对苯二甲酸根桥联的双核铬(Ⅲ)配合物的合成与磁性  

Synthesis and Magnetic Properties of μ-Terephthalato Binuclear Chromium(Ⅲ) Complexes

作　　者：景志红[1] 李延团[1] 廖代正[2] 

机构地区：[1]曲阜师范大学化学系,曲阜273165 [2]南开大学化学系

出　　处：《应用化学》2001年第2期100-103,共4页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金!(2 96 310 40 );山东省青年自然科学基金! (Q99B12 )资助课题

摘　　要：以对苯二甲酸根 ( TPHA)为桥联配体 ,分别端接 4 ,4 -二甲基 -2 ,2 -联吡啶 ( Me2 bpy) ,2 ,9-二甲基 -1 ,1 0 -邻菲　啉 ( Me2 phen)和 5-氯 -1 ,1 0 -邻菲　啉 ( Cl-phen) ,合成了 3种新的双核铬 ( )配合物 [Cr2 -( TPHA) ( Me2 bpy) 4]( NO3) 4( 1 ) ,[Cr2 ( TPHA) ( Me2 phen) 4]( NO3) 4( 2 )和 [Cr2 ( TPHA) ( Clphen) 4]( NO3) 4( 3) .经元素分析、摩尔电导和磁性测定以及红外光谱和电子光谱等手段 ,推定这些配合物具有 TPHA桥联双核铬( )结构 ,其中 ,每个铬 ( )离子处于畸变八面体配位环境 .测定了配合物 ( 1 )的变温磁化率 ( 4～ 30 0 K) ,其数值用最小二乘法和从自旋 Hamiltonian算符 ( H=-2 JS1 S2 )导出的磁方程拟合 ,求得交换积分为-2 .98cm- 1 ,结果表明双核配合物中金属离子间存在弱的反铁磁自旋交换作用 .Three new terephthalato-bridged binuclear chromium(Ⅲ) complexes with the formula [Cr_2(TPHA)L_4](NO_3)_4, where L stands for 4,4'-dimethyl-2,2'-bipyridine(Me_2bpy); 2,9-dimethyl-1,10-phenanthroline(Me_2phen) and 5-chloro-1,10-phenanthroline(Clphen), repectively and TPHA respresents the terephthalate dianions, have been synthesized and characterized. Based on the elemental analyses, molar conductance and magnetic moments measurements, and spectroscopic studies, extended TPHA-bridged structures consisting of two chromium(Ⅲ) ions, each in an octahedral environment are proposed for these complexes. The variable temperature magnetic susceptibility of was determined at 4~300 K [Cr_2(TPHA)(Me_2bpy)_4](NO_3)_4 and the obtained data were simulated by the least square fitting and the equation based on the spin Hamiltonian operator, =-2J_1_2, where the exchange integral J=-2.98 cm^-1. The result indicates the presence of a weak antiferromagnetic spin-exchange interaction between the metal ions in the binuclear complex.

关 键 词：对苯二甲酸 双核铬(II)配合物 合成 磁性 桥联配体 

分 类 号：O614.611[理学—无机化学]