Eu(Ⅲ)-β-NPA-HTTA二元、三元配合物的合成和光谱研究

Synthesis and Spectra of Binary and Ternary Complexes of Eu(Ⅲ) with β-Naphthoic Acid and 2-Thenoyltrifluoroacetone

为了获得高光效、高稳定性能的发光材料,探讨β-萘甲酸（β-NPA）化合物在发光材料方面的应用,合成了Eu（Ⅲ）与β-NPA及2-噻吩甲酰三氟丙酮（HTTA）形成的二元、三元荧光配合物。对所合成的配合物利用元素分析、紫外可见光谱、红外光谱、荧光光谱等手段进行了表征。对稀土配合物的结构与发光性能之间的关系进行了探讨。表征结构表明,两个配合物的组成分别为Eu（β-NPA）3·3H2O和Eu（β-NPA）（TTA）2·2H2O;紫外光谱研究表明,β-NPA与铕离子配位后整个体系的共轭程度增大,使得配合物的紫外吸收能力增强;荧光光谱研究显示,与铕离子反应后的配合物的配体β-NPA、2-HTTA能将吸收的能量有效地传递给铕离子,从而使配合物发射出强的铕离子的特征荧光,且两个配合物Eu（β-NPA）3·3H2O,Eu（β-NPA）（TTA）2·2H2O均以-5D0→-7F2跃迁的荧光发射最强。得到了两种高效的红色荧光配合物Eu（β-NPA）3·3H2O,Eu（β-NPA）（TTA）2·2H2O,它们可望成为制备鲜艳红色发光材料的侯选。

In order to achieve the high luminescent efficiency and high stability luminescent material and investigate the application of β-naphthoic acid （β-NPA） in luminescent material, Eu（ III ） binary and ternary complexes of β-naphthoic acid （β-NPA） with 2-thenoyhrifluoroacetone （2-HTFA） were synthesized. These complexes were characterized by elemental analysis, ultraviolet （UV） spectroscopy, infrared （IR） spectroscopy and fluorescent spectra. The relationships between structure and luminescent properties of complexes were discussed. The compositions of the complexes were confirmed to be Eu （β-NPA） 3·3 H2O and Eu （β-NPA） （TTA）2·2 H2O. UV studies showed that the conjugation of the entire system increased after europium ions were coordinated with β-NPA, and the UV absorption capacity of the complexes became stronger. Fluorescence spectroscopy studies showed that both complexes exhibited characteristic emission of europium ions, which indicated that the energy absorbed by the β-naphthoic acid and 2-thenoyhrifluoroacetone （TFA） which have coordinated with europium ions could be effectively transferred to europium ion, moreover, the fluorescent intensity of ^5 D0→^7 F2 of Eu （β-NPA） 3·3 H2O and the Eu （ β-NPA ） （ TTA ） 2·2 H2O was the highest. Two high-efficiency red fluorescent complexes Eu （ β-NPA ） 3·3 H2O, Eu （β-NPA） （TTA） 2·2 H2O were obtained. The new complexes were a promising candidate as a bright red luminescent material.