Advanced materials: crystalline organic porous salts, from micropores to graded pores

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porous materials have been widely used in adsorption separation energy conversion catalysis due to their unique pore structure which can control the interaction between guest molecules host materials at the molecular level. Different from traditional porous materials crystalline organic porous salt materials are composed of organic acids bases through ionic bonds with permanent microporous structure polar pore structure. This gives crystalline organic porous salts a wide range of applications in proton conduction polar molecular transport. Among them the construction of permanent pores in crystalline organic salt materials is still a great challenge. Moreover the reported crystalline organic porous salts only have a single microporous structure which greatly limits the transport of guest molecules especially the transport diffusion of organic macromolecules.

Professor Su Baolian researcher Chen Lihua of Wuhan University of technology Professor Ben Teng of Jilin University introduced elaborated its definition classification synthesis method skeleton mechanism pore properties wide application in detail proposed that the introduction of hierarchical pore structure in cposs materials would effectively solve the problem of circulation in cposs materials The diffusion performance is insufficient. Hierarchical pore structure combined with different scale channel structure can effectively improve the material transport performance thus improving the target performance of materials. In addition the potential of hierarchical pore structure construction in traditional microporous crystalline organic porous salts is prospected possible strategies for hierarchical pore construction are provided. The specific methods challenges are evaluated elaborated.

crystalline organic porous salt materials are composed of organic acids bases through charge assisted hydrogen bonding. The special bonding type endows the crystalline organic porous salt with strong stability which can be used in negative linear compression other applications. The unique structure endows crystalline organic porous salts with ordered microporous structure polarized pore properties which are widely used in proton conduction guest molecule transport. The authors of

reviewed in detail the synthesis strategies of crystalline organic porous salts (synthesis methods based on organic acids containing sulfonic acid or carboxylic acid groups) structural properties (permanent porosity crystal structure structural characteristics CO2 adsorption characteristics polarization channels) application fields (proton conduction CO2 diffusion negative linear compressibility molecular motor). The synthesis strategies (based on coordination Flexible clusters based on supramolecular cages based on synthesis conditions) structural properties (based on multi pore structure) application fields (fluorescence modulation electron transport molecular exchange material packaging) of some crystalline organic salts with multiple channels are also discussed to further guide the synthesis Application of new organic porous salts. Although

have abundant microporous structure polarized channels their inherent microporous structure is not conducive to the transport diffusion of substances especially when the guest molecules are organic macromolecules. For the first time it is proposed that the hierarchical pore system in crystalline organic porous salt is a solution to the current challenge. Hierarchical pore structure is widely used in traditional microporous materials (molecular sieves MOFs). It has been proved that hierarchical pore structure can significantly improve the transport diffusion properties of materials enhance the target performance of materials. Based on the mature feasible methods to construct hierarchical pore structure in molecular sieves MOFs the author proposed a variety of possible methods mainly in-situ template method bottom-up layer by layer assembly method. The author points out the potential challenges of these methods. This paper plays an important role in the synthesis structure application development of new crystalline organic porous salt materials.

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