Crystal structure of diaqua(μ2-triethylenetetraminehexaacetato)dizinc tetrahydrate

Abstract

The reaction of ZnO and triethylenetetraminehexaacetic acid (H6TTHA) in aqueous solution after refluxing yields the binuclear title compound, [Zn2(C18H26N4O12)(H2O)2]·4H2O. There is a centre of symmetry in the [Zn2(H2TTHA)(H2O)2] molecule in the crystalline state. Both ZnIIions are octahedrally surrounded and bound by an N2O3donor set from the H2TTHA4−anion and a water molecule; the N atoms arecisand the water molecule istransto an N atom. The Zn...Zn separation is 7.562 (1) Å. An intramolecular C—H...O interaction is observed and both carboxylate H atoms are disordered over two adjacent sites. In the crystal, the components are linked by O—H...O and C—H...O hydrogen bonds generating a three-dimensonal network.