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

• Main Authors: Hossein Aghabozorg, Jafar Attar Gharamaleki, Shirin Daneshvar, Mohammad Ghadermazi, Hamid Reza Khavasi
• Format: Article
• Language: English
• Published: International Union of Crystallography 2008-01-01
• Series: Acta Crystallographica Section E
• Online Access: http://scripts.iucr.org/cgi-bin/paper?S1600536807066032

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 CoII 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—H...O, N—H...N, O—H...N and C—H...O hydrogen bonding in the structure, as well as π–π stacking between (pydc)2− ligands with an interplanar distance of 3.484 (15) Å.