Syntheses, structures, and properties of a series of novel high-nuclear 3d–4f clusters with mixed amino acids as ligands: {Ln6Cu24}(Ln = Gd, Tb, Pr and Sm)

Abstract

The first examples of high-nuclear 3d–4f heterometallic clusters with mixed amino acid ligands are reported. Four 30-nuclear clusters {Ln₆Cu₂₄}(Ln = Gd, Tb, Pr and Sm) were obtained through the self-assembly of Ln^III, Cu^II and mixed amino acid ligands of glycine (HGly) and β-alanine (HAla). The metal skeleton of clusters 1–4 may be described as a huge {Ln₆Cu₁₂} octahedron connected with 12 additional Cu^II ions. The temperature dependence of magnetic susceptibilities of compounds 1–4 were also studied.