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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Selective CO2 adsorption and Lewis acid catalytic activity towards naphthimidazole synthesis by a Zn-MOF
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Selective CO2 adsorption and Lewis acid catalytic activity towards naphthimidazole synthesis by a Zn-MOF

机译:通过Zn-MOF选择性CO 2吸附和Lewis酸催化活性朝向萘唑合成

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摘要

A two-fold interpenetrated, three dimensional Zn-based porous MOF, {[Zn(BPBA)Cl]center dot 5H(2)O}(n) (1) [BPBA = 3,5-bis-(4-oxo-4H-pyridin-1-yl)-benzoate], has been synthesized at high temperature under solvothermal conditions by the in situ acidic hydrolysis of the tripodal ligand 3,5-bis-(4-oxo-4H-pyridin-1-yl)-benzonitrile (BPBN). The de-solvated MOF exhibited selective CO2 adsorption at a temperature of 195 K and 1 bar pressure over N-2 and H-2. Interestingly, the four coordinated Zn(II) sites in the MOF exhibited high Lewis acidic heterogeneous catalytic activity for the synthesis of naphthimidazole in excellent yield without pre-activation of the MOF. The Zn(II) sites could directly coordinate to the substrate to catalyze the chemical transformation by an expansion of the coordination number. The pi-pi supramolecular interactions between the aromatic rings of the framework and the substrate molecule might help in the substrate activation. (C) 2020 Elsevier Ltd. All rights reserved.
机译:渗透渗透的三维Zn基多孔MOF,{[Zn(BPBA)Cl]中心点5H(2)O}(N)(1)[BPBA = 3,5-双 - (4-氧代 - 4H-吡啶-1-基) - 苯甲酸酯]通过偶然配体3,5-双 - (4-氧代-4H-吡啶-1-基)的原位酸性水解在溶剂温条件下在高温下合成-Benzonitrile(BPBN)。去溶剂化的MOF在N-2和H-2上的温度下表现出在195k和1巴压力的温度下的选择性CO 2吸附。有趣的是,MOF中的四个协调Zn(II)位点表现出高Lewis酸性异质催化活性,用于合成萘咪唑,其优异产量在不激活MOF的情况下。 Zn(II)位点可以直接与基材协调,以通过膨胀协调数来催化化学转化。框架的芳环之间的PI-PI超分子相互作用和基材分子可能有助于底物活化。 (c)2020 elestvier有限公司保留所有权利。

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