Study on EPR Spectra of Three Gadolinium Complexes With Noncyclic Polyether Schiff Bases

The EPR spectra of three new gadolinium complexes with noncyclic polyether Schiff bases in powder and those of these complexes in organic solvents were investigated at different temperatures. It was observed that EPR spectra of nine and four peaks of Gd(Ⅲ) complexes in polycrystalline powder and freezing samples appeared at low temperature respectively for the first time. The interpretations of these results obtained on the basis of spin Hamiltonian of s = 7/2 system are satisfactory. The correlations of EPR feature between crystal-field strength in complexes and local symmetry around Gd3+ ions were revealed. The crystal-field parameters b20 and the asymmetry parameters λ' of complexes were estimated. A series of interesting regularity and new results were obtained.     

三种Gd~(3+)直链醚席夫碱配合物的EPR波谱研究

本文考察了三种新的Gd~(3+)直链醚席夫碱配合物在不同温度下的多晶粉末和它们在有机溶剂中的EPR波谱,首次观测到Gd~(3+)配合物多晶粉末谱显现九个特征峰,低温玻璃态显现四个特征峰,藉S=7/2体系的自旋Hamilton作出颇为满意的解释。文中还揭示了EPR图谱特征与配合物中晶体场强度和Gd~(3+)周围局部对称性的关系,估算了配合物的晶体场参数b_2~0不对称参数λ’,得到一系列规律性及新结果。