The ordered hydrocerussite-type structure of (PbCO3)2.BaF2.
Single crystals of synthetic (PbCO(3))(2).BaF(2), bis[lead(II) carbonate] barium difluoride, have been grown under hydrothermal conditions. The compound crystallizes in the ordered hydrocerussite [(PbCO(3))(2).Pb(OH)(2)] structure and can be derived from a close packing of the metal atoms with a stacking sequence of [c(h)(2)](3) along the c axis. O and F atoms are situated approximately in the tetrahedral voids, resulting in the formation of a slightly distorted [BaF(6)O(6)] icosahedron and a [1+6+3]-coordinate Pb atom, with one short bond to F, six bonds to O and three longer bonds to additional O atoms. The carbonate group deviates only slightly from the geometry of an equilateral triangle.
Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, Vienna University of Technology, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria. mweil@mail.zserv.tuwien.ac.at
Matthias
M
Weil