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（ＮＯ_２－ｐｈｅｎ），２，２′－联吡啶（ｂｐｙ）和４，４′－二甲基－２，２′－联吡啶（Ｍｅ_２ｂｐｙ）端接的双核钴（Ⅱ）配合物［Ｃｏ_２（４Ｂｒ－ＰＨＴＨ）（Ｌ）_４］（ＣｌＯ_４）（Ｌ＝ｐｈｅｎ（ｌ），ＮＯ_２－ｐｈｅｎ（２），ｂｐｙ（３），Ｍｅ_２ｂｐｙ（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。
Four novel cobalt(Ⅱ) complexes have been synthesized and characterized,namely[Co_2(4Br-PHTH)(L)_4](ClO_4)_2(L denotes 1,10-phenanthroline(phen)(1),5-nitro-1,10-phenanthroline(NO_2-phen) (2),2,2'-bipyridyl(bpy)(3) and 4,4'-dimethyl-2,2'-bipyridyl(Me_2bpy)(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=-2JS_1·S_2),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.
出处
《应用化学》
CAS
CSCD
北大核心
1996年第1期43-46,共4页
Chinese Journal of Applied Chemistry
基金
南京大学配位化学国家重点实验室资助
关键词
配合物
磁化率
邻苯二甲酸根
溴代
钴
binuclear complex,Co(Ⅱ)-Co(Ⅱ),antiferromagnetic interaction
