Versatility of the nature of the magnetic gadolinium(III)-vanadium(IV) interaction - Structure and magnetic properties of two heterobinuclear [Gd, V(O)] complexes

It has been known for a long time that the magnetic exchange interaction be tween copper and gadolinium ions is always ferromagnetic. Very recently, th ree exceptions to this general trend were revealed. They involve complexes associating a gadolinium(III) ion with a copper(II) ion or with radicals of the nitroxide or semiquinone types. We want to show that this trend is mor e general than expected, for such a behavior can also be observed in hetero binuclear vanadyl-gadolinium complexes.