Syntheses, structures and photoluminescence of two microporous lanthanide coordination polymers

Two isostructural lanthanide complexes, [Ln2(INO)4(NO3)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.