Two Robust In(III)-Based Metal-Organic Frameworks with Higher Gas Separation, Efficient Carbon Dioxide Conversion,...

With the aid of a pyridyl tetracarboxylate ligand, 2,5-bis(2',5'-dicarboxylphenyl)pyridine (H₄L), two indium-organic frameworks, [In₂(L)(OH)₂]·2DMF·2H₂O (1) and [Me₂NH₂][In(L)]·2.5NMF·4H₂O (2), with (6,8)- and (4,4)-connected nets have been constructed in different solvent systems. Both 1 and 2 exhibit high thermal and chemical stability. Gas sorption behavior of 1 and 2 for N₂, C₂H₂, C₂H₄, CO₂, and CH₄ indicate excellent separation selectivities of C₂H/CH₄ and CO₂/CH₄. Furthermore, 1 possesses a high density of Brønsted sites and shows efficient catalytic conversion for CO₂ cycloaddition with epoxides. Meanwhile, luminescence investigations reveal that 2 can detect nitrofurazone efficiently.