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 Cu²⁺ 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 CO₂ uptake of 180 mL­(STP)/g at 1 bar, and 400 mL­(STP)/g at 30 bar at 273 K. The uptakes of C₂H₂ and C₂H₄ reach 164 and 160 mL­(STP)/g at 298 K and 1 bar, with good selectivity of C₂H₂ and C₂H₄ over CH₄, both of which are among the highest levels of reported PCPs.