1种Tb(Ⅲ)配合物的合成、结构及发光性能

Synthesis,structure and luminescent property of Tb(Ⅲ) coordination complex

采用水热合成方法,以氨三乙酸为配体,合成了1种Tb(Ⅲ)的配位聚合物{[TbN(CH2CO2)3(H2O)2].H2O}n,通过单晶X射线衍射确定了该配合物的晶体结构.该配合物属正交晶系,Pbca空间群,晶胞参数为a=0.809 38(7)nm,b=1.298 43(11)nm,c=2.061 70(18)nm,V=2.166 7(3)nm3,R1=0.025 8,wR2=0.055 8.配合物的不对称单元为[TbN(CH2CO2)3(H2O)2].H2O,其中Tb(Ⅲ)离子为8配位.在晶体中,Tb(Ⅲ)离子之间通过氨三乙酸根的氮原子和羧基氧原子连接,最终在ab面上形成2D层状结构.在室温下,测定了该配合物晶体粉末的激发光谱、发射光谱、IR和UV-Vis,并对其进行了分析指认.发射光谱研究表明,该配合物固态粉末在室温紫外光的照射下可发射较强的绿光,并表现出较强的Tb(Ⅲ)的特征发射.

One Tb （ Ⅲ ） coordination complex with the ligand nitrilotriacetic acid, {[TbN（CH2CO2）3（H2O）2]·H2O}n has been synthesized by the hydrothermal method. The structure of the complex has been determined by single crystal X ray diffraction. The complex crystallizes in the orthorhom- bic, space group Pbca with a=0. 80938（7） nm, b=l. 29843（11） nm, c=2. 061 70（18） nm, V= 2. 1667（3） nm3, the final R1 =0. 025 8 and wR2 =0. 055 8. The asymmetric unit of the complex is [TbN（CH2CO2）3（H2O）2]·H2O and Tb（Ⅲ ） ion is eight-coordinated. In the crystal, Tb（ Ⅲ） ions is connected by the nitrogen atom and the carboxylic oxygen atoms of amino tri-acetates, forming the 2D layer in ab plane. At room temperature in the solid state, the excitation, emission, IR and UV- Vis spectra of the complex were measured and analyzed. The emission spectrum of the complex shows strong characteristic emissions of Tb（Ⅲ） ion under UV excitation and can emit strong green light at room temperature.