Abstract
The oxalate ligand bridged mixed-metal molecular compounds NBu4CoII0.5FeII0.5[CrIII(ox)3], 1, and NBu4CoII0.5FeII0.5[FeIII(ox)3], 2, (where NBu+4 = tetra-n-butyl ammonium ion, ox2— = oxalate ion) were prepared. Their magnetic properties were studied in the temperature range of 5 to 300 K in zero-field-cooled as well as field-cooled conditions. Both compounds exhibited some disordered spin structure at low temperatures. The magnetic transition temperatures for these compounds were determined from the temperature dependence of the remnant magnetization under a very low field, which are 15 and 37 K for compound 1 and 2, respectively. The compound 1 is ferromagnetic, whereas the compound 2 is ferrimagnetic in nature. The molar magnetic susceptibility variation with temperature obeys the Curie-Weiss law at higher temperatures (>100 K). Compound 2 shows an anisotropic behavior in the hysteresis curve.
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