Acta Cryst. (2007). E63, m2037-m2038  [ doi:10.1107/S1600536807031169 ]

Bis[tris(oxamide dioxime-²N,N')cobalt(III)] oxalate bis(sulfate) dodecahydrate

M. M. Belombe, J. Nenwa, G. Bebga, B. P. T. Fokwa and R. Dronskowski

Abstract: In the title compound, [Co(C₂H₆N₄O₂)₃]₂(C₂O₄)(SO₄)₂12H₂O, the Co³⁺ ion adopts a distorted octahedral coordination involving six imino N atoms of three bidentate oxamide dioxime ligands. The oxalate ion is centrosymmetric. The bulk structure is consolidated by a network of O-HO and N-HO hydrogen bonds, interconnecting the building blocks in such a manner that the framework delineates infinite channels parallel to [100]. The 12 water molecules are lodged inside the channels, six of them being O-HO and N-HO bonded to the ionic species, whilst the other six, located along the central axis of the channel, form infinite cyclohexameric water tapes. Two of the water molecules are disordered over two sites, in 0.786 (7):0.214 (7) and 0.637 (8):0.363 (8) ratios.

Online 5 July 2007

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