【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 .更多还原

【Abstract】 Three new terephthalato-bridged binuclear chromium（Ⅲ） complexes with the formula [Cr₂（TPHA）L₄]（NO₃）₄, where L stands for 4,4’-dimethyl-2,2’-bipyridine（Me₂bpy）; 2,9-dimethyl-1,10-phenanthroline（Me₂phen） 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 4³00 K [Cr₂（TPHA）（Me₂bpy）₄]（NO₃）₄ and the obtained data were simulated by the least square fitting and the equation based on the spin Hamiltonian operator, =-2J₁₂, 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.更多还原