Development of a Porous Coordination Polymer with a High Gas Capacity Using a Thiophene-Based Bent Tetracarboxylate Ligand

A new porous coordination polymer (PCP) based on a ligand with a unique bent angle bearing a thiophene-bridged bent carboxylate ligand and the Cu<sup>2+</sup> ion was synthesized and structurally characterized. The structure has a pillared-layer framework based on a kagomé-like layer with aromatic partition groups. It exhibits a high CO<sub>2</sub> uptake of 180 mL­(STP)/g at 1 bar, and 400 mL­(STP)/g at 30 bar at 273 K. The uptakes of C<sub>2</sub>H<sub>2</sub> and C<sub>2</sub>H<sub>4</sub> reach 164 and 160 mL­(STP)/g at 298 K and 1 bar, with good selectivity of C<sub>2</sub>H<sub>2</sub> and C<sub>2</sub>H<sub>4</sub> over CH<sub>4</sub>, both of which are among the highest levels of reported PCPs.