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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。
The binary complexes of europium with benzoic acid (BA) and ternary complexes of europium with phenanthroline (Phen) were synthesized. The infrared and ultraviolet absorption spectra and fluorescence spectra of the complexes were studied. UV spectroscopy studies show that the UV absorption of the complex is mainly reflected by the ligand absorption, and the energy absorbed by the ligand is transferred to the Eu (3+) ion. The IR spectrum of the complex differs from that of the ligand in that the symmetric stretching vibration of the carboxyl group v_ (s (COO ~ -)) shifts to 1418 cm -1 and the v_ (as (COO ~ -)) 1562cm ~ (-1), indicating that the rare earth and the ligand formed between the coordination bond; measured the fluorescence properties of the complex and its anti-counterfeit inks, europium and benzoic acid, phenanthroline formation of the ternary complex center The characteristic fluorescence of Eu ~ (3+) ion and the strongest emission peak at 616nm correspond to ~ 5D_0 → ~ 7F_2 transition of Eu ~ (3+). The rare-earth fluorescent anti-counterfeit ink prepared under visible light imprinted colorless, showing obvious red fluorescence under UV light.