Facile synthesis of MOFs with uncoordinated carboxyl groups for selective CO2 capture via postsynthetic covalent modification

摘要: A postsynthetic covalent strategy involving dual-acyl chloride has been developed to introduce uncoordinated carboxyl groups into amine containing metal–organic frameworks (MOFs). The group functionalized MOFs have characterized by various techniques, including X-ray diffraction patterning, scanning electron microscopy, Fourier transform infrared spectroscopy, nuclear magnetic resonance, thermal gravimetric analysis, and gas adsorption. Results clearly indicated were successfully grafted the MIL-101(Cr)–NH2 framework. In addition, most of (>80%) with groups, which indicates this method is very effective. stability adsorption selectivity CO2/N2 substantially enhanced, albeit BET surface areas total pore volumes reduced. These observations could be explained effect elimination macropores in framework due projecting new functional apertures. Here successful fabrication a MOF provides possibility efficiently modifying other MOFs.