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Overcoming Crystallinity Limitations of Aluminium Metal‐Organic Frameworks by Oxalic Acid Modulated Synthesis
Author(s) -
Canossa Stefano,
GonzalezNelson Adrian,
Shupletsov Leonid,
Carmen Martin Maria,
Van der Veen Monique A.
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201904798
Subject(s) - oxalic acid , crystallinity , hydrofluoric acid , metal organic framework , aluminium , impurity , metal , materials science , chelation , modulation (music) , inorganic chemistry , chemistry , organic chemistry , metallurgy , composite material , physics , adsorption , acoustics
A modulated synthesis approach based on the chelating properties of oxalic acid (H 2 C 2 O 4 ) 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, CH 3 O, Br, NO 2 ), 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.