Synthesis and structure of osmium complexes: [Ph4Sb]2+ [OsCl6]2–, and [p-Tol4Sb]2+[OsCl6]2—

Abstract

The reaction of sodium hexachloroosmate with tetraphenyl- or tetra(para-tolyl)stibonium chloride in dimethyl sulfoxide gave the complexes [Ph₄Sb]₂[OsCl₆] (I) and [p-Tol₄Sb]₂[OsCl₆] (II). According to X-ray diffraction data, the CSbC angles in the tetrahedral cations [Ph₄Sb]⁺ and [p-Tol₄Sb]⁺ are 105.97(17)°–117.98(16)° in I and 103.1(3)°–118.0(2)° in II; the Sb–C bond lengths vary in the ranges of 2.090(4)–2.104(4) Å (I) and 2.086(6)–2.107(7) Å (II). In the octahedral anions [OsCl6]2–, the Os–Cl bond lengths are 2.3364(10)–2.3435(12) Å (I) and 2.3159(16)–2.3361(19) Å (II) (CIF files CCDC no. 1000137 (I), 1010809 (II)).