Noncovalent Interactions in Halogenated Pyridinium Salts of the Weakly Coordinating Anion [Al(OTeF₅)₄]⁻

Abstract

The synthesis and the first structural characterization of the halogenated pyridinium salts [C5F5NH]+, [C5F4ClNH]+, [(C5F5N)2H]+, [(C5Cl5N)2H]+ of the weakly coordinating anion (WCA) [Al(OTeF5)4]−, showing noncovalent interactions in the solid state, are presented. The salts were characterized by the multinuclear NMR and IR spectroscopy as well as X‐ray diffraction. Hirshfeld surface analysis and solid state structures reveal various intermolecular anion‐π and σ‐hole interactions between the corresponding halogenated pyridinium cations and the anion [Al(OTeF5)4]−.

[Xe(OTeF5)(pyF)]+: a strong oxidizing xenonium(ii) teflate cation with N-donor bases

“…Based on the literature-known synthesis of the [FXe(NC 5 F 5 )] + cation, starting from [HNC 5 F 5 ][AsF 6 ] and XeF 2 , 20 Xe(OTeF 5 ) 2 was reacted with our recently prepared Brønsted acid [HNC 5 F 5 ][Al(OTeF 5 ) 4 ]. 21 However, various attempts to obtain [Xe(OTeF 5 )(NC 5 F 5 )][Al(OTeF 5 ) 4 ] (1) with this method were unsuccessful, resulting in multiple teflate- and pentafluoropyridine-containing species. Unfortunately, no xenon-compound was observed by 129 Xe NMR spectroscopy.…”