Magnetic properties of mixed copper/zinc MOF-74 compounds and their amorphous phases

Here we present the results of the study of magnetic properties of copper(II)-MOF-74 materials (Cu-MOF-74) and their three mixed analogues with zinc(II). CuZn-MOF-74 and ZnCu-MOF-74 were obtained through different intermediate complexes, namely from magnetically also interesting Cu-INT or from non-magnetic Zn-INT, respectively. The alloyed Cu-MOF-74-Zn-MOF-74 was obtained by growing the MOF structure from the mixture of milled Cu-MOF-74 and Zn-MOF-74 exposed to solvent vapors (accelerated ageing).[1] Additionally, we investigated how the amorphization process influences the magnetic properties of studied crystalline copper/zinc MOF-74 compounds.[2] Magnetic characterization was obtained by static magnetization measurements, X-band electron spin resonance (ESR) spectroscopy as well as multifrequency high-field high-frequency ESR (HF- ESR) spectroscopy. [1] G. Ayoub et al, Chem. Mater. 31 (2019) 5494. [2] S. Muratović et al, J. Mater. Chem. C 8 (2019) 7132.