Abstract
Pb6Co9(TeO6)5, hexalead(II) nonacobalt(II) pentatellurate(VI), is isotypic with its nickel(II) analogue. The asymmetric unit contains two Pb atoms (site symmetries .2., ..2), four Co atoms (..2, ..2, 3.., 3.2) two Te atoms (..2, 3..) and six O atoms (all in general positions), with the Te and Co sites in octahedral coordination environments. The crystal structure can be subdivided into two types of layers parallel to (001). The first layer at z ≃ 0.25 is made up of edge-sharing [CoO6] and [TeO6] octahedra, with 1/6 of the octahedral holes not occupied. The second layer, situated at z ≃ 0, consist of an alternating arrangement of PbII atoms and of double octahedra that are made up from face-sharing [CoO6] and [TeO6] octahedra. The two types of layers are linked together through corner-sharing of [CoO6] and [TeO6] octahedra. The PbII atoms are situated in the cavities of the framework and are stereochemically active with one-sided [4]- and [6]-coordinations, respectively.
Highlights
The crystal structure can be subdivided into two types of layers parallel to (001)
Reviews on the crystal chemistry of oxotellurates(VI) and of the geometry of [CoIIO6] polyhedra are given by Levason
The X-ray centre of the Vienna University of Technology is acknowledged for providing access to the single-crystal diffractometer
Summary
Pb6Co9(TeO6), hexalead(II) nonacobalt(II) pentatellurate(VI), is isotypic with its nickel(II) analogue. The crystal structure can be subdivided into two types of layers parallel to (001). [TeO6] octahedra, with 1/6 of the octahedral holes not occupied. The second layer, situated at z ’ 0, consist of an alternating arrangement of PbII atoms and of double octahedra that are made up from face-sharing [CoO6] and [TeO6]. The two types of layers are linked together through corner-sharing of [CoO6] and [TeO6] octahedra. The PbII atoms are situated in the cavities of the framework and are stereochemically active with one-sided [4]- and [6]-coordinations, respectively. For the isotypic nickel analogue, see: Wedel et al (1998). Reviews on the crystal chemistry of oxotellurates(VI) and of the geometry of [CoIIO6] polyhedra are given by Levason (1997) and Wildner (1992), respectively.
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