Acta Cryst. (2003). E59, m812-m813  [ doi:10.1107/S160053680301883X ]

Dipotassium di--hydroxo-bis[(nitrilotriacetato-⁴N,O,O',O'')chromium(III)] hexahydrate

J.-H. Choi, T. Suzuki and S. Kaizaki

Abstract: The crystal structure of the title compound, K₂[Cr₂(C₆H₆NO₆)₂(OH)₂]·6H₂O or K₂[Cr₂(-OH)₂(nta)₂]·6H₂O (nta = nitrilotriacetate), is composed of a dinuclear hydroxo-bridged chromium(III) complex anion, potassium cation and water molecules. Each Cr^III ion is in a distorted octahedral environment and coordinated by one nitrogen and three carboxylate O atoms of the nta^3- ligand plus two bridging hydroxo O atoms. The dinuclear complex anion possesses 2/m crystallographic symmetry. The Cr-O(-OH) bond lengths are 1.937  (4) and 1.951  (4)  Å. The Cr-N and Cr-O bond distances of the nta^3- ligand are 2.054  (4) and 1.968  (3)-1.983  (3)  Å, while the HO-Cr-OH and Cr-OH-Cr angles are 80.46  (16) and 99.54  (16)°, respectively.

Online 30 August 2003

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