Hannover 2020 – scientific programme
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MO: Fachverband Molekülphysik
MO 8: MO Poster 2
MO 8.4: Poster
Tuesday, March 10, 2020, 17:00–19:00, Empore Lichthof
Ultrafast processes in Ru(II)-Au(I)-complexes bridged via paracyclophane with varying metal-metal-distances — •Lars Schüßler1, Roumany Israil2, Marcel Schmitt2, Christoph Zippel3, Daniel M. Knoll3, Stefan Bräse3, Christoph Riehn2, and Rolf Diller1 — 1Dept. of Physics, TU Kaiserslautern, 67663 Kaiserslautern — 2Dept. of Chem., TU Kaiserslautern, 67663 Kaiserslautern — 3Dept. of Org. Chem., KIT, 76131 Karlsruhe
The novel complex [Ru(bpy)2(ppy)-PCP-(PPh2)AuCl]+ (1) (bpy = 2,2’-bipyridine, ppy = 2-phenylpyridine, PCP = paracyclophane, PPh2 = diphenylphosphine) [1] - where a Ru(II)-antenna-unit is bridged via PCP to a catalytically active Au(I)-unit - is perfectly suited to systematically investigate the electronic communication between the two metal centers by tuning their distance and the electronic coupling via structurally diverse PCP-bridges (binding sites at the PCP unit, e.g. pseudo-para-position with longer metal-metal-distance as compared to pseudo-ortho-position). We employ fs transient absorption spectroscopy in the UV/Vis in solution combined with gas phase studies by fs pump-probe fragmentation action spectroscopy [2] to elucidate the underlying ultrafast photophysics and -chemistry as well as the metal-metal-interaction. First results on (1) in dichloromethane with lifetimes τ1,2,3 = 1.3, 14.1, 590 ps suggest strongly altered kinetics compared to results on [Ru(bpy)3]2+ [3].
[1] D. M. Knoll et al. Dalton Trans., 2019, DOI: 10.1039/C9DT04366G
[2] D. Imanbaew et al. Angew. Chem. Int. Ed., 2017, 56, 5471-5474
[3] Q. Sun et al. Coord. Chem. Rev., 2015, 282-283, 87-99