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Hannover 2013 – scientific programme

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MO: Fachverband Molekülphysik

MO 27: Poster 3: Collisions, Electronic Spectroscopy, Energy Transfer, Quantum Chemistry, Molecular Dynamics, Photochemistry, Spectroscopy in He-Droplets

MO 27.24: Poster

Thursday, March 21, 2013, 16:00–18:30, Empore Lichthof

Tailoring photofunctional ruthenium sulfoxides for nonlinear molecular photonics — •Sergej Bock, Sebastian Eicke, Kristin Springfeld, Volker Dieckmann, and Mirco Imlau — School of Physics, University of Osnabrück, Germany

Photofunctional ruthenium sulfoxids like [Ru(bpy)2(OSO)]+ (OSO: 2-methylsulfinylbenzoate) offer a light-induced linkage isomerization located at the SO-Ligand resulting in pronounced changes of characteristic optical properties. These properties, like the spectral addressability or the lifetimes of the isomerized metastable states, can be tuned via ligand substitution or different dielectric environments.
In this contribution, adapted molecules, dissolved in propylene carbonate, were studied with respect to its photochromism and the absorption dynamics of the metastable isomers relaxation. The absorption dynamics were determined by temperature dependent pump-probe technique and show a temperature dependency on the characteristic time constants following Arrhenius law. The relaxation kinetics of each adapted molecule disclose two activation energies in the range from EA=0.72 eV up to 1.25 eV which can be assigned to the two metastable isomers. Tunable lifetimes from τ≈103 s to 105 s at room temperature as well as a broad spectral addressability of the ground state (λ = 396−474 nm) allow for application of this molecules in a multiplicity of devices like ultra-fast optical switches or optical molecular data storage systems.
*Financial support by the DFG (INST190/137-1)

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