Acta Cryst. (2010). E66, m1320-m1321  [ doi:10.1107/S1600536810037736 ]

Bis(2-amino-4-methylpyrimidin-3-ium) trans-diaquabis(pyrazine-2,3-dicarboxylato)cobaltate(II) hexahydrate

H. Eshtiagh-Hosseini, M. Necas, N. Alfi and M. Mirzaei

Abstract: In the crystal structure of the mononuclear title compound, (C₅H₈N₃)₂[Co(C₆H₂N₂O₄)₂(H₂O)₂]·6H₂O or (ampymH)₂[Co(pyzdc)₂(H₂O)₂]·6H₂O (ampym = 2-amino-4-methyl pyrimidine, pyzdcH₂ = pyrazine-2,3-dicarboxylic acid), the Co^II ion is hexacoordinated by two (pyzdc)^2- groups in the equatorial plane and two water molecules in axial positions, giving an N₂CoO₄ bound set. The (pyzdc)^2- anion acts as a bidentate ligand through one carboxylate group O atom and pyrazine ring N atom. There are diverse N-H O and O-HO and O-HN hydrogen-bonding interactions, which lead to the formation of a three-dimensional supramolecular architecture. Off-set or slipped - stacking interactions are also observed between adjacent pyrimidine rings with face-to-face distances of 3.6337 (9) Å.

Online 30 September 2010

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