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

preprint
submitted on 17.10.2019 and posted on 21.10.2019 by Stefano Canossa, Adrian Gonzalez-Nelson, Leonid Shupletsov, María del Carmen Martín, Monique van der Veen
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 (MOFs). 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.

Funding

This work was funded by the European Research Council (grant number 759212) within the Horizon 2020 Framework Programme (H2020-EU.1.1)

The work by A.G.-N. forms part of the research programme of DPI, NEWPOL project 731.015.506.

History

Email Address of Submitting Author

a.m.gonzaleznelson@tudelft.nl

Institution

Delft University of Technology

Country

The Netherlands

ORCID For Submitting Author

0000-0003-2104-3870

Declaration of Conflict of Interest

No conflict of interest

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