K ···Cπ and K ···F Non-Covalent Interactions in π-Functionalized Potassium FluoroalkoxidesReportar como inadecuado

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1 ISCR - Institut des Sciences Chimiques de Rennes

Abstract : Secondary interactions stabilize coordinatively demanding complexes of s-block metals. The structures of potassium fluoroalkoxides that, in addition to intra- and intermolecular K+F contacts, also exhibit K+C interactions with tethered ligands, are reported. A potassium-arene, a rare potassium-alkyne, and a potassium-olefin complex have been prepared by deprotonation of functionalized ,-bistrifluoromethylalcohols with KNSiMe2R2. They all feature a cuboid K4O4 core with 3-bridging O atoms, and multiple stabilizing K+F contacts in the range 2.71-3.33 angstrom. The potassium-arene complex shows 2, 3, and 6 K+Carene interactions in the range 3.35-3.47 angstrom. The potassium-alkyne and potassium-olefin compounds are stabilized by 2 interactions with the unsaturated carbon-carbon bond, in the range 3.17-3.49 angstrom and 3.15-3.19 angstrom, respectively. Comparison with the parent complex devoid of a flanking ligand illustrates the role of K+C interactions.

Keywords : potassium-c pi interactions ligands alkoxide ligands potassium complexes secondary interactions potassium-fluorine contacts

Autor: Sorin-Claudiu Roşca - Hanieh Roueindeji - Vincent Dorcet - Thierry Roisnel - Jean-François Carpentier - Yann Sarazin -

Fuente: https://hal.archives-ouvertes.fr/


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