SIOC English
化学学报
高级检索

化学学报 ›› 1994, Vol. 52 ›› Issue (5): 485-488. 上一篇    下一篇

研究论文

氯冉酸阴离子桥联的Nd(III)-Nd(III), Dy(III)-Dy(III)和 Ho(III)-Ho(III)双 核配合物的合成与磁性

姜宗慧;刘宗明;廖代正;王耕霖   

  1. 南开大学元素有机化学国家重点实验室;南开大学化学系.天津(300071)
  • 发布日期:1994-05-15

Syntheses and magnetic properties of binuclear Nd(III)-Nd(III), Dy (III)-Dy(III) and Ho(III)-Ho(III) complexes with dianion of chloranilic acid as bridging ligands

Jiang Zonghui;Liu Zongming;Liao Daizheng;Wang Genglin   

  1. Nankai Univ, Dept Chem.Tianjin(300071)
  • Published:1994-05-15

PDF

466

被引次数

9

本文合成了三个以氯冉酸阴离子为桥基的稀土双核配合物,Ln~2(Phen)~4(CA)(NCS)~4(Ln=Nd,Dy,Ho;Phen=菲咯啉;CA=氯冉酸二价阴离子)。通过元素分析,红外光谱,电导,电子吸收光谱及变温(4-300K)磁化率表征了配合物,并由变温磁化率观察到的数据和理论方程通过最小二乘法拟合,得出分子内稀土离子间的相互作用参数:Z'J'=-0.79(Nd),-0.67(Dy),-0.63cm^-^1(Ho);表明稀土离子间存在极弱的反铁磁性交换相互作用。零场分裂参数Δ=-0.16(Nd),-0.76(Dy),-2.55cm^-^1(Ho);g=0.618(Nd),1.739(Dy),1.601(Ho),拟合因子≈10^-^4。

关键词: 磁性, 合成, 双核配合物, 氯冉酸, 稀土, 交换相互作用, 反铁磁性, 红外分光光度法, 元素分析

Three binuclear Nd(III)-Nd(III), Dy(III)-Dy(III) and Ho(III)-Ho(III) complexes containing the dianion of chloranilic acid (CA) as bridging ligand have been synthesized, namely Ln~2(Phen)~4(CA)(NCS)~4 (Ln=Nd, Dy, Ho; Phen=1, 10-phenanthroline; CA=dianion of chloranilic acid). They have been characterized by elemental analyses, IR and electronic spectra, conductance and variable-temperature magnetic susceptibility. The observed susceptibility data were fit to those from theoretical magnetic equation by least-squares method, giving the parameters: Z'J'=-0.79(Nd), -0.67(Dy), -0.63cm^-^1(Ho); It indicates the existence of very weak antiferromagnetic spin exchange interaction between the rare earth ions in the complexes. Δ=-0.16(Nd), -0.76(Dy), -2.55cm^-^1(Ho); g=0.618(Nd), 1.739(Dy), 1.601(Ho); the agreement factor R≈10^-^4.

Key words: MAGNETISM, SYNTHESIS, DINUCLEAR COMPLEX, RARE EARTH, EXCHAHNGE INTERACTIONS, ANTIFERROMAGNETISM, INFRARED SPECTROPHOTOMETRY, ELEMENTAL ANALYSIS

中图分类号: