杯[8]芳烃-硝酸稀土配合物的红外光谱及荧光性能  

Infrared Spectra and Luminescent Properties of p-tert-Butylcalix[8]arene-DMF Complexes of Rare Earth Nitrates

作　　者：赵永亮[1] 赵凤英[2] 薛珍[2] 燕来[1] 

机构地区：[1]内蒙古大学化学化工学院,内蒙古呼和浩特010021 [2]内蒙古农业大学基础部,内蒙古呼和浩特010019

出　　处：《发光学报》2006年第3期358-362,共5页Chinese Journal of Luminescence

基　　金：国家自然科学基金(20461002);教育部基金(Z2004-2-15029);内蒙古自然科学基金(200308020104)资助项目

摘　　要：合成了以对叔丁基杯[8]芳烃(LH8)、硝酸根及DMF为配体,单一稀土RE3+(Sm3+、Eu3+、Tb3+、Dy3+)及混合稀土Tb3+∶Ln3+(Ln=La3+,Gd3+,Y3+)为中心的7种稀土配合物,对其进行了元素分析、摩尔电导、热谱、红外光谱及荧光性能研究。荧光光谱的测试表明所有Tb3+及其共掺杂配合物具有较强的特征荧光发射,荧光惰性离子La3+、Gd3+、Y3+对Tb3+的荧光有增强作用,其中Y3+的荧光增强作用最大,Gd3+次之,La3+最小。Seven solid p-tert-butylcalix [8] arene （ LH8 ） -DMF coordination compounds of rare earth （ Sm^3＋ , Eu^3＋, Tb^3＋, Dy^3＋ ） and Tb^3＋ nitrates doped with Ln^3＋ （ La^3＋ , Gd^3＋ , Y^3＋ ） have been synthesized. Their elemental analysis, rare earth complexometric titration, molar conductive, IR spectra, UV spectra and TG-DTA have been studied. The results suggest that the composition of the complexes are [ RE（ LH6 ）（ NO3 ）（ DMF）4 ]3 DMF and [ Ln0. 5 Th0. 5 （ LH6 ） （ NO3 ） （DMF） 4 ] 3 DMF, respectively. In these complexes, the rare earth ions coordinate to the oxygen atoms of p-tert-butylcalix [ 8 ] arene （ LHs ） and DMF, NO3- group coordinate to the rare earth ions as the bidentate form. The fluorescence spectra of the complexes are determined at room temperature. The results suggest that the fluorescence emission intensity data are very different for the complexes, the data of terbium complex is higher, but other complexes are weaker. The fluorescence intensity of terbium complex is determined by the optimum excitation wavelength 322 um （the exbandpass and embandpass are all 3nm）. As seen from Fig. 2, terbium complex and its doped with La3 ~ , Gd3 ~ and Y^3＋ complexes have characteristic luminescence and its fluorescence intensity is enhanced after doping with La^3＋ , Gd^3＋ , Y^3＋. These show that the lowest excitation state energy level of Tb^3＋ ion with the triplet state energy level of the ligands match well each other. The absorbing energy of the hgands are effectively transferred to Tb63＋ ion. The energy transferred process may be （Ln6）2-→[ （Ln6）2- ]＊ →Ln^3＋→[（LH6）2- ]＊ Tb^3＋→^5D4（Tb^3＋ ） （Ln = La, Gd, Y）. The fluorescence intensity of terbium complex is enhanced after doping with La^3＋ , Gd^3＋ , and Y^3＋ ions. The radius of Y^3＋ is the smallest, Gd^3＋ is middle, and La^3＋ is the biggest, so their coordination compounds. The distance is the shortest of Y^3＋ coordination compound with Tb^3�

关 键 词：铽配合物 硝酸稀土 对叔丁基杯[8]芳烃 N N-二甲基甲酰胺 

分 类 号：O482.31[理学—固体物理] O614.33[理学—物理]