Regensburg 2010 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 13: Poster II: Electrical, mechanical and optical properties, nonlinear dielectrics
DF 13.4: Poster
Mittwoch, 24. März 2010, 15:00–17:30, Poster A
Phototriggered NO and CN release from [Fe(CN)5NO]2− molecular monolayers attached to TiO2 surfaces — •Volker Dieckmann1, Mirco Imlau1, Dereje Hailu Taffa2, Lorenz Walder2, Robert Lepski3, Dominik Schaniel3, and Theo Woike3 — 1Department of Physics, University of Osnabrück, Barbarastr. 7, D-49069 Osnabrück, Germany — 2Institute of Chemistry, Universtity of Osnabrück, Barbarastr. 7, D-49069 Osnabrück, Germany — 3I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
Phototriggered NO and CN release from [Fe(CN)5NO]2− (NP) molecular monolayers is studied by a combination of electrochemistry, infrared spectroscopy, and mass spectrometry under light exposure at temperatures of 80 K and 294 K. The NP molecular monolayers were electrostatically attached to thin films of mesoporous TiO2 deposited on silicon. Irradiation of the surfaces results in NO and CN release, which is verified with mass spectrometry. The kinetics of the NO release are determined by inspection of the νNO stretching mode as a function of exposure to light in the violet/green spectral range. The decrease of the νNO-amplitude can be modeled considering the NO release as a two-step process with an intermediate state between the attached and the released state. According to literature, the intermediate state may be related to the light-induced linkage NO isomerization of the NP. Financial support by the DFG (GRK 695, WO618/8-1), the federal state of Lower Saxony (Lichtenberg-Stipendium) and the BMBF (FKZ 03X5510) is gratefully acknowledged.