(IUCr) Crystallography Journals Online

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Acta Cryst. (2008). E64, m187-m188 [ doi:10.1107/S1600536807066032 ]

Bis(2,4,6-triamino-1,3,5-triazin-1-ium) hexaaquacobalt(II) bis[bis(pyridine-2,6-dicarboxylato)cobaltate(II)] tetrahydrate

H. Aghabozorg, J. Attar Gharamaleki, S. Daneshvar, M. Ghadermazi and H. R. Khavasi

Abstract: The title compound, (C₃H₇N₆)₂[Co(H₂O)₆][Co(C₇H₃NO₄)₂]₂·4H₂O, or (tataH)₂[Co(H₂O)₆][Co(pydc)₂]₂·4H₂O (where tata is 2,4,6-triamino-1,3,5-triazine and pydc is pyridine-2,6-dicarboxylic acid), was obtained by reaction of Co(NO₃)₂·6H₂O with the proton-transfer compound (tataH)₂(pydc) in aqueous solution. The [Co(pydc)₂]^2- anion is a six-coordinate Co^II complex with a distorted octahedral coordination geometry. The structure also contains hexaaquacobalt(II) cations (site symmetry $\\overline{1}$ ), (tataH)⁺ cations and uncoordinated water molecules. The two(pydc)^2- ligands in each [Co(pydc)₂]^2- anion are almost perpendicular to each other [dihedral angle between their mean planes = 82.3 (1)°]. There is extensive O-HO, N-HN, O-HN and C-HO hydrogen bonding in the structure, as well as [pi] - [pi] stacking between (pydc)^2- ligands with an interplanar distance of 3.484 (15) Å.

Online 18 December 2007