Abstract EPR spectra of three new quaternary gadoliniumcomplexes(I： [Gd(C6H5COO)2(NO3)(bipy)]2,Ⅱ ： [Gd(m-CH3C6H4COO)2(NO3)(phen)]2 and Ⅲ ： [Gd(p-CH3C6H4COO)(NO3)(phen)]2) with mixed anion ligands in polycrystalline powders and solutions have been investigated at different temperatures and solvents.New behavior of EPR spectra of complex Ⅲ was first observed in polycrystalline powder at 77K and three types of EPR spectra for three complexes,symmetry resonance spectrum for the complex Ⅱ,U spectrum for the complex Ⅲ ,and asymmetry resonance spectrum for the complex I.The relationship of EPR features between the crystal-field strength in the complexes and local symmetry around Gd(Ⅲ ) was discussed.The crystal-field parameters b20 and asymmetry parameters λ′of the complexes I and Ⅲ were estimated.
展开▼
