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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
EA,I=0.72 eV to 0.92 eV and
EA,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).