中华医学超声杂志

应用化学 ›› 1996, Vol. 0 ›› Issue (1): 43-46.

• 研究论文 • 上一篇    下一篇

四溴代邻苯二甲酸根桥联的双核钴(Ⅱ)配合物的合成和表征

缪明明, 孙献茹, 石敬民, 廖代正, 姜宗慧, 王耕霖   

  1. 南开大学化学系 天津 300071
  • 收稿日期:1995-04-19 修回日期:1995-08-22 出版日期:1996-02-10 发布日期:1996-02-10
  • 基金资助:
    南京大学配位化学国家重点实验室资助

Synthesis and Magnetism of Tetrabromophthalato-Bridged Cobalt(Ⅱ) Binuclear Complexes

Miao Mingming, Sun Xianru, Shi Jingmin, Liao Daizheng, Jiang Zonghui, Wang Genglin   

  1. Department of Chemistry, Nankai University, Tianjin 300071
  • Received:1995-04-19 Revised:1995-08-22 Published:1996-02-10 Online:1996-02-10

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摘要： 合成和表征了4种以四溴代邻苯二甲酸根阴离子(4Br-PHTH)桥联、以1,10-菲咯啉(phen),5-硝基-1,10-菲咯啉(NO2-phen),2,2′-联吡啶(bpy)和4,4′-二甲基-2,2′-联吡啶(Me2bpy)端接的双核钴(Ⅱ)配合物[Co2(4Br-PHTH)(L)4](ClO4)(L=phen(l),NO2-phen(2),bpy(3),Me2bpy(4)).基于IR光谱、元素分析、电导测量等方法推定配合物具有四溴代邻苯二甲酸根桥联结构和Co(Ⅱ)离子具有畸变的八面体配位环境。进行了配合物变温磁化率(75～300K)的测定,其数据已用从自旋哈密顿符导出的磁方程拟合,求得交换参数J=-0.87cm-1(1),-0.84cm-1(2),-0.82cm-1(3),-0.85cm-1(4),表明金属离子间有弱的反铁磁性自旋交换相互作用。

关键词: 双核化合物, Co(Ⅱ)-Co(Ⅱ), 反铁磁性相互作用

Abstract: Four novel cobalt(Ⅱ) complexes have been synthesized and characterized,namely[Co2(4Br-PHTH)(L)4](ClO4)2(L denotes 1,10-phenanthroline(phen)(1),5-nitro-1,10-phenanthroline(NO2-phen) (2),2,2'-bipyridyl(bpy)(3) and 4,4'-dimethyl-2,2'-bipyridyl(Me2bpy)(4),respectively),where 4Br-PHTH is the tetrabromophthalate anion. Based on IR,elemental analysis and conductivity measurements,these complexes are proposed to have extended tetrabromophthalato-bridged structure consisting of two cobalt ions in which each cobalt(Ⅱ) ion has a distorted octahedral environment.The temperature dependence of the magnetic susceptibility for all the complexes were measured over the range 75～300 K and the observed data were successfully simulated by an equation based on the spin Hamiltonian operator(H=-2JS1·S2),giving the exchange integral J=-0.87 cm-1,J=-0.84cm-1(2),J=-0.82 cm-1(3) and J=-0.85 cm-1(4).These results indicate the existence of weak antiferromagnetic spin exchange interaction between the metal ions.

Key words: binuclear complex, Co(Ⅱ)-Co(Ⅱ), antiferromagnetic interaction

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