摘要
合成并表征了５种以２－（４’－氯苯基）－４，４，５，５－四甲基－３－氧化－１－氧自由基咪唑桥联的新型五氟丙酸稀土（Ｎｄ，Ｇｄ，Ｄｙ，Ｈｏ，Ｅｒ）双核配合物，由Ｎｄ（Ⅲ）、Ｄｙ（Ⅲ）、Ｈｏ（Ⅲ）和Ｅｒ（Ⅲ）四种配合物的超灵敏跃迁，讨论了配合物的共价性随稀土离子原子序数增加而减弱的原因，对Ｇｄ（Ⅲ）配合物的变温（４～３００Ｋ）磁化率数据通过用最小二乘法与理论磁化率拟合，得交换积分Ｊ为正值，表明配合物中Ｇｄ（Ⅲ）与自由基间存在弱的铁磁性相互作用．
Five new complexes of binuclear rare earth(Nd, Gd, Dy, Ho, Er)pentafluoropropionate with μ-2-(4'-chlorobenzoyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide were synthesized and characterized. According to hypersensitive transitions of the complexes (Nd(Ⅲ), Dy(), Ho(Ⅲ), Er(Ⅲ)), it was discussed that for the same ligand the covalency decreases as the atomic number of the rare earth metal atom increases, The observed variable-temperature(4～300 K)susceptibility data for Gd(Ⅲ)complex were fitted to those from theoretical magnetic equation by least-square method. The exchange integral, J, was found to be positive, indicating a weak ferromagnetic spin-exchange interaction between the radical and Gd(Ⅲ)ion.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第5期680-683,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
稳定自由基
稀土双核配合物
磁性
Stable radical
Binuclear rare earth complexes
Magnetlsm
