杂多元配合物Eu-NTA-POBA-DBSO的分子设计、合成及发光性能研究

为了实现具有特定配位方式的Eu（Ⅲ）杂多元配合物的靶向合成，首先采用稀土硝酸盐与β-萘酰三氟丙酮（NTA）和二苯基亚砜（DBSO）配体反应合成先导化合物，然后利用对甲氧基苯甲酸（POBA）取代先导化合物中的硝酸根实现羧基与稀土离子配位，并通过利用先导化合物中β-萘酰三氟丙酮和二苯基亚砜配体形成的较大空间位阻阻禁羧基桥式配位，实现了羧基双齿螯合配位的靶向合成。运用元素分析、红外光谱、扫描电镜、热重与荧光光谱等手段对相关配合物进行了系统的表征，并根据表征结果推测了它们的化学结构。研究结果表明，双齿螯合型配合物Eu（NTA）2（POBA）（DBSO）2比混合配位型配合物Eu（POBA）（NTA）2（DBSO）2具有更好的分散性能与更高的能量传递效率，并出现主发射峰劈裂弱，发射峰半高宽变锐的特征；而混合配位型配合物Eu（POBA）（NTA）2（DBSO）2比双齿螯合型配合物Eu（NTA）2（POBA）（DBSO）2具有稍好的热稳定性。得到了2种鲜艳红色的高效荧光材料。

Research on Molecular Design and Synthesis of Cross Multiligand Complexes of Eu-NTA-POBA-DBSO and Its Luminescent Properties

In order to achieve the target synthesis of Eu（Ⅲ） cross multiligand complexes with the designated coordination mode, the precursor compound was prepared by synthesis of rare earth nitrates, β-naphacyltfifluoroacetonate （NTA） and diphenyl sulfoxide （DBSO） ligands, then the coordination of carboxyl group with Eu（III） ions was achieved by replacing the NO3- in precursor compound with β-methoxybenzoic acid （POBA）. Owing to the larger steric resistance coordination from the ligands of β-naphacyltrifluoroacetonate and diphenyl sulfoxide in precursor compound, the target synthesis of the bidentate chelating coordination of carboxylate groups with Eu（Ⅲ） ions was achieved. The complexes related were characterized by elemental analysis, infrared spectroscopy, scanning electron microscopy, fluorescence spectroscopy, and thermogravimetry, furthermore based on the characterization results speculated the chemical structures. The results showed that bidentate chelate complex Eu（NTA）2（POBA）（DBSO）2 had better dispersion properties and higher efficiency of energy transfer than mixed coordination complex Eu（POBA）（NTA）2（DBSO）2, the main emission band of bidentate chelate complex becomed sharper and the split peak of the main emission was weaker than that of mixed coordination complex, and mixed coordination complex Eu（POBA）（NTA）2（DBSO）2 had slightly better thermal stability than that of bidentate chelating complex Eu（NTA）2（POBA）（DBSO）2. Two bright red fluorescent material were obtained.