利用羧酸配体合理设计沸石型四氮唑框架及其快速吸附碘

沸石型金属有机框架因为其具有高孔隙率、可控的孔尺寸、规则的孔形状以及高的热稳定性和化学稳定性而被广泛研究,此类材料在碘的快速富集方面表现出潜在的应用前景。 本文通过模拟沸石的结构特点,分别利用2,5-噻吩二羧酸和4,4'-二苯醚二甲酸作为辅助配体合成两个四面体四氮唑框架(TTF-8和TTF-9)。 单晶X射线衍射测试表明TTF-8属于四方晶系,具有P4₂mc空间群,而TTF-9属于单斜晶系,具有P2₁/c空间群。 值得注意的是尽管TTF-8和TTF-9具有相同的BCT拓扑类型,但是其框架和孔道结构完全不同,而且两个四面体四氮唑框架均展示了优异、快速的碘吸附性能。

Rational Design of Zeolitic Tetrazolate Frameworks with Carboxylate Ligands for Rapid Accumulation of Iodine

Zeolitic metal-organic frameworks(MOFs) with high porosity, controlled pore size, regular pore shape, high thermal and chemical stability have been extensively studied and display potential applications in the field of rapid accumulation of iodine. Here, through simulating the structure of zeolite, two tetrahedral tetrazolate frameworks(TTF-8 and TTF-9) were successfully assembled via using thiophene-2,5-dicarboxylate and 4,4'-oxybisbenzoic acid as an auxiliary ligand, respectively. The results of single-crystal X-ray diffraction measurement show that TTF-8 crystallizes in a tetragonal space group of P4₂mc, while TTF-9 exhibits a monoclinic space group of P2₁/c. Remarkably, although TTF-8 and TTF-9 exhibit the same BCT topology, their frameworks and pore structures are entirely different. Two TTFs materials display outstanding performance on rapidly enriching iodine.