trans-Diaqua­(malonato)(1,10-phenanthroline)nickel(II) trihydrate.

The title complex, [Ni(C3H2O4)(C12H8N2)(H2O)2]·3H2O, displays a distorted octa­hedral NiN2O4 coordination geometry, formed by a malonate dianion, a 1,10-phenanthroline ligand and two trans water mol­ecules. The Ni atom and one O atom, the latter from a solvent water mol­ecule, are located on twofold axes of symmetry. The crystal structure is stabilized by extensive O—H⋯O hydrogen-bonding inter­actions. [ABSTRACT FROM AUTHOR]