Mainz 2017 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 1: Photochemistry
MO 1.3: Vortrag
Montag, 6. März 2017, 15:15–15:30, N 6
Spectroscopic Investigation of a Cr-Complex on the fs-Time Scale — •Aleksej Friedrich1, Sven Otto2, Christoph Förster2, Christoph Kreitner2, Katja Heinze2, and Stefan Lochbrunner1 — 1Institute of Physics, University of Rostock, Germany — 2Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Germany
Ultrafast spectroscopy is performed on the metal complex [Cr(ddpd)2][BF4]3 (ddpd: N,N’-dimethyl-N,N’-dipyridine-2-ylpyridine-2,6-diamine). The compound is an interesting candidate for NIR OLEDs, fiber-optic telecommunication applications, night-vision readable displays, oxygen sensing, and in vivo imaging. The molecule is water soluble and exhibits strong and extremely long living photo luminescence around 775 nm [1]. While the ground state is a quartet state the emitting state is a doublet. The intermolecular processes after excitation are not fully understood. We carried out fs-transient-absorption and streak-camera measurements to investigate these processes. We found a fast population of the lowest emitting doublet state within 6 ps and a luminescence lifetime of 840 µs. No indication for stimulated emission was observed. This indicates that the intersystem crossing between the quartet and doublet manifold occurs within our time resolution of 100 fs and the 6 ps dynamics is due to relaxation within the doublet manifold.
[1] S. Otto et al., Angew. Chem. Int. Ed.,54,11572 (2015).