Berlin 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)
O 58.38: Poster
Mittwoch, 28. März 2012, 18:15–21:45, Poster B
UV-Vis spectroscopy studies of photoswitching of azobenzene-containing molecular platform adlayers on Au — •Nicolai Krekiehn1, Ulrich Jung1, Mathias Müller1, Jens Kubitschke2, Sandra Ulrich2, Rainer Herges2, and Olaf Magnussen1 — 1Institut für Experimentelle und Angewandte Physik der Christian-Albrechts-Universität, Kiel, Deutschland — 2Otto-Diels-Institut für Organische Chemie Christian-Albrechts-Universität, Kiel, Deutschland
Photofunctional self-assembled monolayers (SAMs) on solid substrates are of current interest for the preparation of functional nanosystems. These SAMs, however, often exhibit inherent disadvantages as reduced structural order or strong electronic coupling with the substrate (in particular pronounced for metals), which may cause an efficient quenching of the desired functions. We recently introduced a novel aproach for formation of such SAMs basing on molecular platforms, whose structural properties (orientation of the function, lateral and vertical distances of the platforms) can be precisely controlled and verified this concept by STM[1] and various spectroscopies[2].
Here, we present preliminary spectroscopic studies of photoswitching in platform SAMs containing azobenzene, a prototypical molecular switch. Measurements were performed in either transmission or reflection geometry. The photoswitching reactions were found to obey 1st order kinetics and exhibit high quantum efficiencies.
[1] Kuhn et al. PCCP (2010), 12, 4481,[2] Jung et al., Langmuir (2011), 27, 5899