Tris[tri-phenyl-anti-mony(V)]hexa(μ-oxido)-tellurium(VI): a mol-ecular complex with six Te-O-Sb bridges

Abstract

In the structure of the title compound [systematic name hexa-μ-oxido-1:2κ⁴ O:O;1:3κ⁴ O:O;1:4κ⁴ O:O-nona-phenyl-2κ³ C,3κ³ C,4κ³ C-tri-anti-mony(V)tel-lur-ium(VI)], [Sb₃Te(C₆H₅)₉O₆], the hexa-oxidotellurate(VI) ion is coordinated to three Sb^V ions via pairs of cis-positioned O atoms to form a discrete mol-ecular unit. The Te^VI and Sb^V central ions exhibit distorted octa-hedral [TeO₆] and distorted trigonal-bipyramidal [SbC₃O₂] coordination geometries, respectively. The linking of these polyhedra, by sharing the dioxide edges, results in the Te-based octa-hedron having a mer-configuration. The packing of the mol-ecules is dominated by C-H⋯O hydrogen bonding and weak dispersion forces, with a minor contribution from C-H⋯π bonds and π-π stacking inter-actions. According to the Hirshfeld surface analysis, the contributions of the H⋯H, H⋯C/C⋯H and H⋯O/O⋯H contacts are 58.0, 32.6 and 7.8%, respectively. The title structure provides a model for the bonding of triorgano-anti-mony dications to octa-hedral oxoanions, and the observed doubly bridged motifs, Te(μ-O)₂Sb, may find application in the functionalization of polyoxometalate species.

Keywords: Hirshfeld surface; crystal structure; hexa­oxido­tellurate(VI); oxide clusters; poly­oxo­anions; triorgano­anti­mony(V).