稀土离子(Sm^(3+))有机配合物的合成及光谱性能的研究  

Synthesis and Spectra Properties of Rare-earth (Sm^(3+)) Organic Complexes

作　　者：孙婷[1] 王耀祥[1] 田维坚[1] 章兴龙[1] 于惠霞[1] 王丽莉[1] 黄昌清[1] 景敏[2] 

机构地区：[1]中国科学院西安光学精密机械研究所信息光子学研究室,西安710068 [2]陕西理工学院仪器科学与技术系,汉中723000

出　　处：《光子学报》2005年第11期1654-1657,共4页Acta Photonica Sinica

基　　金：陕西省自然科学基金(2002F35)资助项目

摘　　要：本文合成了稀土离子(Sm3+)的三种β二酮类二元有机配合物Sm(HFA)3,Sm(TTA)3和Sm(DBM)3.对配体HFA,HTTA和DBM及配合物Sm(HFA)3,Sm(TTA)3和Sm(DBM)3的吸收光谱和荧光光谱进行了测试与分析.发现Sm(HFA)3和Sm(TTA)3在645nm处(对应Sm3+的4G5/2→6H9/2跃迁)有很强的荧光峰,可以观察到明显的红色荧光.并且分析了配合物和配体的能级结构、配体的取代基、配体结构对称性以及CH键含量对配合物光谱性能的影响,证明了HTTA是Sm3+发红色荧光的优良配体.Three rare earth （Sm^3＋） binary chelates with Hexafluoroacetyl acetone （HFA）, thenoyltrifluoroacetylacetone（HTTA） and dibenzoylmethide （DBM） as the ligands were synthesized, respectively. The absorption and fluorescence properties of the ligands and their chelates Sm（TTA）3, Sm （HFA）3, Sm（DBM）3 were investigated. For both Sm（HFA）3 and Sm（TTA）3, there existed a strong fluorescence peak in 645 nm, which ascribed to the transition of ^4G5/2→^6Hg/2 of Sm^3＋. However, the plentiful C-H grouped on the rare earth complex Sm（DBM）3 presumably was quenched the luminescence by nonradiative dissipation of energy which brought from the high energy C-H vibrations, resulting in no peaks over all inspected wavelengths. It was also found the fluorescence intensity of complex Sm（TTA）3 was the topmost, which was firstly attributed to two substituents on the ligand , -CF3 and s. Secondly, among three complexes, the match of Sm^3＋ and HTTA was the best and lead to stronger fluorescence intensity of complex Sm（TTA）3, according to previous research that the degree of energy level match of the ligand and rare-earth（Sm^3＋） affected fluorescence efficiency of complexes. Thirdly, the easier the f-f transition became, the more asymmetry the β-diketone ligand became. In the research, HTTA was an asymmetric ligand, HFA and DBM were symmetric ligands. In conclusion, the fluorescence intensity of Sm（TTA）3 was maximal among Sm（TTA）3, Sm （HFA）3 and Sm（DBM）3 and thus HTTA was a good ligand of Sm^3＋ for red fluorescence.

关 键 词：稀土离子 有机配合物 发光性能 能级匹配 

分 类 号：O657.3[理学—分析化学]