Penta­aqua­tri-μ(3)-hydroxido-tris­(imino­diacetato)-μ(3)-oxido-tetra­hedro-calcium(II)tricobalt(III) 2.54-hydrate

In the title compound, [CaCo(3)(C(4)H(5)NO(4))(3)(OH)(3)O(H(2)O)(5)]·2.54H(2)O, the Co atom is octa­hedrally coordinated by one imino­diacetate (ida) dianion as a facial O,N,O′-tridentate ligand, two μ(3)-OH groups and one μ(3)-O ligand, forming an partial Co(3)O(4) cubane cluster. This unit coordinates to a Ca(II) cation in an O,O′,O′′-tridentate fashion, generating a distorted CaCo(3)O(4) cubane-type cluster. The Ca—μ(3)-O distances [2.429 (5)–2.572 (6) Å] are much longer than the Co—μ(3)—O bonds [1.895 (5)–1.941 (5) Å]. The Ca(II) cation is also coord­inated by five water mol­ecules with Ca—O distances in the range 2.355 (6)–2.543 (6) Å. There are three additional uncoordinated water mol­ecules in the asymmetric unit, the occupancy of which refined to 0.54 (3). In H(2)O (or D(2)O), the title complex hydrolyses to Ca(2+) (aq) cations and [Co(3)(ida)(3)(μ(2)-OH)(3)(μ(3)-O)](2−) anions.