摘要
作者合成和表征了 3个通式为 [Co2 (PMTA)L4 ]的新双核钴 (II)配合物 ,其中 ,PMTA代表均苯四甲酸根四价阴离子 ,L分别为邻苯二胺 (obda)、2 二甲氨基乙胺 (Me2 en)和 3 二甲氨基丙胺 (Me2 pn) .根据元素分析、摩尔电导测定、红外和电子光谱等手段 ,已推定这些配合物具有均苯四甲酸根桥联的双核钴 (II)结构 ,其中 ,两个钴 (II)离子均处于畸变的八面体配位环境 .作者还测定并解析了配合物 [Co2 (PMTA) (Me2 pn) 4]的变温 (4～ 30 0K)磁化率 ,求得交换积分J =- 0 .2 8cm-1.根据实验结果作者认为 ,在双核钴 (II)配合物中的钴 (II)
Three new (μ-tetracarboxylato binuclear cobalt(II) complexes described by the overall formula [Co 2(PMTA)(L) 4], where PMTA represents the tetraanion of pyromellitic acid; and L denotes o-benzenediamine (obda), 2-dimethylaminoethylamine (Me2en) or 3- dimethylaminopropylamine (Me 2pn), respectively, have been synthesized and characterized by elemental analyses, molar conductivity measurements, IR and electronic spectra. It is proposed that these complexes have PMTA-bridged structures and consist of two cobalt(II) ions, each in a distorted octahedral environment. The [Co 2(PMTA)(Me 2pn) 4] complex was further characterized by variable temperature magnetic susceptibility measurements (4～300 K) and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, =2J 1· 2, giving the exchange integral J = -0.28 cm -1. The result revealed the operation of antiferromagnetic spin-exchange interaction between the two Co(II) ions within the molecule.
出处
《四川大学学报（自然科学版）》
CAS
CSCD
北大核心
2001年第6期856-862,共7页
Journal of Sichuan University(Natural Science Edition)
基金
TheNationalNaturalScienceFoundationofChina(2 98730 31)
关键词
μ-均苯甲酸根
双核钴(Ⅱ)配合物
合成
磁性
桥联配体
tetracarboxylato
binuclear cobalt(II) complex, magnetic property
synthesis
characterization
