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      One-pot synthesis of UiO-66@SiO2 shell–core microspheres as stationary phase for high performance liquid chromatography

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          Abstract

          A facile one-pot synthesis of UiO-66@SiO 2 shell–core microspheres as HPLC stationary phase was reported.

          Abstract

          The unusual properties of ultrahigh surface area, adsorption affinity and shape selectivity make metal–organic frameworks (MOFs) a promising candidate as the stationary phase for high performance liquid chromatography (HPLC). However, the problems of high column backpressure and low column efficiency resulting from the direct packing of irregular MOF particles still remain in the HPLC separation. Herein, a facile one-pot synthesis method for the fabrication of MOFs@SiO 2 shell–core microspheres was developed with aminosilica as the supporting substrate to grow the MOF shell. The density and particle size of the MOF shell could be easily controlled by adjusting the concentration of reactants, reaction temperature and time. UiO-66 (UiO for University of Oslo) was chosen as a model MOF because of its excellent chemical stability and unique reverse shape selectivity. The selected compounds including xylenes and ethylbenzene were effectively separated on the prepared UiO-66@SiO 2 packed column with high resolution, good reproducibility and low column backpressure. The UiO-66@SiO 2 packed column showed both reverse shape selectivity and a molecular sieving effect, making it attractive for the separation of structural isomers. Besides, the retention of analytes was also ascribed to the synergic effect of the hydrogen bonding between analytes and the amino groups of aminosilica, the hydrophobic effect and the π–π interaction between analytes and the aromatic rings of the UiO-66 shell.

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          Most cited references 31

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          Functional Porous Coordination Polymers

          The chemistry of the coordination polymers has in recent years advanced extensively, affording various architectures, which are constructed from a variety of molecular building blocks with different interactions between them. The next challenge is the chemical and physical functionalization of these architectures, through the porous properties of the frameworks. This review concentrates on three aspects of coordination polymers: 1). the use of crystal engineering to construct porous frameworks from connectors and linkers ("nanospace engineering"), 2). characterizing and cataloging the porous properties by functions for storage, exchange, separation, etc., and 3). the next generation of porous functions based on dynamic crystal transformations caused by guest molecules or physical stimuli. Our aim is to present the state of the art chemistry and physics of and in the micropores of porous coordination polymers.
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            A microporous metal-organic framework for gas-chromatographic separation of alkanes.

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              Adsorptive separation on metal-organic frameworks in the liquid phase.

              While much attention of the MOF community has been devoted to adsorption and purification of gases, there is now also a vast body of data on the capability of MOFs to separate and purify liquid mixtures. Initial studies focused on separation of petrochemicals in apolar backgrounds, but the attention has moved now to the separation of complex, e.g. chiral compounds, and to the isolation of biobased compounds from aqueous media. We here give an overview of most of the existing literature, with an accent on separation mechanisms and structure-selectivity relationships.
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                Author and article information

                Journal
                RSCACL
                RSC Advances
                RSC Adv.
                Royal Society of Chemistry (RSC)
                2046-2069
                2015
                2015
                : 5
                : 2
                : 1043-1050
                Affiliations
                [1 ]Beijing Key Laboratory for Microanalytical Methods and Instrumentation
                [2 ]Department of Chemistry
                [3 ]Tsinghua University
                [4 ]Beijing
                [5 ]China
                Article
                10.1039/C4RA12263A
                © 2015
                Product
                Self URI (article page): http://xlink.rsc.org/?DOI=C4RA12263A

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