(2,9-Dimethyl-1,10-phenanthroline)(4-hydroxy-pyridine-2,6-dicarboxyl-ato)copper(II) trihydrate.

In the title complex, [Cu(C(7)H(3)NO(5))(C(14)H(12)N(2))]·3H(2)O, there are two independent neutral mol-ecules of the Cu complex along with six mol-ecules of water of hydration in the asymmetric unit. The Cu(II )atoms in each complex adopt a distorted square-pyramidal coordination geometry being penta-coordinated by one N and two O atoms of 4-hydroxy-pyridine-2,6-dicarboxyl-ate anions and two N atoms of 2,9-dimethyl-1,10-phenanthroline (dmp) molecules. In the crystal structure, there are O-H⋯O and C-H⋯O hydrogen bonds and five π-π stacking inter-actions with centroid-centroid distances in the range 3.620 (1)-3.712 (1) Å. In addition, a C-H⋯π inter-action between a heterocyclic ring of dmp is observed to reinforce the crystal cohesion.