Conclusive Demonstration of the Ferromagnetic Nature of the Interaction Between Holmium(III) and Aminoxyl Radicals

Metal–organo magnetic interactions involving lanthanideshave become important in the search for molecular magnetic materials. Here is reported the synthesis of a holmium(III)–nitronyl oxide compound (see Figure). The temperature dependence of its magnetic susceptibility reveals that it has a ferromagnetic ground state, which verifies theoretical predictions.