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DF: Fachverband Dielektrische Festkörper

DF 6: Optical and nonlinear optical properties, photonic

DF 6.4: Vortrag

Dienstag, 15. März 2011, 11:40–12:00, MÜL Elch

Tunability of the photofunctional properties in photochromic polypyridine ruthenium sulfoxide complexes — •Kristin Springfeld, Volker Dieckmann, Sebastian Eicke, and Mirco Imlau — Department of Physics, University of Osnabrück, Barbarastr. 7, D-49069 Osnabrück, Germany

Ruthenium polypyridine sulfoxide compounds feature photo-triggered linkage isomerization into two metastable structural isomers. This isomerization is accompanied by a pronounced photochromism in the UV/VIS spectral range. The absorption changes are combined with a tremendous photosensitivity and a high thermal stability of the structural isomers. In this contribution, we discuss the modification of photochromic properties in the frame of ligand substitution and the replacement of the dielectric environment of the compounds. The complex [Ru(bpy)₂(ROSO)]·PF₆ [1] (with OSO: 2-methylsulfinylbenzoate) is modified with the groups R = H, Bn, BnCl and BnMe [2] and studied in different solvents. The studies are performed by UV/VIS laser-spectroscopy as a function of temperature and exposure. Our results reveal a selective tunability of the thermal stability in the compounds, while the photosensitivity and the characteristic absorption spectra remain unchanged. We discuss the impact of our findings in view of application of sulfoxide compounds in molecular photonic devices.

Financial support by the DFG (GRK 695) is gratefully acknowledged.

[1] Dieckmann et al., Opt. Express, 17, 15052 (2009)

[2] Dieckmann et al., Opt. Express, 18, 23495 (2010)