摘要
利用二氧六环(dioxane)小分子作为第二配体,吡哌酸(PPA)作为第一配体合成了稀土荧光配合物Eu(PPA)3dioxane和Tb(PPA)3dioxane。这种小分子直接参与配位形成稀土配合物的现象很少见到。所合成的配合物通过与单独使用吡哌酸作为配体的配合物Eu(PPA)3和Tb(PPA)3对比,发现二氧六环对稀土配合物的荧光具有明显的增强效果,尤其是对Tb3+所形成的稀土配合物,荧光增强非常显著。二氧六环的参与配位,代替了原来的水分子,这样就会在一定程度上减少了热振动所造成的能量损失,从而增强荧光。所制备的稀土配合物通过红外光谱、荧光光谱、荧光寿命等方法进行了表征。对于由Eu和Tb所形成的配合物,加入第二配体二氧六环对其荧光寿命的影响差别很大,这说明对于Eu和Tb所形成的配合物存在着不同的能量传递过程。这种荧光增强现象为检测小分子二氧六环的存在及其含量提供了一种新的方法。
Eu（PPA）3dioxane and Tb（PPA）3dioxane were synthesized by firstly adopting dioxane as second ligand and using pipemidic acid（PPA） as first ligand.In contrast with two kinds of binary lanthanide complexes Eu（PPA）3 and Tb（PPA）3,the photoluminescent intensities of Eu（PPA）3dioxane and Tb（PPA）3dioxane are much stronger,especially for that of Tb（PPA）3dioxane.The enhancement of photoluminescent intensities of Eu（PPA）3dioxane and Tb（PPA）3dioxane is because of the replacement of dioxane for water bonded to Eu3＋ and Tb3＋,by which the energy loss through heat oscillation will be inhibited.The as-synthesized lanthanide complexes were characterized by FT-IR,photoluminescence spectra and photoluminescence lifetime.The lifetime of Eu（PPA）3dioxane and Tb（PPA）3dioxane remarkably changed compared with those of Eu（PPA）3 and Tb（PPA）3.However,there is much difference for the lifetime change of as-synthesized lanthanide complexes formed by Eu3＋ and Tb3＋,which shows that there is different energy transfer process for the lanthanide complexes formed by Eu3＋ and Tb3＋.The synthesis of lanthanide complexes using dioxane as second ligand will provide a new method to detect the existence of dioxane.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2011年第3期727-731,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(50973003)
安徽省科技计划项目(090518026)
安徽高校省级自然科学研究重点项目(KJ2010A254)
阜阳师范学院自然科学基金项目(2010FSKJ01ZD
2008LQ13
2008LQ14)资助
关键词
二氧六环
吡哌酸
稀土配合物
荧光
寿命
Dioxane
Pipemidic acid
Lanthanide complex
Photoluminescence
Lifetime
