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Charge-Separated and Lewis Paired Metal-Organic Framework for Anion Exchange and CO2 Chemical Fixation.
Chemistry - A European Journal ( IF 4.3 ) Pub Date : 2020-07-03 , DOI: 10.1002/chem.202002823
Sheela Thapa 1 , Lingyao Meng 1 , Eshani Hettiarachchi 2 , Yousef K Bader 1 , Diane A Dickie 3 , Gayan Rubasinghege 2 , Sergei A Ivanov 4 , Erika C Vreeland 5 , Yang Qin 1
Affiliation  

Charge‐separated metal–organic frameworks (MOFs) are a unique class of MOFs that can possess added properties originating from the exposed ionic species. A new charge‐separated MOF, namely, UNM‐6 synthesized from a tetrahedral borate ligand and Co2+ cation is reported herein. UNM‐6 crystalizes into the highly symmetric P43n space group with fourfold interpenetration, despite the stoichiometric imbalance between the B and Co atoms, which also leads to loosely bound NO3 anions within the crystal structure. These NO3 ions can be quantitatively exchanged with various other anions, leading to Lewis acid (Co2+) and Lewis base (anions) pairs within the pores and potentially cooperative catalytic activities. For example, UNM‐6‐Br, the MOF after anion exchange with Br anions, displays high catalytic activity and stability in reactions of CO2 chemical fixation into cyclic carbonates.

中文翻译:

用于阴离子交换和CO2化学固定的电荷分离和路易斯配对金属有机骨架。

电荷分离的金属有机骨架(MOF)是一类独特的MOF,可以具有源自暴露离子物种的附加特性。本文报道了一种新的电荷分离MOF,即由四面体硼酸盐配体和Co 2+阳离子合成的UNM-6 。UNM-6 crystalizes到高度对称P 43 Ñ与四倍穿插空间群,尽管B和Co原子之间的化学计量不平衡这也导致松散结合的NO 3 -的晶体结构内的阴离子。这些NO 3 -离子可定量与各种其它阴离子交换,从而导致路易斯酸(共2+)和路易斯碱(阴离子)对在孔隙内和潜在的协同催化活性。例如,UNM -6-溴,溴与阴离子交换后的MOF -阴离子,显示高的催化活性和稳定性中的CO反应2化学固定到环状碳酸酯。
更新日期:2020-07-03
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