Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MO: Fachverband Molekülphysik
MO 34: Photochemistry
MO 34.6: Vortrag
Freitag, 18. März 2011, 11:45–12:00, TOE 317
Temperature dependent generation and relaxation behavior of photoswitchable [Ru(bpy)2(OSO)]+ — •Sebastian Eicke, Annika Kruse, Volker Dieckmann, Kristin Springfeld, and Mirco Imlau — Department of Physics, University of Osnabrück, Barbarastr. 7, D-49069 Osnabrück, Germany
Ruthenium sulfoxide [Ru(bpy)2(OSO)]+ (OSO: 2-methylsulfinylbenzoate) offers a light-induced linkage isomerization located at the SO-ligand resulting in pronounced changes of characteristic optical properties. This molecule dissolved in propylene carbonate was studied in respect to its photochromism and kinetics of the generation and relaxation of the light-induced metastable isomers. The kinetics were determined by temperature and exposure dependent pump-probe technique and show in each case a temperature dependency on the characteristic time constants following Arrhenius law. The generation kinetics reveal two ways the linkage isomerization can take place. Whereas one exhibits an activation energy EA,1≈0.1 eV, the second one only appears for T>25 ∘C with a temperature independent behavior. The relaxation kinetics disclose two activation energies EA,2=0.76 eV and EA,2=1.00 eV which can be assigned to the two metastable isomers MS1,2. An efficient and fast light-induced conversion and long lifetimes of the two metastable isomers in the range of 103 s at room temperature allow for application of this molecule in a multiplicity of devices like ultra-fast optical switches or optical molecular data storage.