Structural studies of poly[(μ2-acetato)(μ3-5-aminoisophthalato)diaquacerium(III) monohydrate]: A new three dimensional fluorescent metal-organic framework constructed from dimers of CeO9 polyhedra with hydrophilic ‘S’ shaped channels

Abstract

A new Ce(III) complex of 5-aminoisophthalic acid (H2aip), [Ce(CH3COO)(aip)(H2O)2]·H2O, has been prepared by single gel diffusion technique at room temperature using sodium metasilicate. The gel-grown crystals were characterised by CHN analysis, thermogravimetry, FT-IR and UV- Visible spectral studies. The single crystal X- ray diffraction studies reveal that the title compound crystallizes in monoclinic space group P21/c. CeO9 polyhedra have distorted tricapped trigonal prism geometry and form edge sharing dimers. The adjacent dimers are connected by aip2− in different directions and generate a three dimensional network structure with hydrophilic channels. The luminescent behaviour of the complex and the ligand were also investigated and the complex shows blue shifted emission.