草酰二胺桥联双核铜（Ⅱ）配合物的磁交换作用

Magnetic Exchange Interaction of μ-Oxamido Copper(Ⅱ)Binuclear Complexes

报道了两个新型配合物［ｃｕ（ｏｘａｅ）Ｃｕ（Ｌ）］（ＣｌＯ４）２［ｏｘａｅ＝Ｎ，Ｎ’－双（２－氨基乙基）草酰胺二阴离子，Ｌ＝２，２’－联吡啶（ｂｐｙ）或４，４’－二甲基－２，２’－联吡啶（Ｍｅ２ｂｐｙ）］的磁性。用变温磁化率对配合物进行了表征，并用最小二乘法和从自旋Ｈａｍｉｌｔｏｎｉａｎ算符，Ｈ＝－２ＪＳ１·Ｓ２，导出的磁方程拟合，求得交换积分为Ｊ＝－２７８ｃｍ－１（ｂｎｙ）和Ｊ＝－２７２ｃｍ－１（Ｍｅ２ｂｐｙ），表明Ｃｕ（Ⅱ）－Ｃｕ（Ⅱ）双核配合物中具有强的反铁磁超交换作用。同时测定了两个配合物的粉末ＥＳＲ谱并进行了讨论。

In this paper,we report the magnetism of two new complexes[Cu(oxae)Cu(L)](CIO4)2[where oxae is N,N’-bis(2-aminoethyl) oxamido dianion,L denotes 2,2’-bipyridyl(bpy)or 4,4’-dimethyl-2,2’-bipyridyl(Me2bpy)]. The complexes have been characterized by variable temperature magnetic susceptibility(75～300K) and the data were fit by leastsquares to a susceptibility equation derived from the spin Hamiltonian,H=-2J·S1·S2, The exchange integral,J,was found to be-278 cm-1(for bpy)and-272 cm-1(for Me2bpy),indicating that a strong antiferromagnetic superexchange interaction opera tes between the metal ions.The powder ESR spectra of the complexes have been obta ined and discussed.