Abstract
Twelve oxamide-bridged Ln(III)–Cu(II) heteropentanuclear complexes Ln[Cu(PMoxd)]4(ClO4)3 · 5H2O (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, and PMoxd = the N,N′-Bi(α-pyridylmethyl)-oxamide dianion) and 12 oxamide-bridged Ln(III)–Cu(II) heteropentanuclear complexes with the formula of Ln[Cu(PEoxd)]4(ClO4)3 · 5H2O (PEoxd = the N,N′-Bi(α-pyridylethyl)-oxamide dianion) were synthesized and characterized. The magnetic properties of Gd[Cu(PMoxd)]4(ClO4)3 · 5H2O (7) and Gd[Cu(PEoxd)]4(ClO4)3 · 2H2O (19) show that there are ferromagnetic interactions between Gd(III) and Cu(II) in the complexes with J Cu–Gd = 1.38 cm−1 and J Cu–Gd = 1.00 cm−1, respectively. Fluorescent quenching phenomena for Eu[Cu(PMoxd)]4(ClO4)3 · 5H2O (6) and Tb[Cu(PMoxd)]4(ClO4)3 · 5H2O (8) were also observed.
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