稀土与β-二酮及2-(2-吡啶)苯并咪唑三元配合物的研究

STUDIES OF RARE EARTH TERNARY COMPLEXES WITH β-DIKETONE AND 2-(2-PYRIDYL) BENZIMIDAZOLE

稀土与β－二酮类的配合物在新型发光材料，免疫试剂等方面已有广泛的研究及应用［１，２］。β－二酮与稀土离子配位后增大了共轭体系，能提高配合物的分子内能量传递量子产率，从而可以得到高效荧光材料，日益受到人们重视。目前对β－二酮类稀土荧光配合物研究得较多的主要有２，２′－联吡啶（ｂｉｐｙ）、邻菲?啉（ｐｈｅｎ）或其氧化产物ｐｈｅｎＯ２、ｐｈｅｎＮＯ 等的三元配合物［３～５］。为了开拓新的荧光体系，一些新型中性协同配体引起了人们的重视［６］。我们首次合成了以２－（２－吡啶）苯并咪唑（Ｈｐｂｉ）为配体的三元稀土β－二酮（苯甲酰丙酮，Ｈｂｚａ、噻吩甲酰三氟丙酮，ＨＴＴＡ）配合物，用元素分析、红外（ＩＲ）、核磁（ＮＭＲ）等手段对配合物进行了表征，并比较了Ｈ２Ｏ、ｂｉｐｙ、Ｈｐｂｉ以及ｐｂｉ－ 负离子对光谱性质的影响。

As useful fluorescent reagent, rare earth complexes with β diketones have been extensively studied. Four new rare earth (La, Eu) ternary complexes with β diketones, (benzoylacetone (Hbza), 2 thenoyltrifluoroacetone, (HTTA)) and organic base (2 (2 pyridyl) benzimidazole, (Hpbi)) have been synthesized and characterized by elemental analysis, IR, NMR. The general formulae of these complexes are [Ln(bza) 3(Hpbi)] and[Ln(TTA) 3(Hpbi)]. The effects of coordinated base on UV, especially on fluorescent properties of the complexes were discussed. The results showed that the dehydro Hpbi, pbi -, strongly enhances the fluorescence of the complexes.