m-Xylylenediaminium di-aqua-bis-[di-hydrogen diphosphato(2-)]cobaltate(II) dihydrate.

In the title complex, (C8H14N2)[Co(H2P2O7)2(H2O)2]·2H2O, the Co(II) ion lies on an inversion center and is coordinated by two bidentate diphosphate ligands and two water mol-ecules in a slightly distorted octa-hedral coordination geometry. The m-xylylenediaminium cation is located on a twofold rotation axis. In the crystal, a three-dimensional supra-molecular assembly is constructed by O-H⋯O and N-H⋯O hydrogen bonds between the organic cations, complex anions and uncoordin-ated water mol-ecules.