Bis(2-amino-4-methylpyridinium) trans-diaquabis(pyrazine-2,3-dicarboxylato)-cuprate(II) hexahydrate

The title compound, (C6H9N2) 2[Cu(C6H2N2O4) 2(H2O)2]·6H2O, consists of a mononuclear trans-[Cu(pzdc)2(H2O)2] 2- dianion (pzdc is pyrazine-2,3-dicarboxylate) and two [ampyH] + cations (ampy is 2-amino-4-methyl-pyridine) with six water molecules of solvation. The CuII atom is hexa-coordinated by two pzdc groups and two water molecules. The coordinated water molecules are in trans-diaxial positions and the pzdc dianion acts as a bidentate ligand through an O atom of the carboxylate group and the N atom of the pyrazine ring. There are diverse hydrogen-bonding inter-actions, such as N-H⋯O and O-H⋯O contacts, which lead to the formation of a three-dimensional supra-molecular architecture.