Synthesis, structural characterization and magnetic behaviour of a family of [CoIII2LnIII2] butterfly compounds

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

DALTON TRANSACTIONS

ROYAL SOC CHEMISTRY

Lugar: CAMBRIDGE; Año: 2017 vol. 46 p. 3400 - 3409

1477-9226

We successfully have prepared and structurally characterized a family of butterfly-like [CoIII2LnIII2] complexes where all magnetic properties are due to the Ln(III) ions. The complexes with Ln= Tb(1), Dy(2), Ho(3), Er(4) and Yb(5) are iso-structural. An exception is the complex with Ln= Gd(6) which strings in a one dimensional chain. The structural similarity together with the high tendency of the crystallites to align under applied magnetic field, allowed an overall DC magnetic data treatment to extract reliable crystal field parameters and hence to determine the ground state multiplet energy level splitting. The Dy(III) member is the only one showing slow relaxation of magnetization under zero DC applied field, while all the others need a small DC applied field.