Cu2-cluster-based MOF with open metal sites and Lewis basic sites: Construction, CO2 adsorption and fixation

A new Cu2 cluster based MOF, namely, [Cu2(dcpn) (H2O) (OH)]∙0.5DMF∙0.5H2O (1) has been successfully constructed from Cu(II) ion and 5-(2′,5′-dicarboxylphenyl)nicotic acid. The 1 exhibits high porosity, and water stability in pH ​= ​0–13 aqueous solutions. Taking advantage of synergetic effect of the high density of Lewis acid Cu(II) and Lewis base –OH, the activated 1a possesses a certain CO2 uptake capacity. More importantly, 1a has an efficient catalytic activity and recyclability toward CO2 cycloaddition with epoxides under relatively mild conditions.