Heterometallic [Cu₂Ln₃] (Ln = Dy^III, Gd^III and Ho^III) and [Cu₄Ln₂] (Ln = Dy^III and Ho^III) Compounds: Synthesis, Structure, and Magnetism

Abstract

The syntheses, structures, and magnetic properties of the penta‐ and hexanuclear 3d/4f complexes [Ln 3 Cu 2 (LH) 4 (MeOH)]ClO 4 [Ln = Dy III ( 1 ), Gd III ( 2 ), and Ho III ( 3 )] and [Ln 2 Cu 4 (LH) 4 ](ClO 4 ) 2 [Ln = Dy III ( 4 ) and Ho III ( 5 )] are reported. These complexes are assembled from the ligand 2,2′‐{2‐hydroxy‐3‐[(2‐hydroxyphenylimino)methyl]‐5‐methylbenzylazanediyl}diethanol (LH 4 ); four triply deprotonated ligands are involved in the formation of these complexes. In spite of the different nuclearities, some structural features are common. In both of the families, the metal ions are connected to each other by two bridging oxygen atoms, which emanate from either an ethoxide group or a phenolate group of [LH] 3– . Detailed magnetochemical analyses of 1 – 5 indicate that 1 and 5 display temperature‐dependent out‐of‐phase signals up to 12 K in the absence of a direct‐current (dc) field; therefore, these compounds are single‐molecule magnets.