title: Diammonium diaqua-bis(methyl-enediphospho-nato-κO,O')cobaltate(II).
abstract: In the salt, (NH(4))(2)[Co(CH(4)O(6)P(2))(2)(H(2)O)(2)], the methyl-ene-diphospho-nate acts as a bidentate ligand and the Co(II) ion (site symmetry ) assumes an octa-hedral CoO(6) coordination geometry. The acid H atom of the ligand is distributed over two O atoms. In the crystal, a three-dimensional network is formed through O-H⋯O and N-H⋯O hydrogen bonds between the cations and anions.
authors.affiliation: Department of Chemistry, University of the Free State, PO Box 339, Bloemfontein, 9330, South Africa.
authors.forename: K A
authors.initials: KA
authors.lastname: Van der Merwe
authors.forename: Hendrik G
authors.initials: HG
authors.lastname: Visser
authors.forename: J A
authors.initials: JA
authors.lastname: Venter