含Fe(Ⅲ)和Cu(Ⅱ)离子异三核配合物[Cu_2(oxae)_2Fe(H_2O)_2](ClO_4)_3的磁化率和ESR谱的研究

Magnetic Susceptibility and ESR Investigations of Heterotrinuclear Complex Containing Iron(Ⅲ)and Copper(Ⅱ)Ions: [Cu2(oxae)2Fe(H2O)2](ClO4)3

合成了一种新型异三核配合物［Ｃｕ２（ｏｘａｅ）２Ｆｅ（Ｈ２Ｏ）２］（ＣｌＯ４）３，这里ｏｘａｅ是Ｎ，Ｎ’双（２氨基乙基）草酰胺二价阴离子。基于红外光谱、元素分析、电导的测量和电子光谱，推定了配合物具有扩展草酰胺桥联结构。研究了配合物的变温磁化率（１５～３００Ｋ），并用最小二乘法和从自旋Ｈａｍｉｌｔｏｎ算符，＾Ｈ＝－２Ｊ（＾Ｓ１·＾Ｓ２＋＾Ｓ２·＾Ｓ３）－２Ｊ′＾Ｓ１·＾Ｓ３，导出的磁方程拟合，求得交换积分Ｊ＝－６９．１ｃｍ－１，结果表明，配合物Ｆｅ（Ⅲ）和Ｃｕ（Ⅱ）离子间存在反铁磁自旋交换作用。同时测定了配合物室温下粉末ＥＳＲ谱并进行了讨论。

Novel heterotrinuclear complex [Cu2(oxae)2Fe(H2O)2](ClO4)3 has been synthesized, where oxae is N,N'bis(2aminoethyl)oxamide dianion. Based on IR, elemental analyses, conductivity measurement and electronic spectra, the complex is proposed to have extended oxamidobridged structure. Variabletemperature magnetic susceptibility of the complex has been studied in the 1.5300K range and the observed date is fit by leastsquares to a susceptibility equation derived from the spin Hamilton operator,=-2J(1·2+2·3)-2J′1·3. The exchange intergral, J, has been found equal to -69.1 cm-1. This procedure indicates the existence of an antiferromagnetic spinexchange interaction between the Fe(Ⅲ) and Cu(Ⅱ) ions. The powder ESR spectrum of the complex has been obtained and discussed.