1] Department of Chemistry and Biochemistry, California State University, Long Beach, 1250 Bellflower Boulevard, Long Beach, California 90840, USA [2] Department of Chemistry, University of California, Riverside, California 92521, USA.
Nat Commun. 2013;4:2344. doi: 10.1038/ncomms3344.
Crystalline porous materials, especially inorganic porous solids such as zeolites, usually have negative frameworks with extra-framework mobile cations and are widely used for cation exchange. It is highly desirable to develop new materials with positive frameworks for selective anion exchange and separation or storage and delivery. Recent advances in metal-organic framework synthesis have created new opportunities in this direction. Here we report the synthesis of a series of positive indium metal-organic frameworks and their utilization as a platform for the anion exchange-based separation process. This process is capable of size- or charge-selective ion-exchange of organic dyes and may form the basis for size-selective ion chromatography. Ion-exchange dynamics of a series of organic dyes and their selective encapsulation and release are also studied, highlighting the advantages of metal-organic framework compositions for designing host materials tailored for applications in anion separation and purification.
结晶多孔材料，尤其是沸石等无机多孔固体，通常具有带额外框架可动阳离子的负骨架，因此被广泛应用于阳离子交换。而开发具有正骨架的新型材料以用于选择性阴离子交换、分离或储存与输送，则是人们所期望的。近年来，金属有机骨架的合成技术取得了新的进展，为这一方向提供了新的契机。在此，我们报道了一系列正铟金属有机骨架的合成及其在基于阴离子交换的分离过程中的应用。该过程可实现有机染料的尺寸或电荷选择性离子交换，可能成为尺寸选择性离子色谱的基础。我们还研究了一系列有机染料的离子交换动力学及其选择性包封和释放，突出了金属有机骨架组成在设计用于阴离子分离和净化的主体材料方面的优势。
