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K 19 Pb8O 4 (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 14 1 /acd, a = 1153.2(6) pm. c = 1886.8(9) pm. Z = 32). The crystal structures of both com­pounds contain Zintl-anions [Pb 4 ] 4-  as characteristic building units, which in the Zintl phase are separated by potassium cations only. The oxide-hydroxide contains additional anions O 2-  and OH -  enclosed by potassium ions in an octahedral coordination. The oxygen centered octahedra form a three-dimensional network of clusters [(O/OH) 6 K 19 ] (consisting of six octahedra [(O/OH)K 6 ] sharing edges) and single octahedra [OK 6 ] connected by com­mon corners. Tlie [Pb 4 ] 4-  tetrahedra occupy the voids within this framework.

zeitschrift für naturforschung b

K 19 Pb 8 O 4 (OH) 3  und KPb: Ein Oxid-Hydroxid und eine Zintl-Phase mit [Pb 4 ] 4- -Anionen / K  19 Pb 8 O 4 (OH) 3  and KPb: An Oxide-Hydroxide and a Zintl Phase with [Pb 4 ] 4-  Anions