Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 41: Inorganic/Organic Interfaces

O 41.31: Poster

Tuesday, March 17, 2015, 18:15–21:00, Poster B

Photoswitching Kinetics of Azobenzene SAMs on Gold(111) — •Thomas Moldt, Daniel Przyrembel, Wibke Bronsch, Larissa Boie, Daniel Brete, Cornelius Gahl, and Martin Weinelt — Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin

Mixed self-assembled monolayers (SAMs) formed of azobenzene-functionalized alkanethiols and alkanethiol spacers show reversible photoisomerization [1]. Here we examined the photoisomerization kinetics of that system using near edge X-ray absorption fine structure and optical differential reflectance spectroscopy. We determined the photoisomerization cross sections as well as the thermal cis-trans isomerization rate and estimated the ratios of trans vs. cis components in the photostationary states. While in the dark the cis isomer is stable for hours under ambient atmosphere, in vacuo it switches back within minutes.

[1] Moldt et al., submitted.