PB(2)PDX(6) (X=CL,BR) - COMPOUNDS WITH EL ONGATED [PDX(6)] OCTAHEDRA

In contradiction to published data new compounds in the systems PbX(2) -PdX(2) (X = Cl, Br) with the formula Pb2PdCl6 (I) and Pb2PdBr6 (II) w ere found. These were synthesized by thermal treatment of the correspo nding mixtures of PbX(2) and PdX(2) (X = Cl, Pr). X-ray single crystal structure analysis shows isotypism of I and II, monoclinic, P2(1)/c ( No. 14), Z = 2, I: a = 9.037(2) Angstrom, b = 6.224(1) Angstrom, c = 8 .162(1) Angstrom, beta = 90.31(7)degrees, II: a = 9.512(7) Angstrom, b = 6.584(8) Angstrom, c = 8.383(3) Angstrom, beta = 90.07(5)degrees. S trongly elongated PdX(6) octahedra are found in the crystal structure. Additional characterization of the compounds was done by DTA, IR/RAMA N spectra and Pb-207 MAS NMR investigations. Remarcable low field shif ts were found for Pb-207.