摘要
通过筛选配体、优化合成条件,设计合成了以Tb3+为中心离子,以苯甲酸、水杨酸、对羟基苯甲酸、对甲基苯甲酸、大茴香酸、间氯苯甲酸、对氨基苯甲酸、磺基水杨酸为第一配体,以十一烯酸为第二配体合成8种铽三元荧光配合物。通过红外光谱分析、紫外光谱分析、元素分析、EDTA配位滴定分析以及电导率的测定确定了铽三元荧光配合物的分子结构和组成,采用热分析仪研究了铽三元荧光配合物的热稳定性能,其热稳定性强弱顺序为:Tb(SSA)(UA).3H2O<Tb(BA)2(UA).3H2O<Tb(MCBA)3(UA)2.3H2O<Tb(MBA)2(UA).3H2O<Tb(PHBA)2(UA).3H2O<Tb(PABA)2(UA).3H2O<Tb(SA)2(UA).3H2O<Tb(PMBA)2(UA).3H2O。通过荧光光谱分析,研究了铽三元荧光配合物的发光性能,由发射光谱图可以看出所有铽三元配合物的荧光发射光谱相似,均发出了铽离子的5D4-7F5、5D4-7F6、5D4-7F4(很弱)特征光,荧光表现为绿色。在铽-芳香羧酸-十一烯酸三元配合物中,各配体向铽离子传递光能的能力为:对甲基苯甲酸>磺基水杨酸>大茴香酸>对氨基苯甲酸>苯甲酸>水杨酸>对羟基苯甲酸>间氯苯甲酸,同时对产生上述现象的原因进行了初步的理论探讨。
Through selecting optimum ligand and synthetic conditions, a series of new ternary complexes of terbium with aromatic carboxylic acid as the first ligand and undecenoic acid as the second ligand were synthesized. Their molecular compositions and structures were characterized and confirmed by FT -IR, UV spectroscopy, elemental analysis, EDTA titrimetric analysis and conductance analysis. The thermal stabilities of the terbium ternary complexes were studied by thermal analyzer and their luminescent properties were investigated by fluorescence spectrometer. The results showed that all of the terbium ternary complexes emitted characteristic green fluorescence light. The mechanism for the above phenomenon was discussed.
出处
《分析测试学报》
CAS
CSCD
北大核心
2007年第3期347-351,共5页
Journal of Instrumental Analysis
关键词
稀土
长链配体
荧光配合物
铽
Rare earth
Long-chain ligand Terbium
Fluorescence complex
Terbium
