Investigation of Bis(Perfluoro‐tert‐Butoxy) Halogenates(I/III)

다국어 초록 (Multilingual Abstract)

A systematic study of halogenate(I/III) anions with polyatomic ligands is presented. The bis(perfluoro‐tert‐butoxy) halogenates(I) [X(OC4F9)2]−, X=Cl, Br, I, of chlorine, bromine, and iodine are prepared as their tetraethylammonium salts and characterized with IR, Raman, and NMR spectroscopic methods, as well as single‐crystal X‐ray diffraction analyses. Spectroscopical data are supported by quantum‐chemical calculations. Additionally, the bonding situation of the species in question are analyzed and discussed. Furthermore, the oxidation to the corresponding halogenate(III) derivatives was studied. For [Br(OC4F9)2]−, oxidation with elemental fluorine gave [BrF2(OC4F9)2]−. Iodide was directly oxidized by ClOC4F9 to the IIII species [I(OC4F9)4]−, which is a surprisingly inert anion that might be used as a weakly coordinating anion (WCA) in the future. For [Cl(OC4F9)2]−, the decomposition products of the synthetic approaches towards a chlorine(III) system were analyzed.
Chemistry with halogens in positive oxidation states, especially the lighter halogens, is challenging due to their high oxidation potential. An ensemble of halogen +I and +III compounds with a comparatively large ligand system was synthesized and characterized with experimental and quantum‐chemical methods. This study is envisioned as an example for the diverse but sometimes overlooked chemistry of group 17.