Modulating Relaxation Dynamics of Dy2 Compounds through Carboxylate Coordination Modes

Abstract The reaction of the rigid polydentate Schiff‐base H 3 L with different dysprosium carboxylates afforded two novel centrosymmetrical dinuclear Dy III compounds, [Dy 2 (HL) 2 (CH 3 COO) 2 (DMF) 2 ] ( 1 ) and [Dy 2 (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 η 1 :η 1 :μ 2 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 η 2 ‐chelating benzoate ligands.