K19Pb80 4(0 H )3 und KPb: Ein Oxid-Hydroxid und eine Zintl-Phase mit [Pb4]4_-Anionen K 19Pb80 4(0 H )3 and KPb: An Oxide-Hydroxide and a Zintl Phase with [Pb4]4“ Anions

K 1 9 Pbs0 4 ( 0 H ) 3 crystallizes in the cubic system with space group F m 3 m (a = 1622.7(4) pm; Z = 4). KPb crystallizes with the NaPb structure type (tetragonal, space group M j/acd, a = 1153.2(6) pm, c = 1886.8(9) pm, Z = 32). The crystal structures o f both com ­ pounds contain Zintl-anions [Pb4]4as characteristic building units, which in the Zintl phase are separated by potassium cations only. The oxide-hydroxide contains additional anions 0 2~ and O H ~ enclosed by potassium ions in an octahedral coordination. The oxygen centered octahedra form a three-dim ensional network of clusters [ ( 0 / 0 H ) 6 K ]9] (consisting o f six octahedra [ ( 0 /0 H ) K 6] sharing edges) and single octahedra [O K 6] connected by com ­ m on corners. The [Pb4]4tetrahedra occupy the voids within this framework.