Monoprotonated Dimethyl Sulfoxide, [HOSMe₂]⁺: Synthesis, Crystal Structure, Spectroscopic and Theoretical Studies of [HOSMe₂]₂[OsCl₆] . 2H₂O

Complex [H(dmso)](2)[(OsCl6)-Cl-IV] . 2H(2)O (1) was synthesized by refluxing of [H(dmso)(2)](2)[OsCl6] in concentrated HCl and characterized by the IR and UV/Vis spectroscopy and X-ray powder and single-crystal diffraction studies. In this complex, rare highly electrophilic [Me2S=O...H](+) cation is stabilized by multiple chalcogen bonds including bifurcated S...(Cl)(3) and S...Cl non-covalent interactions. DFT calculations and topological analysis of the electron density distribution within the formalism of Bader's theory (QTAIM method) support the presence of intermolecular non-covalent interactions S...Cl and O...Cl in the solid state.