间苯二甲酸根桥联的双锰（Ⅱ）配合物的合成和磁性

SYNTHESIS AND MAGNETISM OF ISOPHTHALATO-BRIDGED MANGANESE(Ⅱ)BINUCLEAR COMPLEXES

本文合成和表征了两种新型的双核锰（Ⅱ）配合物：［Ｍｎ＿２（ＩＰＨＴＡ）（ｂｐｙ）＿４］（ＣｌＯ＿４）＿２（１），［Ｍｎ＿２（ＩＰＨＴＡ）（ｐｈｅｎ）］（ＣｌＯ＿４）＿２（２），（ＩＰＨＴＡ代表间苯二甲酸根阴离子，ｐｈｅｎ和ｂｐｙ分别为１，１０－邻菲咯啉和２，２＇－联吡啶的缩写）．经元素分析、红外光谱、电子光谱、电导、磁性测量等手段推定配合物具有间苯二甲酸根桥联结构，Ｍｎ（Ⅱ）离子处于六配位的八面体环境，测定了配合物（２）的变温磁化率（４－３００Ｋ），其数值与自旋哈密顿算符Ｈ＝－２ＪＳ＿１·Ｓ＿２导出的磁方程拟合，求得交换积分Ｊ为－１０．５４ｃｍ￣（－１），表明双核配合物中金属离子间存在弱的反铁磁性超交换作用。

Two novel manganese(Ⅱ) binuclear complexes have been synthesized andcharacterized,namely [Mn_2(IPHTA)(L)_4](ClO_4)_2(L denotes 2,2'-brpyridyl(bpy);1,10-phenanthroline(phen),respectively),where IPHTA is the isophthalato dianion. Based onIR,elemental analyses, conductivity measurement,electronic spectra and magnetic suscepti-bility,these complexes are proposed to have extended isophthalato-bridged structures and toconsist of two manganese(Ⅱ)ions in which each manganese(Ⅱ)ion has an octahedral en-vironment with six-coordinated.The magnetic susceptibility of [Mn_2 (IPHTA)(phen)_4](ClO_4)_2 were measured over the 4-300 K and the observed data were successfully simulatedby equation based on spin Hamiltonian operator(H=-2JS_1·S_2),giving the exchange inte-gral J=-10. 54cm￣(-1),this indicates a weak antiferromagnetic spin-exchange interaction be-tween the metal ions.