Syntheses, structures and photoluminescence of two microporous lanthanide coordination polymers

Abstract

Two isostructural lanthanide complexes, [Ln 2 (INO) 4 (NO 3 ) 2 ] n ·2nDMF [Ln = Eu ( 1 ), Tb ( 2 )] (INO = isonicotinate- N -oxide; DMF = N , N -dimethylformamide), have been synthesized under the solvothermal condition and characterized by single-crystal X-ray diffraction, X-ray powder diffraction (XRD), thermogravimetric analysis (TGA) and elemental analysis (EA). In these two complexes, each dinuclear Ln(III) unit is connected with six neighboring dinuclear units, which finally constructs a three-dimensional (3D) framework. Along the crystallographic [0 0 1] direction, there are one-dimensional (1D) tunnels, in which free DMF molecules reside as guests. Additionally, the photoluminescent properties of 1 and 2 are also discussed. Two isostructural lanthanide(III) complexes both exhibit 3D microporous pcu structures containing di-nuclear lanthanide(III) units, in which free DMF molecules reside as guests. To further investigate the properties of the above complexes, the photoluminescent properties of 1 and 2 are also discussed. ► Two microporous lanthanide(III) complexes both exhibit 3D pcu structures. ► Free DMF molecules reside in 1D tunnels as guests. ► The title complexes emit intensely in the visible region.