Regensburg 2010 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 15: Optical and nonlinear optical properties, photonics II

DF 15.7: Vortrag

Donnerstag, 25. März 2010, 12:30–12:50, H11

Tunability of photoswitchable ruthenium sulfoxide compounds on the basis of ligand substitution — •Sebastian Eicke, Volker Dieckmann, Kristin Springfeld, and Mirco Imlau — Deparment of Physics, University of Osnabrück, Barbarastr. 7, D-49069 Osnabrück, Germany

Photoswitchable ruthenium sulfoxide compounds provide a light-induced linkage isomerization in combination with pronounced changes in characteristic optical properties.
As representative of the ruthenium sulfoxide group the molecular compound [Ru(bpy)₂(R-OSO)]⁺ (OSO: 2-methylsulfinylbenzoate) can be tuned in its optical properties by the substitution of the photoswitchable ligands (R=Bn, BnCl, BnMe). These modified sulfoxides were studied in respect to their photochromic properties and kinetics of the generation and relaxation of the light-induced isomers. The kinetics were determined by pump-probe technique and show in each case two reversible termal decay processes following Arrhenius law. The two photo-excited states offer lifetimes in the magnitude of τ₁≈10³ s and τ₂≈10⁴ s at room temperature with activation energies about E_A,I=0.72 eV to 0.92 eV and E_A,II=0.8 eV to 1.00 eV. Another respresentative of the photoswitchable sulfoxides is the [Ru(bpy)₂(pySO)]²⁺ compound. This molecule is the first sulfoxide which allows for reversible switching between the ground and metastable states by light exposure. With this compound the sulfoxides are highly qualified for optical data storage on a molcular scale.
Financial support by the DFG (GRK 695).