Modulating Relaxation Dynamics of Dy2 Compounds through Carboxylate Coordination Modes

Abstract

The reaction of the rigid polydentate Schiff-base H3L with different dysprosium carboxylates afforded two novel centrosymmetrical dinuclear DyIII compounds, [Dy2(HL)2(CH3COO)2(DMF)2] (1) and [Dy2(HL)2(PhCOO)2(DMF)2]·4DMF (2) with differing carboxylate groups. The two differing carboxylate groups affect the magnetic interaction and/or local anisotropy of the Dy ion, and therefore we have two compounds showing dissimilar magnetic behaviour. The acetato bridging groups with a syn-syn η1:η1:μ2 mode in compound 1 lead to the disappearance of slow magnetic relaxation under zero dc field. Nevertheless, typical SMM behaviour is observed for compound 2 with η2-chelating benzoate ligands.