(2,2'-Diamino-4,4'-bi-1,3-thiazole-kappa2N3,N3')(oxydiacetato-kappa3O,O',O")copper(II) monohydrate.

The title compound, [Cu(C(4)H(4)O(5))(C(6)H(6)N(4)S(2))].H(2)O, displays a square-pyramidal coordination geometry. The tridentate oxydiacetate dianion chelates the Cu(II) atom in the facial mode. The large difference [0.487 (4) A] between the longest Cu-O distance in the basal plane and that in the apical direction correlates with the small displacement of the Cu(II) atom [0.0576 (13) A] from the basal plane towards the apex of the square pyramid. The intermolecular hydrogen-bonding network results in a closely overlapped arrangement of the coordination basal plane and the thiazole ring of a neighboring molecule.