Synthesis, structural determination and spectroscopic analysis of a novel 2D terbium coordination network with ethyleneglycol-bis-(2-aminoethylether)-N,N,N′,N′-tetraacetic acid

A novel two-dimensional (2D) mononuclear complex, namely, (enH2)[TbIII(egta)(H2O)]2·6H2O (H4egta = ethyleneglycol-bis-(2-aminoethylether)-N,N,N′,N′-tetraacetic acid and en = ethylenediamine), was successfully synthesized and characterized by infrared spectrum, UV–vis spectrum, fluorescence spectrum, thermal analysis and single-crystal X-ray diffraction techniques. Single-crystal X-ray diffraction analysis reveals that the central Tb(III) ion is nine-coordinate in geometry of pseudo-monocapped square antiprismatic polyhedron. Furthermore, the hydrogen bonds play an important role in the fabrication of layer structure of the complex. Through hydrogen bonds between ethylenediamine cation (enH22+) and [TbIII(egta)(H2O)]– complex anion, the title complex forms a 2D layer network along [1 1 1] crystallographic direction. Particularly, the fluorescent property is also fully investigated, which indicates that the title complex would be a potential candidate as fluorescent materials.

Graphical abstractA novel two-dimensional (2D) mononuclear coordination polymer, (enH2)[TbIII(egta)(H2O)]2·6H2O, was successfully synthesized. Single-crystal X-ray diffraction analysis reveals that the central Tb(III) ion is nine-coordinate in geometry of pseudo-monocapped square antiprismatic polyhedron. Through hydrogen bonds between ethylenediamine cation (enH22+) and [TbIII(egta)(H2O)]-complex anion, the title complex forms a 2D layer structure along [1 1 1] crystallographic direction. Particularly, the fluorescent property is also fully investigated.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► (enH2)[TbIII(egta)(H2O)]2·6H2O with novel 2D layer structure was synthesized. ► UV–vis and fluorescence spectra of (enH2)[TbIII(egta)(H2O)]2·6H2O are analyzed. ► Interaction of enH22+ and [TbIII(egta)(H2O)]– in (enH2)[TbIII(egta)(H2O)]2·6H2O was studied.