Overcoming Crystallinity Limitations of Aluminium Metal-Organic Frameworks by Oxalic Acid Modulated Synthesis

Journal article (2020)

Authors

S. Canossa Universiteit Antwerpen,
A.M. Gonzalez Nelson Dutch Polymer Institute,
Leonid Shupletsov External organisation
Maria del Carmen Martin External organisation
Copyright: © 2020 S. Canossa, A.M. Gonzalez Nelson, Leonid Shupletsov, Maria del Carmen Martin, M.A. van der Veen
DOI: https://doi.org/10.1002/chem.201904798
Aluminium Crystal growth Metal-organic frameworks Chelates Modulated synthesis
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Published Date

2020

Language

English

Abstract

A modulated synthesis approach based on the chelating properties of oxalic acid (H2C2O4) is presented as a robust and versatile method to achieve highly crystalline Al-based metal-organic frameworks. A comparative study on this method and the already established modulation by hydrofluoric acid was conducted using MIL-53 as test system. The superior performance of oxalic acid modulation in terms of crystallinity and absence of undesired impurities is explained by assessing the coordination modes of the two modulators and the structural features of the product. The validity of our approach was confirmed for a diverse set of Al-MOFs, namely X-MIL-53 (X=OH, CH3O, Br, NO2), CAU-10, MIL-69, and Al(OH)ndc (ndc=1,4-naphtalenedicarboxylate), highlighting the potential benefits of extending the use of this modulator to other coordination materials.