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Catalysis and photocatalysis by metal organic frameworks

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      Abstract

      This review aims to provide different strategies employed to use MOFs as solid catalysts and photocatalysts in organic transformations.

      Abstract

      Metal organic frameworks (MOFs) are a class of porous crystalline materials that feature a series of unique properties, such as large surface area and porosity, high content of transition metals, and possibility to be designed and modified after synthesis, that make these solids especially suitable as heterogeneous catalysts. The active sites can be coordinatively unsaturated metal ions, substituents at the organic linkers or guest species located inside the pores. The defects on the structure also create these open sites. The present review summarizes the current state of the art in the use of MOFs as solid catalysts according to the type of site, making special emphasis on the more recent strategies to increase the population of these active sites and tuning their activity, either by adapting the synthesis conditions or by post-synthetic modification. This review highlights those reports illustrating the synergy derived from the presence of more than one of these types of sites, leading to activation of a substrate by more than one site or to the simultaneous activation of different substrates by complementary sites. This synergy is frequently the main reason for the higher catalytic activity of MOFs compared to homogeneous catalysts or other alternative solid materials. Besides dark reactions, this review also summarizes the use of MOFs as photocatalysts emphasizing the uniqueness of these materials regarding adaptation of the linkers as light absorbers and metal exchange at the nodes to enhance photoinduced electron transfer, in comparison with conventional inorganic photocatalysts. This versatility and flexibility that is offered by MOFs to optimize their visible light photocatalytic activity explains the current interest in exploiting these materials for novel photocatalytic reactions, including hydrogen evolution and photocatalytic CO 2 reduction.

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            Author and article information

            Affiliations
            [1 ]School of Chemistry
            [2 ]Madurai Kamaraj University
            [3 ]Madurai-625 021
            [4 ]India
            [5 ]Research Institute of Photocatalysis
            [6 ]State Key Laboratory on Photocatalysis
            [7 ]Fuzhou University
            [8 ]Fuzhou 350002
            [9 ]People's Republic of China
            [10 ]Department of Chemistry and Instituto de Tecnología Química
            [11 ]Consejo Superior de Investigaciones Científicas-Universitat Politecnica de Valencia
            [12 ]Universitat Politecnica de Valencia
            [13 ]46022 Valencia
            [14 ]Spain
            Journal
            CSRVBR
            Chemical Society Reviews
            Chem. Soc. Rev.
            Royal Society of Chemistry (RSC)
            0306-0012
            1460-4744
            November 12 2018
            2018
            : 47
            : 22
            : 8134-8172
            10.1039/C8CS00256H
            © 2018

            http://rsc.li/journals-terms-of-use

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            Self URI (article page): http://xlink.rsc.org/?DOI=C8CS00256H

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