Features of the formation of halide complexes of platinum metals with Co(III) ammonia

Crystalline powders of double complex salts of various compositions have been isolated by the interaction of solutions containing [Co(NH3)6]3+ cations and [MHal4]2− (M = Pt(II), Pd(II); Hal = Cl−, Br−) anions. It has been experimentally found that the replacement of chloride ions in the Co–Pd system with bromide ions leads to the formation of compounds with a Co : Pd = 2 : 3. In the presence of sulfate ions, crystals of a compound of the composition {[Co(NH3)6](SO4)2[Co(NH3)6]}[PdBr4]. The compound was isolated for the first time and characterized by elemental analysis, X-ray diffraction, IR spectroscopy, and X-ray diffraction (CCDC 2355175). The structures were investigated by the DFT/PBE0 method in the def2 tzvp basis. Molecular graphs of compounds have been constructed and indicators of non-valent interactions have been identified as part of the topological analysis of electron density. Their energies and the total effect, which can have a strong electrostatic and induction effect on the formation of crystal structures, are approximately estimated.