Khudozhitkov AE, Arzumanov SS, Toktarev AV, Cherepanova SV, Gabrienko AA, Kolokolov DI, Stepanov AG. Dissecting the effects of water guest adsorption and framework breathing on the AlO
4(OH)
2 centres of metal-organic framework MIL-53 (Al) by solid state NMR and structural analysis.
Phys Chem Chem Phys 2021;
23:18925-18929. [PMID:
34612431 DOI:
10.1039/d1cp03060d]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The relationship between the adsorption of water on MIL-53 (Al) MOF, the structural phase of MIL-53 (Al), and the quadrupole coupling constant of 27Al framework aluminium atom (QCC) of the MOF AlO4(OH)2 centres (Al-sites) has been investigated by combining solid-state 27Al MAS NMR spectroscopy with XRD analysis and DFT calculations. It is established that 27Al QCC is primarily sensitive to water adsorption to the Al-sites and by a minor extent to the framework contraction/expansion interconversions. We thus conclude that the 27Al MAS NMR method is sensitive enough to differentiate the effects of pore contractions and water adsorption to Al-sites basing on the changes of the QCC value.
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