Zirconium-based metal–organic frameworks

Metal-organic frameworks (MOFs) are relatively new porous hybrid coordination polymers that consist of inorganic nodes linked together by organic ligands called linkers. These crystalline materials are being tested for many applications. Environmental applications, especially water purification by sorption or catalytic decomposition of pollutants, are also one of the possibilities. However, these applications require an aqueous environment, and here MOFs hit their limit, which is their low stability in water.
In this work, the authors deal with four zirconium-based MOFs. The wokr aims to describe which parameters have an effect on the stability of MOFs in an aqueous environment at different pH values. It was found that the choice of the organic building unit, so-called linker, plays a significant role in the stability of the resulting MOFs. This work also refutes some generally accepted assumptions about the stability of MOFs. For example, higher connectivity leads to more stable MOFs. As this work demonstrated, the number of coordinating carboxyl groups on the linker has a greater influence on stability then connectivity. The more carboxylate groups on the linker led to more stable MO. Furthermore, in this work, the observed structural changes were related to the catalytic activity of the studied MOFs for the decomposition of toxic organophosphates.

BŮŽEK, Daniel; HYNEK, Jan; KLODA, Matouš; ZLÁMALOVÁ, Veronika; BEZDIČKA, Petr et al. Zirconium-based metal–organic frameworks: the relation between linker connectivity, structure stability, and catalytic activity towards organophosphates. Online. Inorganic Chemistry Frontiers. 2024, roč. 11, č. 16, s. 5319-5335. ISSN 2052-1553. Available from: https://doi.org/10.1039/D4QI01366B.
Link: https://pubs.rsc.org/en/content/articlelanding/2024/qi/d4qi01366b

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