engleski

Magnetism of copper(II)/zinc(II)-MOF-74 compounds obtained over three different synthetic pathways

We present the results of studying the magnetic properties of three multivariate zinc(II)/copper(II)-MOF-74 materials. Two of them, CuZn-MOF-74 and ZnCu-MOF-74, were obtained through the template-controlled mechanochemical procedure, from magnetically interesting Cu-intermediate or non-magnetic Zn-intermediate. The third one, Zn-Cu-MOF-74-alloyed, was obtained by mechanical alloying, growing MOF-74 structure from mechanically amorphized Cu-MOF-74 and Zn-MOF-74 mixture by the accelerated aging process.[1, 2, 3] While the three product materials have almost identical PXRD and FTIR spectra, they differ significantly in their magnetic properties, obtained by very detailed magnetization, X-band, multifrequency high-field ESR, and solid-state NMR measurements. The results were compared to the low-dimensional antiferromagnetic behaviour observed in both monometallic Cu-MOF-74 and Cu-intermediate, and to the magnetic properties of other similar monometallic compounds: Fe-MOF-74, Co-MOF-74, and Ni-MOF-74.

MOF ; MOF-74 ; Cu(II) ; Zn(II) ; EPR ; ESR ; magnetism

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