Peripheral site modification in a family of dinuclear [Dy₂(hynad)_2–6(NO₃)_0–6(sol)_0–2]^0/2− single-molecule magnets bearing a {Dy₂(μ-OR)₂}⁴⁺ diamond-shaped core and exhibiting dissimilar magnetic dynamics

Abstract

A new family of four dinuclear DyIII complexes bearing the same {Dy2(μ-OR)2}4+ core but different peripheral ligands has been isolated; all complexes exhibit slow relaxation of their magnetization and SMM properties.

Effect of coordinated anions on ferromagnetically coupled Dy2 zero-field single-molecule magnets

“…2,15–19 The higher the number of lanthanide ions, the less likely it is to have the same axis orientation; therefore, the SMMs containing only two lanthanide( iii ) ions are attracting more and more attention. 20–42 If a lanthanide( iii ) dinuclear SMM exhibits ferromagnetic interaction, the magnetic axis orientation of the two lanthanide( iii ) ions can be consistent, but this is a great challenging task; the reason is that the 4f electrons of different lanthanide( iii ) ions are not prone to magnetic exchange; even when the magnetic exchange occurs, it is usually a weak antiferromagnetic coupling. Notably, the ferromagnetic coupling between cations in lanthanide( iii ) SMMs may suppress the quantum tunnelling effect, which facilitates the presentation of SMM behavior in the zero field.…”