STRUCTURE OF THE DECAHYDRATED OCTAACETATE OF DINEODYMIUM(III) AND COBALT(II)

Octakis(mu-acetato-O:O')-decaaquacobalt-(II)dineodymium(III), [CoNd2(mu-C2H3O2)8(H2O)10], M(r) = 999.92, triclinic, P1BAR, a = 8.243 (2), b = 10.368 (3), c = 11.497 (3) angstrom, alpha = 111.64 (1), beta = 107.94 (1), gamma = 93.45 (1)degrees, V = 851 (1) angstrom 3, Z = 1, D(x) = 1.95 Mg m-3, Mo K-alpha, lambda = 0.71069 angstrom, mu = 3.58 mm-1, F(000) = 495, room temperature, R = 0.024 for 6789 unique reflections. Crystal growth was by slow evaporation from an aqueous solution of the simple acetates. Chains are built up from distorted [NdO7(OH2)2] tricapped trigonal prisms and almost regular (CoO6) octahedra (O atoms from acetate bidentate bridging groups). The [NdO7(OH2)2] units share an edge (two O atoms from two acetate groups). The resulting dimeric entities are linked one to another through one (CoO6) octahedron, which shares one corner with each prism. This gives an (NdNdCo) sequence in the chains, which are interconnected by rather weak hydrogen bonds involving the six lattice water molecules.