A Charged Coordination Cage-Based Porous Salt

Metal–organic frameworks and porous coordination cages have
shown incredible promise as a result of their high tunability. However,
syntheses pursuing precisely targeted mixed functionalities, such
as multiple ligand types or mixed-metal compositions are often serendipitous,
require postsynthetic modification strategies, or are based on complex
ligand design. Herein, we present a new method for the controlled
synthesis of mixed functionality metal–organic materials via
the preparation of porous salts. More specifically, the combination
of porous ionic molecules of opposite charge affords framework-like
materials where the ratio between cationic cage and anionic cage is
potentially tunable. The resulting doubly porous salt displays the
spectroscopic signatures of the parent cages with increased gas uptake
capacities as compared to starting materials. This approach will be
widely applicable to all families of porous ions and represents a
new and powerful method for the synthesis of porous solids with tailored
functionalities.

金属有机框架与多孔配位笼因其卓越的可调性而展现出巨大的潜力。然而，针对精确目标混合功能的合成，如多种配体类型或混合金属组成，往往具有偶然性，需要后合成修饰策略，或基于复杂的配体设计。本研究所提出的新方法，通过制备多孔盐来控制合成具有混合功能的金属有机材料。具体而言，通过将相反电荷的多孔离子分子相结合，可形成框架状材料，其中阳离子笼与阴离子笼的比率具有潜在的调节性。所得到的双孔盐展现出与母体笼相同的光谱特征，相较于起始材料，其气体吸附容量有所增加。该方法将广泛应用于所有多孔离子家族，并代表了一种合成具有定制功能多孔固体的新颖且强大的方法。