摘要
合成了四个以草酰胺为桥的新型异三核配合物Ｃｕ２（ｏｘａｅ）２Ｌｎ（ＮＯ３）３，［ｏｘａｅ代表Ｎ，Ｎ’－二（２－氨乙基）草酰胺根阴离子；Ｌｎ为Ｌａ（Ⅲ），Ｃｅ（Ⅲ），Ｎｄ（Ⅲ），Ｇｄ（Ⅲ）］．基于红外光谱、元素分析、溶液摩尔电导测定、紫外可见光谱、磁性测量以及ＥＳＲ谱等表征手段推定这些配合物具有草酰胺桥联结构．测定了Ｃｕ２（ｏｘａｅ）２Ｇｄ（ＮＯ３）３的变温磁化率（４～３００ｋ）．其数值用最小二乘法和由金属离子间磁交换作用的哈密顿算符导出的磁方程理论曲线拟合，求得交换积分Ｊ（Ｃｕ－Ｇｄ）和Ｊ＇（Ｃｕ－Ｃｕ）分别为２．８４ｃｍ（－１）和－０．６８ｃｍ（－１），表明Ｃｕ（Ⅱ）和Ｇｄ（Ⅲ）离子间有弱的铁磁性超交换作用．
Four novel μ-oxamido trinuclear complexes,namely Cu2 (oxae)2Ln(NO3)3(Ln:La,Ce,Nd,Gd),where oxae is N,N'-bis(2-aminoethy1)oxamido dianion, have been synthesized.Based on IR,ESR,elemental analysis;UV-VIS,molar conductance and the measure magnetic property,these complexes were proposed to have oxamido-bridged structure.The variable-temperature magnetic susceptibility of Cu2Gd(oxae)2 (NO3)3 were measured between 4k and 300k.The susceptibility data fitted to the susceptibility equation derived from Hamiltonian H=-2J by least-squares treating.The exchange integrals of J(Gd-Cu)and J'(Cu-Cu)were 2.84cm-1 and-0.68cm-1,respectively.It indicated that there was very weakly ferromagnetic super-exchange interaction between Cu(Ⅱ)ion and Gd(Ⅲ)ion.
出处
《湖北大学学报（自然科学版）》
CAS
1994年第3期280-285,共6页
Journal of Hubei University：Natural Science
关键词
合成
光谱
络合物
磁性
铜
稀土族
Heterotrinuclear complexes
Synthesis
Oxamido-bridge
Ferromagnetic exchange interaction
Variable-temperature magnetic susceptibility
