Bis(9-amino­acridinium) bis­(pyridine-2,6-dicarboxyl­ato)cuprate(II) trihydrate

The asymmetric unit of the title compound, (C(13)H(11)N(2))(2)[Cu(C(7)H(3)NO(4))(2)]·3H(2)O, consists of one [Cu(pydc)(2)](2−) dianion (pydc is pyridine-2,6-dicarboxyl­ate), two 9-amino­acridinum monocations and three uncoordinated water mol­ecules. The Cu(II) atom is coordinated by two pydc dianions acting as tridentate ligands, and forming five-membered chelate rings with copper(II) as the central atom. The Cu(II) atom is surrounded by four O atoms in the equatorial plane and two pyridine N atoms in axial positions, resulting in a distorted octa­hedral coordination geometry. In the crystal, there are two types of O—H⋯O and N—H⋯O hydrogen-bonding synthons linking the anionic and cationic fragments and the water mol­ecules, namely R (4) (4)(16), and R (4) (2)(8). There are also weak C—H⋯O hydrogen bonds, π–π stacking inter­actions [the shortest centroid–centroid distance is 3.350 (2) Å], and a C—O⋯π inter­action [O⋯centroid distance = 3.564 (2) Å], which connect the various components into a three-dimensional network.