The photoluminescence and gas sorption properties of three Cd(II) MOFs based on 1,3,5-benzenetribenzoate with -NH2 or -OH groups

The functionalization and modification of the ligand 1,3,5-tris(4-carboxyphenyl) benzene (H3BTB) have been realized with amine (NH2-H3BTB) and hydroxy (HO-H3BTB) groups. Three new Cd(II) compounds based on R-H3BTB ligands (R = -NH2 and -OH) have been synthesized and structurally characterized. Compounds 1 and 2 show pillared-layer frameworks and display strong fluorescence emission ability. Compound 3 features a 3D porous framework with trinuclear Cd units linked by the NH2-BTB ligand. The activated framework of 3 has good gas storage and separation properties for CO2 and hydrocarbons.