Crystal structure of di­aqua­(μ2-tri­ethyl­ene­tetra­minehexa­acetato)­dizinc tetra­hydrate

摘要

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 ZnII ions are octahedrally surrounded and bound by an N2O3 donor set from the H2TTHA4− anion and a water mol­ecule; the N atoms are cis and the water mol­ecule is trans to 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.