The determined structure of the title compound C₂₄H₂₀Ni₂N₈O₂₀ consists of the mononuclear trans-[Ni(pyzdc)₂(H₂O)₂], (pyzdc = pyrazine-2,3- dicarboxylate). The Ni(II) atom is hexa-coordinated by two (pyzdcH)^- groups and two water molecules. The coordinated water molecules are in trans-diaxial positions and the (pyzdcH)^- anion 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 interactions such as O—H···N and O—H···O contacts, which lead to the formation of a three-dimensional supramolecular architecture_.

KEY WORDS: Ni(II), Pyrazine-2,3-dicarboxylic acid, Coordination chemistry, Supramolecular  chemistry, Hydrogen bond, Proton transfer

DOI: http://dx.doi.org/10.4314/bcse.v26i1.15