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

Abstract

The asymmetric unit of the title compound, (C13H11N2)2[Cu(C7H3NO4)2]·3H2O, consists of one [Cu(pydc)2]2− dianion (pydc is pyridine-2,6-dicarboxylate), two 9-aminoacridinum monocations and three uncoordinated water molecules. The CuII 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 CuII 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 R44(16), and R42(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.