Research Article: Bis[(1-ammonio­ethane-1,1-di­yl)diphospho­nato-κ2O,O′]diaqua­nickel(II) nona­hydrate

Date Published: May 01, 2010

Publisher: International Union of Crystallography

Author(s): Vladimir V. Bon, Anatolij V. Dudko, Alexandra N. Kozachkova, Vasily I. Pekhnyo, Natalia V. Tsaryk.


The title compound, [Ni(C2H8NO6P2)2(H2O)2]·9H2O, exhibits a slightly distorted octa­hedral coordination environment around the NiII atom. It contains two mol­ecules of 1-amino­­ethyl­idenediphospho­nic acid in the zwitterionic form, coord­inated via O atoms from two phospho­nate groups and creating two six-membered chelate rings. Two water mol­ecules in cis positions complete the coordination environment of the NiII atom. The title compound contains nine partly disordered solvent water mol­ecules, which create a three-dimensional network of strong O—H⋯O and N—H⋯O hydrogen bonds.

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For general background to the use of organic diphospho­nic acids, see: Matczak-Jon & Videnova-Adrabinska (2005 ▶). For applications of transition-metal bis­phospho­nates, see: Eberhardt et al. (2005 ▶). For related structures, see: Li et al. (2007 ▶); Dudko et al. (2009 ▶).




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