Charge‐Separated and Lewis Paired Metal–Organic Framework for Anion Exchange and CO₂ Chemical Fixation.

Thapa, Sheela; Meng, Lingyao; Hettiarachchi, Eshani; Bader, Yousef K.; Dickie, Diane A.; Rubasinghege, Gayan; Ivanov, Sergei A.; Vreeland, Erika C.; Qin, Yang

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.

LEWIS pairs (Chemistry); METAL-organic frameworks; CHEMICAL reactions; ANIONS; LEWIS bases; ION-permeable membranes; PYRAZOLYL compounds

Chemistry - A European Journal, 2020, Vol 26, Issue 61, p13788

0947-6539

Academic Journal

10.1002/chem.202002823