engleski

Mechanochemical route for the synthesis of magnetic copper-zinc MOF-74 materials

Metal-organic frameworks (MOFs) are porous crystalline materials formed by coordination bonding between organic ligands and metal ions (or metal-oxo clusters). Many of them are being studied for potential application, notably, bimetallic MOFs that generally outperform their corresponding monometallic analogues [1]. Solution synthesis methods lack control over the stoichiometric ratio and the spatial arrangement of the metal centers within the framework. New synthetic strategies, such as mechanochemical synthesis, overcome these issues [2]. Here, three bimetallic MM’-MOF-74 materials, comprised of zinc (II) and copper (II) metal nodes in a 1:1 ratio, were prepared by different mechanochemical approaches and from different polymeric precursors. Synthesized materials are indistinguishable by powder X-ray diffraction (PXRD) while electron paramagnetic resonance spectroscopy (EPR) and magnetic measurements revealed the different distribution of metals in the MOFs. This was furthermore clarified by different mechanisms of framework assembly observed during in situ monitoring of reactions by synchrotron PXRD [3]. [1] L. Chen et al. Chem. Sci. 11 (2020) 5369-5403. [2] G. Ayoub et al. Chem. Mater. 31 (2019) 5494-5501. [3] S. Muratović et al. Inorg. Chem. 61 (2022) 18181-18192.

mechanochemistry ; magnetism ; MOF-74

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