Maike V. Peters, Stefan Hecht, Martin Wolf, Petra Tegeder

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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 1 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 t r a n s → c i s isomerization. The reverse process, i.e., the c i s → t r a n s 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.

Original languageEnglish
Pages (from-to)223-228
Number of pages6
JournalInternational Journal of Mass Spectrometry
Volume277
Issue number1-3
DOIs
Publication statusPublished - Nov 1 2008

Keywords

  • Azobenzene derivative
  • Molecular switches
  • Reversible isomerization
  • Surface vibrational spectroscopy

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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