A Novel 2D Copper–Organic Framework for Catalyzing CO₂ Chemical Fixation and Luminescence Sensing

Abstract

Metal–organic frameworks (MOFs) show promising applications in catalysis and luminescent sensors due to their unique organic–inorganic porous structure. Herein, a novel copper MOF (Cu-MOF) is architected by the assembly of an imidazole and carboxylic acid functionalized flexible ligand (HIM) with copper ions under hydrothermal conditions. The Lewis acid and base built-in structure of HIM facilitate the architecting of a 2D porous 3-c network with {43} topology during the self-assembled coordination. the Cu-MOF can be used to catalyze the reaction of CO2 with epoxides to produce cyclic carbonates with 12 examples of substrate scope in 70–98% yields under mild conditions. The catalyst shows recycling ability and achieves the conversion of cyclic carbonate beyond 90% after 5 cycles. In addition, the Cu-MOF can be developed as a turn-on Fe3+-selective luminescent sensor with a detection limit of 0.53 μM. Moreover, the sensor can selectively recognize MnO4 – and Cr2O7 2– by emission quenching with detection limits of 0.57 and 0.23 μM, respectively. Besides, the sensor shows recycling ability in sensing and can be regenerated and reused 5 times. Therefore, the Cu-MOF exhibits versatility and offers promising applications in catalysis and luminescent sensors.

Metal Hydrogen-Bonded Organic Frameworks as Open Lewis Acid Catalysts for Two Types of CO2 Transformations

“…(b) Conversion–time curve of CO 2 cycloaddition with 1a . (c) Comparison of TON and TOF values among various catalysts (1, NU-1000-RX; 2, Zn­(dibpca)­(OAc); 3, Cu-MOF; 4, {2Cu­(L)­(A)·3H 2 O} n ; 5, [Th 48 Ni 6 ]-MOF; 6, [Zn 3.5 (PDC) 2 (H 2 O) 10 ]; 7, (Me 2 NH 2 ) 1.5 [In 1.5 L 2 ]·2DMF·2H 2 O; 8, HKUST-1; 9, PCN-224­(Co)-BPDC-CH 2 NBu 3 Br; 10, NUC-82a; 11, Zn-MOF-184; 12, SalRu). (d) Catalytic performance of catalyst 1 being used six consecutive times.…”