The Investigation of CO₂ Chemical Fixation and Fluorescent Recognition for Yb^III-Organic Framework

A dual-channel material of {[(CH3)(2)NH2][Yb-3(BDCP)(2)(H2O)(3)]center dot 2DMF center dot 3H(2)O}(n) (NUC-58) has been generated from the combination of wave-like [Yb-2(CO2)(6)(H2O)(2)](n) chains and [Yb(CO2)(4)(H2O)] units with the aid of 2,6-bis(2,4-dicarboxylphenyl)-4-(4- carboxylphenyl)pyridine, which has excellent physical and chemical properties including a larger specific surface area, high porosity, water resistance and thermal stability. NUC-58 is a rarely reported microporous MOFs with solvent-free dual channels. Thanks to its coexistence of Lewis acid-base sites including rich hexa/hepta-coordinated Yb3+ ions, C = O groups from mu(1)-eta(1):eta(1) CO2-, and N-pyridine atoms, NUC-58 displays highly catalytic activity on the cycloaddition reaction of epoxides and CO2 into related cyclic carbonates under mild solvent- free reaction conditions. In addition, NUC-58 could be used as a fast, sensitive and highly efficiency sensor for Cu2+ detection in aqueous solution. Therefore, the work shows that microporous MOFs assembled from pyridine-containing polycarboxylic acid ligands and rare earth ions can serve as excellent catalytic and luminescent materials. [GRAPHICS] .