A new multi-functional Cu(ii)-organic framework as a platform for selective carbon dioxide chemical fixation and separation of organic dyes

Abstract

A new multi-functional metal–organic framework, {[Cu₂(HL)(H₂O)₂]·NMP·2H₂O}_n (1), was assembled by employing an asymmetrical V-shaped rigid multicarboxylic acid ligand H₅L (H₅L = 2,4-di(2′,5′-dicarboxylphenyl)benzoic acid) with Cu(II) ions. 1 possesses a 3D pore formed by two types of intersecting 1D cuboid channels. Moreover, owing to the abundant uncoordinated carboxylate O atoms decorated in the channels and open metal centers generated by the removal of coordinated water molecules, 1 exhibits a high CO₂ adsorption capacity and significantly selective capture for CO₂ over CH₄. Hence, further research on the chemical fixation of CO₂ is implemented, which reveals excellent heterogeneous catalytic activity. In addition, 1 displays particularly selective sorption towards the rhodamine B (RB) dye. Consequently, this study may provide a facile synthetic route for the construction of multi-functional materials.