Self-Assembly Heterometallic Cu-Ln Complexes: Synthesis, Crystal Structures and Magnetic Characterization

Using N2O4 donor symmetric ligand H2L and dca co-ligand, two new isostructural dinuclear CuII–LnIII complexes [Cu(Cl)(L)Ln(NO3)(CH3OH)(H2O)(dca)] [Ln=Ho (1CuHo), Gd (2CuGd)] [H2L = 6,6′-((1E,1′E)-(ethane-1,2-diylbis(azaneylylidene))bis(methaneylylidene))bis(2-methoxyphenol); dca=dicyanamide] were designed, synthesized studied. In the compounds, geometric environment around nine-coordinated Ln(III) ions is muffin, whereas geometry of penta-coordinated Cu(II) square pyramid. The magnetic properties both also Direct current susceptibility measurements indicate ferromagnetic interactions between ion Gd(III) in complex 2CuGd. Alternating (ac) that 1CuHo displays slow relaxation behaviour.