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首页> 外文期刊>Chemistry: A European journal >A guest-dependent approach to retain permanent pores in flexible metal- Organic frameworks by cation exchange
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A guest-dependent approach to retain permanent pores in flexible metal- Organic frameworks by cation exchange

机译：依赖于客人的方法，通过阳离子交换在柔性金属有机框架中保留永久孔

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摘要

Two anionic metal-organic frameworks were successfully prepared based on pre-designed flexible multicarboxylate ligands and indium cations. Owing to the flexibility of the bridging organic linkers, which could not themselves sustain the frameworks, both of the frameworks showed thermal instability and shrinkage after removal of guest solvent molecules. Inspired by bamboo, we used a guest-dependent approach to tune the permanent porosity of the MOFs. In this approach, several tetraalkyammonium cations of different sizes were introduced into the channels by cation exchange to act as partitions and to support the main frameworks. This approach significantly enhanced the stability of the framework and its permanent porosity. Moreover, the gas-adsorption properties (such as gate sorption, hysteresis, and selectivity) of the MOFs were also modulated by the judicious choice of guest cations.
机译：基于预先设计的柔性多羧酸盐配体和铟阳离子，成功制备了两个阴离子金属有机骨架。由于桥接有机接头的柔性，其本身不能维持框架，两个框架在除去客体溶剂分子后均显示出热不稳定性和收缩。受到竹子的启发，我们使用了依赖于客人的方法来调整MOF的永久孔隙率。在这种方法中，通过阳离子交换将几种不同尺寸的四烷基铵阳离子引入通道中，以充当隔板并支撑主要骨架。这种方法大大提高了框架的稳定性及其永久性的孔隙率。而且，MOF的气体吸附特性（例如门吸附，滞后和选择性）也受到客体阳离子的明智选择的调节。

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