Diammonium aqua(ethylenediaminetetraacetato)iron(II) trihydrate

Abstract

In the title compound, (NH4)2[Fe(C10H12N2O8)(H2O)]·3H2O, the FeII center is in a distorted pentagonal-bipyramidal geometry. Two carboxylate O and two N atoms from the ethylenediaminetetraacetate (EDTA) ion and one O atom from coordinated water comprise the equatorial plane. Two other carboxylate O atoms from the EDTA ion occupy the apical sites. Both ammonium cations and all water molecules function as hydrogen-bond donors, and ten N—H...O and nine O—H...O hydrogen bonds form a three-dimensional network between the complex anions, cations and the water molecules.