Acta Cryst. (2004). E60, i66-i68  [ doi:10.1107/S1600536804007895 ]

Dipotassium cobalt(II) bis(hydrogenphosphite) dihydrate, K₂Co(HPO₃)₂·2H₂O

R. Ouarsal, R. Essehli, M. Lachkar, M. Zenkouar, M. Dusek, K. Fejfarova and B. El Bali

Abstract: K₂Co(HPO₃)₂·2H₂O is a new phosphite within the K-T-H₃PO₃ system (T = divalent transition metal cation). Its structure can be described as a three-dimensional network made up of KO₆ and HPO₃ polyhedra, which share corners and edges. In the cavities of this framework, Co²⁺ ions are located in an almost regular octahedral oxygen coordination. An IR study has confirmed the presence of HPO₃ hydrogenphosphite groups.

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