Syntheses and Crystal Structures of Two Cyano-bridged Bimetallic Complexes [Ce（DMSO）4（H2O）3Fe（CN）6]·H2O and [La（DMSO）4（H2O）3Co（CN）6]·H2O（DMSO = Dimethylsulfoxide）

Two new bimetallic cyano-bridged complexes [Ce(DMSO)4(H2O)3Fe(CN)6]·H2O 1 and [La(DMSO)4(H2O)3Co(CN)6]·H2O 2 have been prepared by the ball milling reaction me- thod and structurally characterized by X-ray single-crystal structure analyses. Crystallographic data for 1: C14H32CeFeN6O8S4, Mr = 736.67, monoclinic, space group P21/n, a = 14.952(1), b = 13.7276(9), c = 15.392(1) A, β = 108.288(1)°, V = 2999.6(4) ·3, Z = 4, Dc = 1.631 g/cm3, μ = 2.304 mm–1, F(000) = 1480, R = 0.0593 and wR = 0.1611; and those for 2: C14H32CoLaN6O8S4, Mr = 738.54, monoclinic, space group P21/n, a = 14.945(3), b = 13.731(3), c = 15.300(3) ·, β = 107.806(1)°, V = 2989.3(11) ·3, Z = 4, Dc = 1.641 g/cm3, μ = 2.288 mm–1, F(000) = 1480, R = 0.0383 and wR = 0.1132. In both complexes the lanthanide ion is eight-coordinated in a square antiprism arrangement, and the Fe(III) or Co(III) ion in a nearly regular octahedral environment. The [LnM(CN)6(DMSO)4(H2O)3]·H2O (Ln = Ce and M = Fe for 1; Ln = La and M = Co for 2) species are held together via hydrogen bonds by coordinated water molecules, lattice water molecules and nitrogen atoms of cyanide groups to form a three-dimensional framework.