Issue 17, 2022

Electrostatic force-driven lattice water bridging to stabilize a partially charged indium MOF for efficient separation of C2H2/CO2 mixtures

Abstract

Highly stable metal–organic frameworks (MOFs) with accessible sites have gradually been valued because of their excellent performance. Here, we proposed a steric hindrance effect to construct a partially charged MOF with electrostatic forces for efficient C2H2/CO2 separation. Two MOFs, [Me2NH2]·[In(BDTA)] 5.5DMF·4H2O (FJU-117, BDTA is [4,4′,4′′,4′′′-([1,1′-biphenyl]-4,4′-diylbis(azanetriyl)) tetrabenzoic acid]) and [In(4Me-BDTA)·0.5H2O]·6DMF·2H2O (FJU-118) were synthesized using a similar procedure except that BDTA in FJU-117 was replaced with 4Me-BDTA in FJU-118. The four methyl groups in 4Me-BDTA in FJU-118 obviously restrict the rotation of the two C–N bonds of ligands. The steric hindrance effect of the 4Me-BDTA results in 7-coordinated In3+ ions in FJU-118, compared to 8-coordinated ones in FJU-117. Accessible sites in FJU-118 with partially remaining charge can provide electrostatic force to anchor lattice water. Electrostatic force-driven lattice water bridging stabilizes the FJU-118 framework. The activated sample FJU-118a exhibits the third highest Brunauer–Emmett–Teller (BET)/Langmuir surface area (1860/2106 m2 g−1) among the reported indium MOFs. The absorption capacities for C2H2 and CO2 at 296/273 K are 88.6/155.1 cm3 g−1 and 35.6/66.9 cm3 g−1, respectively. The single crystal results show that the partially remaining charge on indium sites has an electrostatic force on the –C[triple bond, length as m-dash]C– bond of C2H2 molecules for the selective separation of C2H2/CO2 mixtures.

Graphical abstract: Electrostatic force-driven lattice water bridging to stabilize a partially charged indium MOF for efficient separation of C2H2/CO2 mixtures

Supplementary files

Article information

Article type
Communication
Submitted
10 Dec 2021
Accepted
03 Apr 2022
First published
05 Apr 2022

J. Mater. Chem. A, 2022,10, 9363-9369

Electrostatic force-driven lattice water bridging to stabilize a partially charged indium MOF for efficient separation of C2H2/CO2 mixtures

Q. Song, Y. Yang, F. Yuan, S. Zhu, J. Wang, S. Xiang and Z. Zhang, J. Mater. Chem. A, 2022, 10, 9363 DOI: 10.1039/D1TA10569H

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