Syntheses and Structures of the Hexacoordinated Antimony Complexes: Ph3(C2H4O2)Sb⋅⋅⋅DMSO, (3-FC6H4)3(C2H4O2)Sb⋅⋅⋅DMSO, and (4-MeC6H4)3(C6H4O2)Sb⋅⋅⋅DMSO

Abstract

Complexes Ph₃(C₂H₄O₂)Sb⋅⋅⋅DMSO (I), (3-FC₆H₄)₃(C₂H₄O₂)Sb⋅⋅⋅DMSO (II), and (4‑MeC₆H₄)₃-(C₆H₄O₂)Sb⋅⋅⋅DMSO (III) are synthesized by the reactions of triarylantimony with ethylene glycol or pyrocatechol in the presence of an oxidant and dimethyl sulfoxide (DMSO). According to the X-ray diffraction analysis data, the Sb atoms in the complexes have the coordination of a distorted octahedron with the chelate cycle (C₂H₄O₂ or C₆H₄O₂) and two aryl groups in the equatorial plane, and the third aryl group and DMSO molecule occupy the axial positions. The СSbO axial angles are 173.59(5)° (I); 175.96(8)°, 175.93(8)° (II); and 174.07(8)° (III). The Sb⋅⋅⋅О=SMe₂ distances (2.346(2)−2.407(2) Å) considerably exceed the sum of covalent radii of the atoms.