Crystal structure of di-μ-acetato-κ⁴ O: O'-bis{(acetato-κ² O, O')tetra-aqua-[1-(pyridin-2-yl-methylidene-κ N)-2-(pyridin-2-yl-κ N)hydrazine-κ N ¹]lanthanum(III)} dinitrate hemihydrate

In the binuclear title complex, [La₂(C₂H₃O₂)₄(C₁₁H₁₀N₄)(H₂O)₄](NO₃)₂·0.5H₂O, the two lanthanum ions are nine coordinate in a distorted trigonal-prismatic geometry. Each La^III ion is bonded to three N atoms of the Schiff base, 1-(pyridin-2-yl)-2-(pyridin-2-yl-methyl-ene)hydrazine and is coordinated by one acetate group, which acts in η ²-bidentate mode and two acetate groups that act in μ ₂-mode between the two La^III ions. Two η ¹-water mol-ecules complete the coordination sphere. All bond lengths in the coordination environment of the La^III ion are slightly larger than those observed in the isostructural Nd^III and Sm^III complexes. The La^III⋯La^III distance is 4.6696 (6) Å. In the crystal, extensive O-H⋯O hydrogen-bonding inter-actions involving the coordinated water mol-ecules and the non-coordinating nitrate anions, as well as the oxygen atoms of the acetate groups, generate an overall three-dimensional supra-molecular network.