苯甲酸氯代衍生物稀土配合物的荧光表征

Luminescence Character of Rare Earth Complexes with Derivatives of Benzoic Acid

分别以典型的芳香羧酸苯甲酸及其一氯代衍生物(邻、间、对三种)为第一配体,以邻菲罗啉(phen)或2,2'-联吡啶((bipy)为第二配体,合成了一系列Tb(III)、Eu(III)的配合物.通过红外光谱、紫外可见光谱、荧光光谱等方法探讨了不同位置的取代基或不同的第二配体对配合物荧光性质的影响.结果显示,邻菲罗啉能够增强Eu(III)芳香羧酸配合物的荧光强度而减弱Tb(III)羧酸配合物的荧光强度;2,2'-联吡啶则显示相反的结果.

A series of Eu, Tb complexes were synthesized with derivatives of benzoic acid as the first ligand and phenanthroline or 2, 2-bipyridine as the second ligand. The structural characterization of the complexes was performed using elemental analysis, FT-IR spectroscopy and UV-Vis spectroscopy. The photoluminescent behaviors of the complexes were investigated using fluorescent spectroscopy. The results showed that introduction of the second ligand improved the solubility of the complexes significantly. As far as the photoluminescent behaviors was concerned, phenanthroline enhanced the fluorescent intensity of Eu complexes but weakened the fluorescent intensity of Tb complexes; while the fluorescent intensity of Tb complexes increased and the fluorescent intensity of Eu complexes decreased upon coordinating with 2, 2-bipyridine. In addition, introducing of various substitutions onto the aromatic ring of benzoic acid brought about considerable variation of the fluorescent intensity of the Eu, Tb complexes.