Synthesis, characterization and magnetism of copper ( Ⅱ ) -lan-thanide(Ⅲ) heterobimetalic complexes with N, N＇-oxamidobis-(benzoato) cuprate (Ⅱ)

• 来源期刊: 中国化学(英文版)
• 年，卷（期）: 2000,（6）
• 所属期刊栏目: Articles
• 页码范围: 849-854
• 页数: 6页
• 语种: 英文

摘要

Seven new μ-oxamido copper(Ⅱ)-lanthanide(Ⅲ) hetero-bimetalic complexes complexes by the formula Cu(obbz)Ln-(Ph-phen)2NO3(Ln = La, Nd, Eu, Gd, Tb, Ho, Er),where obbz denotes the oxamidobis menzoatob) and Ph-phen represents 5-phenyl-1, 10-phenanthroline, have been synthesized and characterized by the elemental analyses, spectroscopic (IR, UV, ESR) studies, magnetic moments (at room temperature) and molar conducivity measurement. The temperature dependence of the magnetic susceptibility of Cu(ob-bz)Gd(Ph-phen)2NO3 complex has been measured over the range 4.2-300 K. The least-squares fit of experimental susceptibilities based on the spin Hamitonian, H=-2JS1- S2, yielded J = + 1.28 cm1, a weak ferromagnetic coupting. A plausible mechanism for a ferromagnetic coupling between Gd(Ⅲ)-Cu(Ⅱ) is discussed in terms of spin-polar-ization.