Tetra-ammonium μ-ethyl-enedi-amine-tetra-acetato-1κ3 O,N,O':2κ3 O'',N',O'''-bis-[trioxidotungstate(VI)] tetra-hydrate.

Lamine Yaffa,Daouda Ndoye,Waly Diallo,Cheikh Abdoul Khadir Diop,Mayoro Diop,Sérigne Fallou Pouye,Mamadou Sidibe

doi:10.1107/s2414314621009822

Abstract

The title compound, (NH4)4[W2(C10H12N2O8)O6]·4H2O, was obtained from a mixture of tungstic acid, ammonia and ethyl-enedi-amine-tetra-acetic acid (H4edta) in a 2:4:1 ratio. The anion of the complex contains two WO3 units and one bridging edta4- ligand. Each central metal atom is tridentately coordinated by nitro-gen and two carboxyl-ate groups of the edta4- ligand, together with the three oxido ligands, producing a distorted octa-hedral coordination environment around each tungsten atom. The center of the carbon-carbon bond of the ethyl-ene bridge represents a crystallographic inversion center. The crystal structure consists of a three-dimensional supra-molecular framework built up by the dinuclear cations, the ammonium counter-ions and the solvent water mol-ecules via hydrogen bonds of the N-H⋯O and O-H⋯O type.

Highlights

The title compound, (NH4)4[W2(C10H12N2O8)O6]Á4H2O, was obtained from a mixture of tungstic acid, ammonia and ethylenediaminetetraacetic acid (H4edta) in a 2:4:1 ratio
Each central metal atom is tridentately coordinated by nitrogen and two carboxylate groups of the edta4À ligand, together with the three oxido ligands, producing a distorted octahedral coordination environment around each tungsten atom
The edta4À ligand itself acts as a bridge between the two WO3 units, with the central carbon–carbon bond representing a crystallographic center of inversion

Summary

Structure description

Research on inorganic–organic framework materials is one of the fastest growing areas in materials chemistry because of their unique hybrid nature, which enables the combination of properties from both inorganic and organic materials (Cheetham & Rao, 2007). Polycarboxylates are multidentate chelating agents that are widespread in nature and industry because of their ability to coordinate with various transition metals in different ratios (Nicolau & Guy, 1995; Langer, 2000). As a part of this field, molybdenum polycarboxylate complexes have been thoroughly investigated over the past three decades (Lee & Holm, 2004).

DÁ Á ÁA

Synthesis and crystallization

Data collection Diffractometer Absorption correction

Data collection

Special details