Crystal structure of di-μ-acetato-κ4O:O′-bis{(acetato-κ2O,O′)tetra­aqua­[1-(pyridin-2-yl­methylidene-κN)-2-(pyridin-2-yl-κN)hydrazine-κN1]lanthanum(III)} dinitrate hemihydrate

In the title Schiff base binuclear lanthanum(III) complex, the two metal ions have the same environment and the La^III ion is coordinated by three soft nitro­gen atoms from the Schiff base ligand, four hard oxygen atoms from carboxyl­ate co-ligands and two water oxygen atoms. Each La^III ion is nine coordinate and its environment is best described as a tricapped trigonal–prismatic geometry.

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-yl­methyl­ene)hydrazine and is coordinated by one acetate group, which acts in η²-bidentate mode and two acetate groups that act in μ₂-mode between the two La^III ions. Two η¹-water mol­ecules 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 inter­actions involving the coordinated water mol­ecules and the non-coordinating nitrate anions, as well as the oxygen atoms of the acetate groups, generate an overall three-dimensional supra­molecular network.