A robust ultra-microporous cationic aluminum-based metal-organic framework with a flexible tetra-carboxylate linker

Autor: Shyamapada Nandi, Asma Mansouri, Iurii Dovgaliuk, Philippe Boullay, Gilles Patriarche, Ieuan Cornu, Pierre Florian, Georges Mouchaham, Christian Serre
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Communications Chemistry, Vol 6, Iss 1, Pp 1-9 (2023)
Druh dokumentu: article
ISSN: 2399-3669
DOI: 10.1038/s42004-023-00938-x
Popis: Abstract Al-based cationic metal-organic frameworks (MOFs) are uncommon. Here, we report a cationic Al-MOF, MIP-213(Al) ([Al18(μ 2-OH)24(OH2)12(mdip)6]6Cl·6H2O) constructed from flexible tetra-carboxylate ligand (5,5'-Methylenediisophthalic acid; H4mdip). Its crystal structure was determined by the combination of three-dimensional electron diffraction (3DED) and high-resolution powder X-ray diffraction. The structure is built from infinite corner-sharing chains of AlO4(OH)2 and AlO2(OH)3(H2O) octahedra forming an 18-membered rings honeycomb lattice, similar to that of MIL-96(Al), a scarce Al-polycarboxylate defective MOF. Despite sharing these structural similarities, MIP-213(Al), unlike MIL-96(Al), lacks the isolated μ 3 -oxo-bridged Al-clusters. This leads to an ordered defective cationic framework whose charge is balanced by Cl- sandwiched between two Al-trimers at the corner of the honeycomb, showing strong interaction with terminal H2O coordinated to the Al-trimers. The overall structure is endowed by a narrow quasi-1D channel of dimension ~4.7 Å. The Cl- in the framework restrains the accessibility of the channels, while the MOF selectively adsorbs CO2 over N2 and possesses high hydrolytic stability.
Databáze: Directory of Open Access Journals
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