Hannover 2020 – scientific programme
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MO: Fachverband Molekülphysik
MO 8: MO Poster 2
MO 8.5: Poster
Tuesday, March 10, 2020, 17:00–19:00, Empore Lichthof
Ultrafast study of a systematically tuned Ru(II)-polypyridine-series in gas phase and solution — •Lars Schüßler1, Roumany Israil2, Patrick Hütchen2, Werner R. Thiel2, Christoph Riehn2, and Rolf Diller1 — 1Dept. of Physics, TU Kaiserslautern, 67663 Kaiserslautern — 2Dept. of Chem., TU Kaiserslautern, 67663 Kaiserslautern
Ru(II)-polypyridine complexes are widely used in technology and medicine in applications ranging from photovoltaics or catalysis to photoactivatable prodrugs [1]. The respective photoinduced dynamics strongly depend on the relative energies of the 3MLCT- and the 3MC-excited states. Long living phosphorescence competes with photo-dissociation and -substitution. According to the specific application, a highest possible yield of one of the pathways is desirable and could be controlled by rational ligand design.
Thus, we study a series of the type [Ru(X-bpy)2(pyr-na)2]2+ (bpy = 2,2’-bipyridine, pyr-na = N-nicotinoyl-pyrrolidine) where X is a varying substituent of different electron withdrawing / donating character to systematically tune the energetics of the 3MLCT- and 3MC-excited states. The photoinduced primary processes are investigated in solution and gas phase by femtosecond transient UV/Vis absorption spectroscopy and pump-probe fragmentation action spectroscopy [2], respectively.
[1] S. E. Greenough et al. PCCP, 2014, 16, 19141-19155
[2] D. Imanbaew et al. Angew. Chem. Int. Ed., 2017, 56, 5471-5474