Acta Cryst. (2007). E63, m2998-m2999  [ doi:10.1107/S1600536807056437 ]

Racemic dipotassium di-₂-hydroxido-bis{[N,N-bis(carboxylatomethyl)leucinato-⁴N,O,O',O'']cobaltate(III)} tetrahydrate

H. G. Visser, W. Purcell, A. Muller, J. M. Janse van Rensburg and P. Molosia

Abstract: The racemic title compound, K₂[Co₂(C₁₀H₁₃NO₆)₂(OH)₂]·4H₂O, exhibits a slightly distorted octahedral coordination of the Co atoms, possibly because of constraints imposed by the tetradentate ligand. The ten-coordinate potassium cation provides a link between the ligating anions of the dinuclear dianion via the carbonyl O atoms of the N,N-bis(carboxylatomethyl)leucinate ligands, forming a polymeric three-dimensional network. The complex crystallizes in the orthorombic space group, Cmca, resulting in Co dimers situated around special positions in the unit cell, which leads to a 50% disorder of the bridging hydroxido H atoms and the isopropyl substituents.

Online 14 November 2007

Copyright © International Union of Crystallography
IUCr Webmaster