A Robust,Water-stable,and Multifunctional Praseodymium-organic Framework Showing Permanent Porosity,CO2 Adsorption Properties,and Selective Sensing of Fe^3+Ion

A robust microporous praseodymium-organic framework,{[Pr3(NTB)3(H2O)3]·(DMF)3(H2O)4}n(Pr-NTB,1),was solvothermally synthesized based on 4,4′,4″-nitrilotribenzoic acid(H3 NTB)and fully characterized.Single-crystal X-ray diffraction analysis reveals compound 1 possesses a three-dimensional porous coordination network,in which discrete cages are connected through microporous windows.1 shows extraordinary thermal and water stability;in particular,it is stable in aqueous media from pH=3 to 11,which is outstanding in benzyl-carboxylate based MOFs.Furthermore,1 exhibits permanent porosity with the BET surface area of 156.2 m^2·g^-1 and can adsorb suitable CO2(1.14 mmol·g^-1 at 273K/1 bar)with isosteric heat of adsorption(Q(st))of 28.5 kJ·mol^-1.These features suggest that the porous material 1 is a good candidate for CO2 capture in real-world application.Notably,the integration of fluorescent property,porosity and water stability in 1 promises it as a selective fluorescent sensor for Fe^3+cation in water.