Heterometallic coordination polymers containing unique inorganic chain of [Lniii2Cuii3(OH)4]: syntheses, structures and magnetism

Abstract

Heterometallic compounds of [Ln₂Cu₃(OH)₄(pyba)₈(H₂O)₂]_n (1–5) (Hpyba = 4-(4-pyridyl)benzoic acid, Ln = La 1, Pr 2, Sm 3, Eu 4, Gd 5) were hydrothermally synthesized by using lanthanide oxides, Hpyba, and copper halide as raw materials. Structurally, the two-dimensional frameworks of 1–5 possess the very original heterometallic chain moiety of [Ln^III₂Cu^II₃(μ₃-OH)₄], which is the first inorganic chain in 3d–4f chemistry. Variable temperature magnetic susceptibility studies show that 5 displays weak antiferromagnetic coupling between the neighboring Gd(III) and Cu(II) ions.