铕-香豆素-3-羧酸配合物的合成、表征及其荧光性质研究

Synthesis,characterization and fluorescence performance of Eu^(3+) complexes with coumarin-3-carboxylic acid

以香豆素-3-羧酸为配体,在超声波辅助下,合成了两个铕-香豆素-3-羧酸配合物EuL3NO3和EuL2Cl2(L=香豆素-3-羧酸根阴离子),通过IR、1HNMR、13CNMR、MS和元素分析等表征手段,对配合物的结构和组成进行了表征,并对其荧光光谱性质进行了研究。结果表明,配体的羧酸、羰基基团均与铕离子配位;配合物EuL3NO3的荧光明显强于EuL2Cl2。

Two binary Eu^3＋ complexes with coumarin-3-formic acid EuL3NO3 and EuL2Cl2 （L = coumarin-3-carboxylic anion）, were synthesized and confirmed by IR, ^1HNMR, ^13CNMR, MS and elemental analysis. The results indicated that coumarin-3-carboxylic anion was bonded with Eu （ Ⅲ） through oxygen atoms in carboxyl and carbonyl groups. The fluorescence spectra showed that the fluorescence emission intensity of EuL3NO3 was stronger than that of EuL2Cl2.