Issue 39, 2023

Development of MOF-5-like ultra-microporous metal-squarate frameworks for efficient acetylene storage and separation

Abstract

Although MOF-5 and its related family members are landmark metal–organic frameworks (MOFs), they have large specific surface area and high porosity, which have long been a subject regarding their instability. The introduction of new inorganic building blocks, in addition to classical [Zn4O(COO)6], is a promising way to maintain the highly attractive architecture of MOF-5. Herein, a family of new MOF-5-like frameworks were synthesized by using squaric acid (SQ) and transition metal salts, namely, {(NH(CH3)2)2[M4X4(SQ)3]}n (SNNU-505-M, M = Zn, Co and Ni, X = F and OH). In this SNNU-505-M series of compounds, except for the μ3-bridging atom of SNNU-505-Zn being an F ion, all the others are OH. Compared with MOF-5, SNNU-505-M exhibits good stability in organic solvent and aqueous solutions (pH = 3–13). Furthermore, benefiting from its ultra-micropore size and multiple polarity F/OH adsorption sites, SNNU-505-M shows high C2H2 adsorption capacity and excellent separation performance. In particular, SNNU-505-Zn exhibits the best C2H2/C2H4 (1 : 1) separation performance and its breakthrough interval time is 51 min g−1 at 298 K at a flow rate of 2 mL min−1. The GCMC calculations further demonstrate that the excellent C2H2 uptake and C2H2/C2H4 separation performance of SNNU-505-Zn can be mainly attributed to the multiple C–H⋯F hydrogen bonds between the C2H2 molecules and MOF skeleton.

Graphical abstract: Development of MOF-5-like ultra-microporous metal-squarate frameworks for efficient acetylene storage and separation

Supplementary files

Article information

Article type
Paper
Submitted
08 Aug 2023
Accepted
06 Sep 2023
First published
06 Sep 2023

J. Mater. Chem. A, 2023,11, 21203-21210

Development of MOF-5-like ultra-microporous metal-squarate frameworks for efficient acetylene storage and separation

H. Li, J. Wang and Q. Zhai, J. Mater. Chem. A, 2023, 11, 21203 DOI: 10.1039/D3TA04732F

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