Slow relaxation of magnetization in {CoIII2LnIII2} butterfly complexes

LUCA CARRELLA; EVA RENTSCHLER; ALEJANDRO V. FUNES; YVONE RECHKEMMER; JORIS VAN SLAGEREN; PABLO ALBORÉS

Puerto Iguazú

Simposio; 6th Latin American Symposium on Coordination and Organometallic Chemistry; 2017

The research field of Molecular Magnetism has been continuously increasingduring the last decades as Single Molecule Magnets (SMMs) show apromising avenue towards a variety of potential applications. SMMs could beused for high-density information storage, magnetic refrigerants or even playa crucial role in molecular spintronics. Single molecule magnets exhibit slowrelaxation of the magnetization hence potentially bistability, of exclusivelymolecular origin.We have successfully prepared and structurally characterized a family ofbutterfly-like [CoIII2LnIII2] complexes where all magnetic properties are dueto the Ln(III) ions. The complexes with Ln= Tb(1), Dy(2), Ho(3), Er(4) andYb(5) are iso-structural. An exception is the complex with Ln= Gd(6) whichstrings in a one dimensional chain. The structural similarity together with thehigh tendency of the crystallites to align under applied magnetic field,allowed an overall DC magnetic data treatment to extract reliable crystal fieldparameters and hence to determine the ground state multiplet energy levelsplitting. The Dy(III) member is the only one showing slow relaxation ofmagnetization under zero DC applied field, while all the others need a smallDC applied field.