A two-dimensional microporous metal–organic framework for highly selective adsorption of carbon dioxide and acetylene

Solvothermal reaction of 3-aminoisonicotinic acid (Haina) and Cu(NO 3 ) 2 ·2.5H 2 O gave a novel two-dimensional (2D) microporous metal–organic framework, [Cu(aina) 2 (DMF)]·DMF ( 1 , DMF = N,N-dimethylformamide). Single-crystal X-ray crystallographic study of compound 1 revealed that Cu(II) ions are linked by aina − ligands forming square grid-like layers, which stack together via multiple hydrogen bonding interactions. The solvent-free framework of 1a displayed considerable porosity (void = 46.5%) with one-dimensional (1D) open channels (4.7 A × 4.8 A) functionalized by amino groups. Gas sorption measurements of 1 revealed selective carbon dioxide (CO 2 ) and acetylene (C 2 H 2 ) adsorption over methane (CH 4 ) and nitrogen (N 2 ) at ambient temperature.