Selective anion exchange with nanogated isoreticular positive metal-organic frameworks

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 s...

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Bibliographic Details
Published in:Nature communications 2013, Vol.4 (1), p.2344-2344, Article 2344
Main Authors: Zhao, Xiang, Bu, Xianhui, Wu, Tao, Zheng, Shou-Tian, Wang, Le, Feng, Pingyun
Format: Article
Language:English
Subjects:
639/638/263
639/638/298/921
Chromatography
Humanities and Social Sciences
Indium
Ligands
multidisciplinary
Pore size
Porous materials
Science
Science (multidisciplinary)
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Summary: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. Crystalline porous materials are commonly based around negatively charged frameworks, so ion-exchange is limited to cations. Here, the authors report a series of positive metal-organic frameworks, capable of ion exchange of large organic anions, with potential in separation and purification applications.
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms3344