Crystal structure and magnetic properties of an octacyanometalate-based three-dimensional tungstate(V)-manganese(II) bimetallic assembly

A single crystal of the title compound [Mn-6(II)(H2O)(9){W-V(CN)(8)}4 . 13H(2)O](n) was synthesized in a hot aqueous solution containing octacyanotungstate, Na-3[W(CN)(8)]. 3H(2)O, and Mn(ClO4)(2). 6H(2)O. The compound crystallized in the monoclinic system, space group P2(1)/c with cell constants a 15.438(2) Angstrom, b= 14.691(2) Angstrom, c = 33.046(2) Angstrom, beta = 94.832(9)degrees, and Z = 4. The crystal consists of a W-V-CN-Mn-II linked three-dimensional network [{Mn-II-(H2O)}(3){Mn-II(H2O)(2)}(3){W-V(CN)(8)}(4)](n) and H2O molecules as crystal solvates. There are two kinds of W sites: one is close to a dodecahedron geometry with six bridging and two terminal CN ligands; the other is close to a bicapped trigonal prism with seven bridging and one terminal CN Iigands. The field-cooled magnetization measurement showed that the compound exhibits a spontaneous magnetization below T-c = 54 K. Further magnetization measurements on the field dependence reveal it to be a ferrimagnet where all of the Mn (II) ions are antiparallel to all the W-V ions.