Tris[hexa-amminecobalt(III)] bis-[tri-oxalato-cobaltate(II)] chloride dodeca-hydrate.

ABSTRACT: The title compound, [Co(III)(NH?)?]?[Co(II)(C?O?)?]?Cl·12H?O, was synthesized under hydro-thermal conditions. The asymmetric unit comprises two [Co(NH?)?]³? cations, one located on a threefold axis and the other on a site of symmetry -3, a [Co(C?O?)?]?? 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 NH? mol-ecules, forming [Co(NH?)?]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(C?O?)?]?? 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.

SUBMITTER: Tian R 

PROVIDER: S-EPMC3393183 | biostudies-literature | 2012 Jul

REPOSITORIES: biostudies-literature