High yield Cycloaddition of Carbon Dioxide to Epoxides Catalysed by Metal Organic Frameworks
A series of Metal-Organic Frameworks (MOFs) based on trimesic acid (btc) have been synthesized using a solvothermal procedure which exhibits excellent catalytic fixation of CO2. Cycloaddition of CO2 to epoxide to produce cyclic carbonates is quite promising. The chemical fixation of CO2 reported here is solvent free and carried out under moderately mild conditions. All the MOFs [Zn-btc (1), Co-btc (2), Ni-btc (3), Cu- btc (4)] were synthesized under same experimental conditions yet possess different structural and catalytic properties. All the catalysts follow first-order kinetics, and Zn-btc (1) proved to be the most catalytically active catalyst among all with ~100% yield with a total turnover number of 18,845 per mole of catalyst and an initial TOF (hour-1) of 946 with respect to Cyclic carbonate. All MOFs (1 – 4) show almost 100% conversion in these reactions. Same reaction using other metal (Co, Ni, Cu)-btc compounds have also yielded product more than 94 % creating an extra impact on the importance of the work.