[4,4′-(Ethane-1,2-diyldinitrilo)bis(pent-2-en-2-olato)]copper(II) 0.25-hydrate

In the title compound, [Cu(C12H18N2O2)]·0.25H2O, the coordination of the O,N,N′,O′-tetradentate ligand results in a cis-CuN2O2 square-planar geometry for the metal ion and the presence of two six-membered and one five-membered chelate rings. The complete complex molecule is close to planar (r.m.s. deviation = 0.047 ). The uncoordinated water molecule (O-atom site symmetry 2) was modelled as half occupied. In the crystal, C—H...Ow and Ow—H...O (w = water) hydrogen bonds link the components into layers parallel to ab plane.