铽与5-氨基间苯二甲酸配合物的合成及发光性能

Synthesis and Luminescent Properties of Complex of Terbium and 5-Aminoisophthalic Acid

稀土有机配合物荧光材料是材料、化学、信息等领域近年来的研究热点。本文在水溶液中合成了铽与5-氨基间苯二甲酸配合物,紫外灯辐照下,配合物能发出明亮的绿光。元素分析表明其组成为TbLCl.H2O(L=C6H3NH2(COO)22-),配合物的紫外吸收主要是配体的吸收,红外吸收光谱表明配合物中铽与羰基氧双齿螯合配位;荧光光谱表明配合物具有良好的荧光性能,激发谱带很宽,最佳激发波长为359nm,与配体的吸收一致,发射光谱为Tb3+离子的特征光谱,发光强度最高的是波长为545.8nm的5D4→7F5跃迁。

In recent years, rare earth complex fluorescence materials have generated much research interests in many fields such as materials science, chemistry and information technology. In this work, the complex of terbium and 5- Aminoisophthalic acid has been synthesized in the aqueous solution, and bright green ray has been seen emitted when excited by UV lamp. The molecular structure of the complex TbLCl·H2O （L = C6H3NH2 （COO）2^2- ） has been identified by elemental analysis. UV absorption spectrum with two wide bands of the complex has been exhibited, which is attributed to ligand＇s absorption. The complex has been chelated through terbium and carbonyl oxygen of the ligand with the bidentate form, which has been confirmed by IR absorption spectra. The photoluminescence （PL） properties of the complex have also been studied at room temperature. When excited at 359nm, the intramolecular energy transfer from the ligand, 5- Aminoisophthalic acid, to Tb^3＋ ions has been observed, which enhanced the characteristic fluorescence intensity of Tb^3＋ ions, A sharp and strong peak at 545.8 nm has been attributed to ^5D4→^7F5 transition.