A Bidentate Antimony Pnictogen Bonding Host System

Abstract

AbstractA bidentate pnictogen bonding host‐system based on 1,8‐diethynylanthracene was synthesized by a selective tin‐antimony exchange reaction and investigated regarding its ability to act as a Lewis acidic host component for the complexation of Lewis basic or anionic guests. In this work, the novel C≡C−Sb(C2F5)2 unit was established to study the potential of antimony(III) sites as representatives for the scarcely explored pnictogen bonding donors. The capability of this partly fluorinated host system was investigated towards halide anions (Cl−, Br−, I−), dimethyl chalcogenides Me2Y (Y=O, S, Se, Te), and nitrogen heterocycles (pyridine, pyrimidine). Insights into the adduct formation behavior as well as the bonding situation of such E⋅⋅⋅Sb−CF moieties were obtained in solution by means of NMR spectroscopy, in the solid state by X‐ray diffraction, by elemental analyses, and by computational methods (DFT, QTAIM, IQA), respectively.