Synthesis of a 3-D porous Tb-MOF: organic dye adsorption

A 3-D lanthanide metal–organic framework, [Tb2(L)1.5(DMF)2]·2DMF (1) (L = 14-diylbis(acylamino-21-diyl))-diisophthalic acid), has been synthesized under solvothermal conditions. 1 was characterized by X-ray single-crystal analysis and powder X-ray diffraction. The 3-D framework of 1 is constructed by 2-D channels embedded in a plane. Network analysis reveals that 1 is a (4,5,6,6)-connected net with stoichiometry (4-c)2(5-c)2(6-c)3. As expected, this terbium(III) metal–organic framework exhibits good properties for adsorbing organic dye molecules due to its NH- group. It shows good adsorption selectivity for rhodamine B (RB) rather than methyl orange (MO) and methylene blue (MB) molecules.