Systematic Tuning of the Magnetic Properties in Mixed-Metal MOF-74
Megumi Mukoyoshi, Mitsuhiko Maesato, Shogo Kawaguchi, Yoshiki Kubota, Keigo Cho, Yasutaka Kitagawa, Hiroshi Kitagawa
Abstract
Recently, mixed-metal metal–organic frameworks (MOFs) have been attracting much attention in various fields. In this study, we have systematically investigated the magnetic properties of CoxNi1–x-MOF-74 [Co2xNi2(1–x)(dhtp), where H4dhtp = 2,5-dihydroxyterephthalic acid] with two different kinds of metals (Co and Ni) across the composition range 0 ≤ x ≤ 1. Bimetallic CoxNi1–x-MOF-74 (x = 0.752, 0.458, and 0.233) were successfully synthesized and confirmed to have homogeneous metal distributions. Weak ferromagnetic (canted antiferromagnetic) behavior was exhibited, while homometallic Co-MOF-74 and Ni-MOF-74 are antiferromagnetic. We also investigated the effects of C2H4 sorption on the magnetic properties and found that C2H4-adsorbed Co0.5Ni0.5-MOF-74 exhibited a change in the interchain magnetic interaction.