摘要
合成了一个氰根桥联 Gd(Ⅲ)离子Fe离子的三维网状配合物GdFe(CN)_6·4H_2O.使用元素分析、红外光谱对配合物进行了一般性表征.用X射线衍射法测定了配合物的单晶结构,属单斜晶系,空间群为C_2.晶胞参数为:a=1.2759(6),b=0.7404(1),c=1.3654(5)nm,β=90.22(3)°,Z=4,对该配合物进行了变温磁化率测定(4.2～300K).并使用哈密顿算符(H=-2JS_1S_2,S_1=1/2,S_2=7/2)对所测数据进行了理论分析,求得表征CN^-离子所桥联Gdt(Ⅲ)离子与Fe(Ⅲ)离子间磁相互作用强弱的磁交换积分J=-69.1cm^(-1)表明Gd(Ⅲ)离子与Fe(Ⅲ)离子间存在有中等强度的反铁磁相互作用.该相互作用是目前已见文献报道的桥联稀土离子和过渡金属离子间所发现的最大的磁相互作用.
The complex GdFe(CN)6 ?4H2O was synthesized and characterized by elemental analysis and infrared spectrum. The crystal structure of the title complex was determined by X -ray diffraction analysis. It crystallizes in the monoclinic system,space group C2,with a = 1.2759(6), b = 0. 7404(1), c = 1. 3654(5)nm, Z = 4 and β = 90. 22(3)°. The variable - temperature magnetic susceptibility of the complex was measured over 4.2-300 K. The magnetic analysis was performed by using the Hamiltonian operator (H=-2JS1S2, S1 = 1/2, s2=7/2),giving the antiferromagnetic coupling parameter of J = -69. 1cm-1. This result indicates that there exists a mediate antiferromagnetic spin - exchange interaction between Gd(III) ion and Fe(III) ion that are bridged by the cyanide ion. According to our best knowledge, the magnetic interaction is the strongest interaction between Gd(III) ion and transition metal ion that was found so far.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1997年第5期467-473,共7页
Acta Chimica Sinica
基金
国家自然科学基金
国家教委博士点基金资助项目
