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首页> 外文期刊>RSC Advances >Facile synthesis of MOFs with uncoordinated carboxyl groups for selective CO2 capture via postsynthetic covalent modification
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Facile synthesis of MOFs with uncoordinated carboxyl groups for selective CO2 capture via postsynthetic covalent modification

机译：通过合成后共价修饰轻松合成具有未配位羧基的MOF以选择性捕获CO 2

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A postsynthetic covalent strategy involving dual-acyl chloride has been developed to introduce uncoordinated carboxyl groups into amine containing metal–organic frameworks (MOFs). The carboxyl group functionalized MOFs have been 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 uncoordinated carboxyl groups were successfully grafted to the MIL-101(Cr)–NH2 framework. In addition, most of the amine groups (>80%) were grafted with carboxyl groups, which indicates this method is very effective. The thermal stability and adsorption selectivity of CO2/N2 were substantially enhanced, albeit the BET surface areas and total pore volumes were reduced. These observations could be explained by the effect of elimination of macropores in the framework due to the projecting of new functional groups in pore apertures. Here the successful fabrication of a MOF with uncoordinated carboxyl groups provides the possibility of efficiently modifying other MOFs.
机译：已开发出一种涉及双酰氯的合成后共价策略，以将未配位的羧基引入含胺的金属有机骨架（MOF）。羧基官能化的MOF已通过多种技术进行了表征，包括X射线衍射图样，扫描电子显微镜，傅里叶变换红外光谱，核磁共振，热重分析和气体吸附。结果清楚地表明，未配位的羧基已成功接枝到MIL-101（Cr）–NH 2 骨架上。此外，大多数胺基（> 80％）都接有羧基，这表明该方法非常有效。尽管BET表面积和CO 2 / N 2 的热稳定性和吸附选择性得到了显着提高。总孔体积减少。这些观察结果可以解释为由于孔隙中新官能团的投射而消除了骨架中大孔的影响。在这里，具有未配位羧基的MOF的成功制备提供了有效修饰其他MOF的可能性。

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