title: Pb(6)Co(9)(TeO(6))(5).
abstract: Pb(6)Co(9)(TeO(6))(5), hexa-lead(II) nona-cobalt(II) penta-tellur-ate(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 octa-hedral 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 [CoO(6)] and [TeO(6)] octa-hedra, with 1/6 of the octa-hedral holes not occupied. The second layer, situated at z ≃ 0, consist of an alternating arrangement of Pb(II) atoms and of double octa-hedra that are made up from face-sharing [CoO(6)] and [TeO(6)] octa-hedra. The two types of layers are linked together through corner-sharing of [CoO(6)] and [TeO(6)] octa-hedra. The Pb(II) atoms are situated in the cavities of the framework and are stereochemically active with one-sided [4]- and [6]-coordinations, respectively.
authors.affiliation: Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, Vienna University of Technology, Getreidemarkt 9/164-SC, A-1060 Vienna,  Austria.
authors.forename: Christine
authors.initials: C
authors.lastname: Artner
authors.forename: Matthias
authors.initials: M
authors.lastname: Weil