Freiburg 2024 – scientific programme

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MO: Fachverband Molekülphysik

MO 24: Poster: Experimental Techniques

MO 24.1: Poster

Thursday, March 14, 2024, 17:00–19:00, Tent C

Ionic Liquids with Three-Valent Cations: Spectroscopic Studies Towards Their Use as Reaction Media — •Max Scahdenfroh, Carina Allacher, Selina Reigl, Manuel Rothe, Werner Kunz, and Patrick Nürnberger — Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93040 Regensburg

Ionic liquids (ILs) are defined as salts with a melting point below 100 ^∘C [1]. ILs are multifaceted systems with highly customizable physical and chemical properties, and thus offer a plethora of applications. While classical ILs are often toxic and environmentally harmful, a new class of ILs was introduced in 2018 [2], which better satisfies the principles of Green Chemistry. These compounds rely on the COncept of Melting Point Lowering due to EThoxylation (COMPLET). More recently, this concept could be extended to three-valent cations [3].
Here, we present spectroscopic studies of ionic liquids containing Eu³⁺, Y³⁺, and La³⁺ cations. Combining excitation and emission spectroscopy, an energy transfer from the anionic ligand to the metal upon photoexcitation can be corroborated. This ligand-metal interaction may be exploited in photochemical organic synthesis by utilization of these ILs as solvent environment. The approach to combine catalyst and solvent in one compound could be beneficial for confinement-controlled synthesis and an alternative to conventional photocatalysts.
[1] H. Weingärtner, Angew. Chem. Int. Ed. 47, 654–670 (2008).
[2] E. Müller et al., J. Mol. Liq. 251, 61–69 (2018).
[3] M. Rothe et al., Chem. Eur. J., 27, 13052–13058 (2021).

Keywords: Photocatalyst; Cluster; Ionic Liquids; Rare Earth Metals