title: Bis(1-ammonio-ethane-1,1-diyl-diphos-phonato-κO,O')diaqua-cobalt(II) nona-hydrate.
abstract: In the title compound, [Co(C(2)H(8)NO(6)P(2))(2)(H(2)O)(2)]·9H(2)O, the Co(II) atom has a slightly distorted octa-hedral coordination environment consisting of four deprotonated phospho-nate O atoms of two independent 1-amino-ethyl-idendiphospho-nate anions and complemented by the O atoms of two water mol-ecules in cis positions. The anions exists in the zwitterionic form (protonated amino group and two deprotonated phospho-nate O atoms) and constitute two six-membered chelate rings. The crystal structure also contains nine partly disordered uncoordinated water mol-ecules, which create an extensive three-dimensional network of strong O-H⋯O and N-H⋯O hydrogen bonds.
authors.affiliation: Institute of General and Inorganic Chemistry, NAS Ukraine, Kyiv, prosp. Palladina 32/34, 03680, Ukraine.
authors.forename: Vladimir V
authors.initials: VV
authors.lastname: Bon
authors.forename: Anatolij V
authors.initials: AV
authors.lastname: Dudko
authors.forename: Alexandra N
authors.initials: AN
authors.lastname: Kozachkova
authors.forename: Vasily I
authors.initials: VI
authors.lastname: Pekhnyo
authors.forename: Natalia V
authors.initials: NV
authors.lastname: Tsaryk