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作 者:缪明明[1] 孙献茹[1] 石敬民[1] 廖代正[1] 姜宗慧[1] 王耕霖[1]
机构地区:[1]南开大学化学系
出 处:《应用化学》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
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.
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