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

Date Published: July 01, 2012

Publisher: International Union of Crystallography

Author(s): Ruijng Tian, Yan Yan, Cailing Zhang, Liyan Wang, Qinhe Pan.


The title compound, [CoIII(NH3)6]3[CoII(C2O4)3]2Cl·12H2O, was synthesized under hydro­thermal 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 CoIII centers are six-coordinated by NH3 mol­ecules, forming [Co(NH3)6]3+ octa­hedra, 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 octa­hedral environment of CoII 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 mol­ecules into a three-dimensional network.

Partial Text

For metal phosphates and germanates templated by metal complexes, see: Wang et al. (2003 ▶, 2006 ▶); Pan et al. (2005 ▶, 2008 ▶). For our continued research inter­est, see: Pan et al. (2010a ▶,b ▶, 2011 ▶). For a compound containing the [CoIII(NH3)6]3+ cation, see: Wu et al. (2012 ▶).




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