A 3,5-Connected 3D Nickel-Mixed Ligands Coordination Polymer with Selective Adsorption of Carbon Dioxide

The gas adsorption is an important research field of coordination chemistry and bioinorganic chemistry, in which the selective absorption of CO2 in the presence of N2 is a challenge in these fields. A coordination polymer [Ni2(tib)2(1,4-NDC)2]·7H2O (NTN) was synthetized by the reaction of the mixed ligands: 1,4-naphthalenedicarboxylic acid (1,4-H2NDC) and 1,3,5-tris(1-imidazolyl) benzene (Tib) with Ni2+ under solvothermal conditions. X-ray single-crystal analysis (CIF file CCDC no. 2053530) results indicate that NTN possesses a supramolecular isomers with two-fold interpenetrating 3D frameworks with {42·65·83}{42·6} topology. NTN is further characterized by powder IR spectroscopy, elemental analysis, X-ray diffraction, and thermogravimetric analysis. Notably, NTN possess an excellent selective CO2 sorption property compared with N2.