Syntheses, Structures, and Characterization of New Lead(II)−Tellurium(IV)−Oxide Halides: Pb<sub>3</sub>Te<sub>2</sub>O<sub>6</sub>X<sub>2</sub> and Pb<sub>3</sub>TeO<sub>4</sub>X<sub>2</sub> (X = Cl or Br)
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The syntheses, structures, and characterization of four new lead(II)−tellurium(IV)−oxide halides, Pb3Te2O6X2 and Pb3TeO4X2 (X = Cl or Br) are reported. The materials are synthesized by solid-state techniques, using Pb3O2Cl2 or Pb3O2Br2 and TeO2 as reagents. The compounds have three-dimensional structural topologies consisting of lead−oxide halide polyhedra connected to tellurium oxide groups. In addition, the Pb2+ and Te4+ cations are in asymmetric coordination environments attributable to their stereoactive lone pair. We also demonstrate that Pb3Te2O6X2 and Pb2TeO4X2 can be interconverted reversibly through the loss or addition of TeO2. X-ray data: Pb3Te2O6Cl2, monoclinic, space group C2/m (No. 12), a = 16.4417(11) Å, b = 5.6295(4) Å, c = 10.8894(7) Å, β = 103.0130(10)°, Z = 4; Pb3Te2O6Br2, monoclinic, space group C2/m (No. 12), a = 16.8911(8) Å, b = 5.6804(2) Å, c = 11.0418(5) Å, β = 104.253(2)°, Z = 4; Pb3TeO4Cl2, orthorhombic, space group Bmmb (No. 63), a = 5.576(1) Å, b = 5.559(1) Å, c = 12.4929(6) Å, Z = 4; Pb3TeO4Br2, orthorhombic, space group Bmmb (No. 63), a = 5.6434(4) Å, b = 5.6434(5) Å, c = 12.9172(6) Å, Z = 4.
