Erlangen 2022 – scientific programme
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MO: Fachverband Molekülphysik
MO 8: Poster 1
MO 8.21: Poster
Tuesday, March 15, 2022, 16:30–18:30, P
Spectroscopic Studies of Carbonyl and Carbonylate Compounds in Liquid Ammonia — •Stephan Muth1, Franz Schmidt2, Nikolaus Korber2, and Patrick Nuernberger1 — 1Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93040 Regensburg — 2Institut für Anorganische Chemie, Universität Regensburg, 93040 Regensburg
Metal carbonyls have a multitude of applications in chemistry, biology, and beyond. Representing a crucial ingredient in catalysis for a long time, in recent years these complexes even gained attention in applications treating cancer [1]. Reduction of metal carbonyls by alkali metals in liquid ammonia affords ammoniates, showing a vast range of different structures, characterized by single crystal X-ray analysis [2]. Identification by interaction with visible light is cumbersome and hence, less commonly employed.
To unveil the structural arrangement in solution, unknown for many compounds, we monitor carbonyls and its reduction products in liquid ammonia at different temperatures by utilizing a custom-built cryostat. Ion pairs are generated by direct reduction of neutral homoleptic or heteroleptic carbonyls with solutions of alkali metals. The extent of separation of the anionic carbonylates and the cationic ammine complexes in solution is investigated, in dependence on the transition and alkali metals. Our studies aim at identifying characteristics of ion pairing, especially under the impact of this rather exceptional solvent.
[1] H. Pfeiffer et al., Dalton Trans., 4292–4298 (2009).
[2] C. Lorenz et al., Z. Anorg. Allg. Chem. 644, 1678–1680 (2018).