Stuttgart 2012 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 8: Photochemistry

MO 8.3: Vortrag

Dienstag, 13. März 2012, 11:00–11:15, V38.02

Photochromic polypyridine ruthenium sulfoxide complexes on their way to condensed matters — •Kristin Springfeld, Volker Dieckmann, Sebastian Eicke, and Mirco Imlau — Department of Physics, University of Osnabrück, Germany

Creating new, more efficient data storage systems brings strong demand for materials that exhibit fast recording processes and long storage times. A promising approach are optical data storage devices that make use of photochromic molecules as storage materials, e.g., ruthenium polypyridine sulfoxides. They offer light-induced linkage isomerization at the SO-ligand accompanied with a pronounced UV/VIS photochromism, a tremendous photosensitivity and high thermal stability of the two metastable isomers. However, the field of applications is limited so far, because only molecular solutions are available. Here, we discuss the characteristic photochromic properties of the compounds in the frame of ligand substitution and replacement of the dielectric environment. The complex [Ru(bpy)₂(ROSO)]·PF₆ [1] (with OSO: 2-methylsulfinylbenzoate) has been modified with several functional groups and was studied in different solvents as well as immobilized in an inorganic polymer. The analysis is performed by cw-pump-probe technique as a function of temperature and exposure. We discuss the impact of our findings in view of application in molecular photonic devices.

Financial support by the DFG (INST 190/137-1) and the DAAD (50445542) is gratefully acknowledged.

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