Charge-Separated and Lewis Paired Metal-Organic Framework for Anion Exchange and CO 2 Chemical Fixation.

Authors :: Thapa S
Meng L
Hettiarachchi E
Bader YK
Dickie DA
Rubasinghege G
Ivanov SA
Vreeland EC
Qin Y
Source :: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2020 Nov 02; Vol. 26 (61), pp. 13788-13791. Date of Electronic Publication: 2020 Oct 16.
Publication Year :: 2020
Abstract: 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 <superscript>2+</superscript> 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 NO <subscript>3</subscript> <superscript>-</superscript> anions within the crystal structure. These NO <subscript>3</subscript> <superscript>-</superscript> ions can be quantitatively exchanged with various other anions, leading to Lewis acid (Co <superscript>2+</superscript> ) 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 <superscript>-</superscript> anions, displays high catalytic activity and stability in reactions of CO <subscript>2</subscript> chemical fixation into cyclic carbonates.<br /> (© 2020 Wiley-VCH GmbH.)

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