铕与苯甲酸、邻菲啰啉系列配合物的合成和光谱分析

Spectral Analysis and Synthesis of a Series of Europium and Benzoic Acid,1,10-Phenanthroline Complexes

合成了铕与苯甲酸(BA)二元配合物及铕与BA、邻菲啰啉(Phen)三元配合物,研究了配合物的红外、紫外吸收光谱及荧光光谱。紫外光谱的研究表明,配合物的紫外吸收主要表现为配体的吸收,配体吸收能量传递给中心离子Eu^(3+)。配合物红外光谱不同于配体的红外光谱,羧基的对称伸缩振动v_(s(COO^-))移至1418cm^(-1),反对称伸缩振动v_(as(COO^-))移至1562cm^(-1),表明稀土与配体之间形成了配位键;测定了配合物及其防伪油墨的荧光性能,铕与苯甲酸、邻菲啰啉形成的三元配合物表现出中心离子Eu^(3+)的特征荧光,616nm荧光发射最强谱峰对应Eu^(3+)的~5D_0→~7F_2跃迁。制备的稀土荧光防伪油墨在可见光下印迹无色,在紫外灯下呈现明显红色荧光。

Binary complex was synthesized with ternary complex was synthesized with ligands of ligands of europium and benzoic acid （BA）, and europium and benzoic acid （BA） and 1, 10- phenanthroline （Phen）. Their infrared absorption spectra, UV absorption and fluorescence spectra were studied. The results showed that UV spectra of the complexes mainly showed as a ligand absorption, energy was absorbed by ligand to transfer to center ion En3＋. The infrared spectra of complexes were different from the ligand, the symmetry telescopic vibration of carboxyl Va（coo^-） to 1418cm^-1,then the against symmetry stretching vibration of carboxyl Vas（coo^-） shifted to 1562cm^-1, that showed coordination bond was formed between europium and the ligand. Determination of fluorescence performance of the complexes and fluorescence security printing ink, ternary complex showed the fluorescence characteristics of centre ion Eu^3＋,the strongest peak of 616nm fluorescence emission spectral corresponded to ^5Do→^7F2 of Eu^3＋. The preparation of the fluorescence security printingink of rare earth is colorless in the visible,hut it showed obvious red fluorescent in UV lamp.