Bromoantimonates with bis(pyridinium)-type dications obtained via oxidation by dibromine: Diverse structural types and features of interactions pattern

Bromoantimonate(III) species, which can be generated in solution by reaction of Sb2O3 and HBr, can be oxidized by Br-2 into mixed-valence complexes or bromoantimonates(V). The outcome of these reactions governs by the nature of cation which salt is used for isolation of solid complexes. Using bromides of three 1,n-bis(pyridinium)alkane cations (PyCn, where X = 2, 3 and 4), we isolated three complexes: (PyC2){[SbBr6](Br-3)} (1), (PyC3)(2)[Sb2Br9][SbBr6] (2) and (PyC4){[SbBr6](Br-3)} (3), respectively. Their structures were determined by X-ray diffractometry. For 1 and 3, the energies of non-covalent interactions between tribromide units and [SbBr6](-) were estimated using DFT calculations. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

Bromoantimonate(III) species generated in solution by reaction of Sb2O3 and HBr can be oxidized by Br-2 into mixed-valence complexes. The outcome of these reactions is influenced by the nature of cation used for isolation of solid complexes, and the structures of the complexes were determined by X-ray diffractometry.