The crystal structure of the selenide-based synthetic sulfosalt CuPbSb3Se6.

Single crystals of copper lead tri-anti-mony hexa-selenide, CuPbSb3Se6, were obtained as a minor phase during systematic studies of the formation conditions of selenide-based sulfosalts. The crystal structure is an unusual representative of the family of sulfosalts. Instead of the expected galena-like slabs with octa-hedral coordination, it features mono and double-capped trigonal-prismatic (Pb), square-pyramidal (Sb) and trigonal-bipyramidal (Cu) coordination. All metal positions are occupationally and/or positionally disordered.

The channel structure of trithallium penta-anti-m-on-ate(V), Tl3Sb5O14.

Single crystals of Tl3Sb5O14 were grown by solid-state reaction in a corundum crucible under air (1273 K, 12 h). The structure was determined by single-crystal X-ray diffraction. It is isotypic to the K3Sb5O14, Rb3Sb5O14 and Cs3Sb5O14 analogues with ortho-rhom-bic Pbam symmetry and cell parameters a = 24.2899 (9) Å, b = 7.1931 (3) Å, c = 7.4182 (3) Å. The Sb atoms form irregular [SbO6] octa-hedra, which are linked via edges and corners into a triperiodic network. The Tl+ ions are located in distinct channels of the network extending along [010] and [001].