Regensburg 2010 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 13: Poster II: Electrical, mechanical and optical properties, nonlinear dielectrics

DF 13.4: Poster

Wednesday, March 24, 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 ν_NO stretching mode as a function of exposure to light in the violet/green spectral range. The decrease of the ν_NO-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.