Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 5: Posters 1: Electronic Spectroscopy, Photochemistry, Femtosecond Spectroscopy

MO 5.4: Poster

Montag, 17. März 2014, 16:30–18:30, Spree-Palais

Electronic structure investigation on mono- and trinuclear transition metal complexes — •Anneken Grün¹, Fabian Dietrich¹, Kifah Salih¹, Ezgi Keceli¹, Saeid Farsadpour¹, Christian Sarcher², Peter Roesky², Werner Thiel¹, and Markus Gerhards¹ — ¹TU Kaiserslautern, Fachbereich Chemie, Erwin-Schrödinger-Str. 52/54, 67663 Kaiserslautern, Germany — ²KIT, Fachbereich Chemie, Engesserstr. 15, 76131 Karlsruhe, Germany

Absorption and emission spectra of mono- and trinuclear transition metal complexes in solution are recorded to investigate their electronic structure. Furthermore lifetimes of the excited states are determined by using the time correlated single photon counting (TCSPC) method. The results are compared with the one of the pure ligands and additionally a comparison with DFT calculations is performed. The structurally unique hexakis(µ²-3-phenyl-pyrazolato)trinickel(II) complex with diamagnetic nickel(II) centers is of special interest to form nonametallic species by reacting with 3(5)-ferrocenylpyrazole which possesses six redox active ferrocenyl moieties^[1]. The absorption and fluorescence spectra of the trinuclear complex were obtained in solid state, whereas in solution degradation was observed. For the mononuclear dichlorido{[2-(3-pyrazolyl)phenyl]diphenylphosphine}nickel(II) complex two different fluorescence bands are observed. A focus on these systems is the analysis of a possible HCl elimination after photoexcitation.

[1] K. Salih et al. Eur. J. Inorg. Chem. 2013, 6049-6059.