Crystal structure of new palladium fluorides A(2)PdF(6) and AA ' PdF6 (A(2+) = Ba2+, Sr2+, Pb2+)

A new series of palladium (II) fluorides has been prepared. The A(2)PdF(6) compounds crystallize in the orthorbombic space group Cmca. The structure o f Ba2PdF6 (a=17.09(2) Angstrom, b = 6.163(2) Angstrom, c = 6.158(1) Angstro m, Z = 4) has been refined from single crystal data to conventional R-1 = 0 .0325 (wR(2) = 0.0948) for 661 independent reflections. A Rietveld analysis of BaSrPdF6 and refinement of the lattice parameters of Pb2PdF6 have confi rmed the same cationic distribution. Pd-II ions are fourfold-coordinated to fluorine. The isolated [PdF4](2-) square-planes form layers, perpendicular to the a-axis, interleaved by bilayers of [AF(8)](6-) antiprisms. (C) 1999 Academic Press.