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The title compound, [Co(III)(NH₃)₆]₃[Co(II)(C₂O₄)₃]₂Cl·12H₂O, was synthesized under hydro-thermal conditions. The asymmetric unit comprises two [Co(NH₃)₆]³⁺ cations, one located on a threefold axis and the other on a site of symmetry -3, a [Co(C₂O₄)₃]⁴⁺ anion, located on a threefold axis, one sixth of a chloride anion [disordered over two sites, one threefold (site occupancy = 0.5) and the other -3 (site occupancy (0.25)] and two water molecules. Both Co(III) centers are six-coordinated by NH₃ mol-ecules, forming [Co(NH₃)₆]³⁺ octa-hedra, with Co-N distances in the range 1.958 (2)-1.977 (3) Å. The title structure gives the first example of the [Co(C₂O₄)₃]⁴⁻ anion, with the distorted octa-hedral environment of Co(II) center formed by six O atoms from three oxalate residues. The Co-O bond lengths are 2.0817 (18) to 2.0979 (18) Å. Multiple N-H⋯O, N-H⋯Cl and O-H⋯O hydrogen bonds link the cations, anions and water mol-ecules into a three-dimensional network.

Tris[hexaamminecobalt(III)] bis[trioxalatocobaltate(II)] chloride dodecahydrate