Abstract
The ionic complexes [Ph4Sb · DMSO]2[OsBr6] (I) and [p-Tol4Sb · DMSO][p-Tol4Sb][OsBr6] (II) have been synthesized by the reaction between sodium hexabromoosmate and tetraphenyl- or tetra-para-tolylstibonium bromide in dimethyl sulfoxide (DMSO). According to X-ray diffraction data, the antimony atoms in [Ph4Sb · DMSO]+ and [p-Tol4Sb · DMSO]+ cations have a distorted trigonal bipyramidal coordination, and the pseudo-axial CSbO and pseudo-equatorial СSbС angles are 173.7(2)°, 172.8(3)° and 111.3(2)°‒121.8(2)°, 107.4(3)°‒120.3(3)°, respectively. In the tetrahedral [p-Tol4Sb]+ cation, the СSbС angles are 106.1(4)°‒111.3(4)°. In the octahedral [OsBr6]2‒ anions, the Os‒Br bond lengths are 2.4765(6)‒2.4981(6) A (I) and 2.4795(11)‒2.5063(11) A (II); the trans-BrOsBr angles are 180.00(2)° (I) and 178.83(4)°‒179.34(4)° (II).
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