Slow magnetic relaxation and strong magnetic coupling in the nitroxyl radical complexes of Lanthanide(III) with diamagnetic ground state (Ln = Lu, Eu)

A combined EPR and magnetic study of [LnRad(NO 3 ) 3 ], supported by calculations, unveiled an unprecedentedly large antiferromagnetic coupling between Eu 3+ and radical spins with slow magnetization dynamics below 20 K discovered for Eu and Lu species.