四(二苯甲酰甲烷)合铕酸二乙铵的激发光谱和荧光光谱

Excitation and Luminescence Spectra of Diethylammonium Tetrakis (dibenzoylmethanato) europate

在296和77K测定了四(二苯甲酰甲烷)合铕酸二乙铵[(C_2H_5)_2NH_2Eu(DBM)_4]的高分辨激发光谱和荧光光谱。光谱数据说明在77K,配合物含有五种Eu(Ⅲ)格位,详细分析发光光谱说明。由于配合物中配位体里的苯基错位产生不同的构型,形成了不同的Eu(Ⅲ)物种,显示出不同的晶体场效应,Eu(Ⅲ)离子的这种灵敏性可以作为晶体构型探针。

High-resolution excitation and luminescence spectra were measured at 296 and 77 K. Eu (Ⅲ) ion sites of diethylammonium tetrakis (dibenzoylmethanato) eurote have been probed. The ~5D_o←~7F_o excitation spectrum of the complex displays three maxima at room temperature and splits into five at 77 K. A detailed analysis of the spectra leads to the following conelusion. A series of very similar spectra arise from slightly unequivalent Eu(DBM)_4^- moieties differing in the disorder of phenyl rings, experiencing slightly different erystal field effects. This shows the sonsitivity of the Eu(Ⅲ) ion as conformational probe in the solid state.