论文部分内容阅读
[目的]研究三脚架型稀土配合物的组成、配位状态及荧光性质。[方法]通过摩尔电导率、红外光谱、核磁共振波谱、元素分析、差热-热重分析,研究三脚架型配体2,2,2-胺三乙酰-苄胺(L)及其稀土配合物的组成、荧光性质。[结果]2,2,2-胺三乙酰-苄胺的稀土配合物的组成为:Re(NO3)3.L.4H2O(Re=La3+,Sm3+,Y3+,Tb3+,Ce3+,Eu3+),在DMF中为2∶1型电解质,其中的NO3-与金属离子以单齿形式配位。各稀土配合物在248~635℃出现2~3个放热峰,相应于配合物的各级氧化分解过程。Tb(NO3)3.L.4H2O配合物具有Tb3+的特征尖锐线状荧光;在浓度为1×10-4mol/L的甲醇溶液中,配合物的荧光强度最强。[结论]溶剂的极性越大,2,2,2-胺三乙酰-苄胺对Tb3+的敏化作用越强,配合物的荧光强度越强。
[Objective] The research aimed to study the composition, coordination state and fluorescence of tripod-type rare earth complex. [Method] The tripodyl ligand 2,2,2-amine triacetyl-benzylamine (L) and its rare earth complexes were studied by means of molar conductivity, IR, 1HNMR, elemental analysis and DTA- The composition of the fluorescent properties. [Result] The composition of rare earth complex of 2,2,2-amine triacetyl-benzylamine was as follows: Re (NO3) 3.L.4H2O (Re = La3 +, Sm3 +, Y3 +, Tb3 +, Ce3 +, Eu3 + In the 2: 1 type electrolyte, in which NO3- coordinates with the metal ions in monodentate form. The rare earth complexes show 2 ~ 3 exothermic peaks at 248 ~ 635 ℃, corresponding to the oxidation and decomposition process at all levels of the complexes. Tb (NO3) 3.L.4H2O complex has the characteristic sharp linear fluorescence of Tb3 +. The fluorescence intensity of the complex is the strongest in the methanol solution of 1 × 10-4 mol / L. [Conclusion] The greater the polarity of the solvent, the stronger the sensitization effect of 2,2,2-amine triacetyl-benzylamine to Tb3 +, and the stronger the fluorescence intensity of the complex.