Abstract
Abstract K19Pb8O4(OH)3 crystallizes in the cubic system with space group Fm3m (a = 1622.7(4) pm: Z = 4). KPb crystallizes with the NaPb structure type (tetragonal, space group 141/acd, a = 1153.2(6) pm. c = 1886.8(9) pm. Z = 32). The crystal structures of both compounds contain Zintl-anions [Pb4]4- as characteristic building units, which in the Zintl phase are separated by potassium cations only. The oxide-hydroxide contains additional anions O2- and OH- enclosed by potassium ions in an octahedral coordination. The oxygen centered octahedra form a three-dimensional network of clusters [(O/OH)6K19] (consisting of six octahedra [(O/OH)K6] sharing edges) and single octahedra [OK6] connected by common corners. Tlie [Pb4]4- tetrahedra occupy the voids within this framework.
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