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Charge‐Separated and Lewis Paired Metal–Organic Framework for Anion Exchange and CO 2 Chemical Fixation
Author(s) -
Thapa Sheela,
Meng Lingyao,
Hettiarachchi Eshani,
Bader Yousef K.,
Dickie Diane A.,
Rubasinghege Gayan,
Ivanov Sergei A.,
Vreeland Erika C.,
Qin Yang
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202002823
Subject(s) - lewis acids and bases , chemistry , stoichiometry , catalysis , ionic bonding , inorganic chemistry , boron , ion , metal , crystallography , ligand (biochemistry) , ion exchange , organic chemistry , receptor , biochemistry
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 Co 2+ cation is reported herein. UNM‐6 crystalizes into the highly symmetric P 43 n space group with fourfold interpenetration, despite the stoichiometric imbalance between the B and Co atoms, which also leads to loosely bound NO 3 − anions within the crystal structure. These NO 3 − ions can be quantitatively exchanged with various other anions, leading to Lewis acid (Co 2+ ) 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 CO 2 chemical fixation into cyclic carbonates.