Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 11: Posters 2: Novelties in Molecular Physics
MO 11.7: Poster
Dienstag, 24. März 2015, 17:00–19:00, C/Foyer
Excited states dynamics of trinuclear lanthanide complexes [Ln(III)Mn(II)2-L] in gas phase and solution — •Florian Liedy1, Fabian Rupp1, Florian Bäppler1, Sebastian Kruppa1, Dimitri Imanbaew1, Yevgeniy Nosenko1, Peter W. Roesky2, Christoph Riehn1, and Rolf Diller1 — 1TU Kaiserslautern, 67663 Kaiserslautern — 2Karlsruhe Institute of Technology, 76131 Karlsruhe
Metallic coordinantion compounds containing lanthanides have attained enormous interest due to their single-molecular-magnet and unique luminescent properties. They may serve for applications in quantum computers, high density data storage or OLEDs.
We employed femtosecond time-resolved transient UV/Vis- and photofragmentation spectroscopy to elucidate the excited states dynamics and luminescent behavior of three trinuclear [Ln(III)Mn(II)2-L] [1] complexes containing Dy(III), Eu(III) or Lu(III); L=ligand.
After electronic excitation at 360 nm in solution we observe for all three derivatives the formation of the excited S1⋆ state within the experimental response time (< 150 fs) and a subsequent relaxation to the electronic ground state within 10 – 11 ps. The kinetic analysis yielded three kinetic components of τ1 = 0.4 ps, τ2 = 1.7 – 2.1 ps, τ3 = 10 – 11 ps that are tentatively assigned to stimulated emission and non-radiative decays of the S1⋆ state (τ1) and non-radiative decays of an intra-ligand-charge-transfer state (τ2) and a triplet ligand state (τ3). Our photofragmentation experiments revealed also three kinetic components on the same timescale for the Eu(III) derivate.
[1] Bhunia et al., Inorg. Chem., 2012, 51, 9589