ChemInform Abstract: Tellurium Polycations Stabilized by Halogenobismutates ‐ Syntheses and Crystal Structures of Te4(Bi6Cl20) and Te4(Bi2Br8).

Abstract

Tellurium Polycations Stabilized by Halogenobismutates -Syntheses and CrystalStructures of Te4(Bi6Cl20) and Te4(Bi2Br8). -Black single crystals of the title compounds are prepared in ¿ 40% yield by reaction of Te, TeX4, and BiX3 (X: Cl, Br) in sealed evacuated glass ampoules in a temperature gradient 170 → 100 . degree.C. As revealed from the single-crystal XRD data, the compounds, which both adopt the triclinic space group P1 with Z = 2, are built-up from discrete Te2+4 cations and polymeric (BiCl20)2and (Bi2Br8)2-anions, respectively. The (Bi6Cl20)2-anion consists of a twodimensional sheet of distorted corner-and edge-sharing BiCl6 octahedra with attached BiCl3 groups. In the bromobismutate anions, the BiBr6 octahedra share cis-edges, forming infinite zigzag chains. -(BECK, J.; KASPER, M.; STANKOWSKI, A.; Chem.