荧光法研究羟基葫芦[6]脲与铽离子(Ⅲ)的分子识别作用  

Study on the Inclusion Interaction of Perhydroxycucurbit[6] uril with Tb(III) by Fluorimetric Method

作　　者：葛小辉[1] 李来生[1] 黄志兵[1] 李艳平[1] 

机构地区：[1]南昌大学分析测试中心,江西南昌330047

出　　处：《南昌大学学报（理科版）》2006年第3期248-253,共6页Journal of Nanchang University(Natural Science)

基　　金：江西省教委基金资助项目(JJ2006-07);江西省自然科学基金资助项目(9920024)

摘　　要：采用荧光光谱法首次研究羟基葫芦[6]脲(HOCB6)与铽离子(Ⅲ)之间的包结络合作用。实验发现主客体之间通过离子-偶极和配位等多种超分子作用形成1:1型的HOCB6-Tb3+络合物,测得其络合常数为5.40×104Lmol-1。考察了酸的浓度对该络合物的形成及荧光强度的影响。同时采用葫芦[6]脲(CB6)、β-环糊精和对-二甲氨甲基杯[8]芳烃进行比较研究,发现Tb3+与β-环糊精无作用,而能与葫芦[6]脲和杯[8]胺形成1:1型的络合物,络合常数分别为5.84×102Lmol-1和1.87×104Lmol-1,其原因可能与主体分子的腔体大小和配位能力有关。The inclusion interaction of perhydroxycucurbit [ 6 ] uril （HOCB6） with Tb （Ⅲ） by fluorimetric methods. The results indicate that the ion - dipole and complex interactions resulted in the formation of 1 ： 1 type inclusion complex HOCB6 - Tb（Ⅲ）. The complex constant was determined to be 5.40 × 10^4 Lmol^-1. The effect of the acid concentration on the fluorescent intensity and the stability of the complex were investigated. The comparative study of Tb （Ⅲ） with other supramolecules, such as cucurbit [ 6 ] uril, β - cyclodextrin and p - （ N, N - dimethylamino - methyl） -calix [ 8 ] arene, was also carried out. The spectra changes show that cucurbit [ 6 ] uril and p - （N, N -dim- ethyl - aminomethyl） - calix [ 8 ] arene with Tb （Ⅲ） can also form stable 1 ： 1 type complexes, instead of β - cyclo- dextrin. The complex constants of cucurbit [ 6 ] uril and p - （ N, N - dimethyl - aminomethyl） - calix [ 8 ] arene with Tb （Ⅲ） were 5.84 × 10^2 Lmol^- 1 and 1.87 × 10^4 Lmol^-1 respectively,which were related to the sizes of cavities and the inclusion abilities of host supramolecules.

关 键 词：荧光光谱法 分子识别 络合作用 羟基葫芦[6]脲 铽(Ⅲ) 

分 类 号：O657.3[理学—分析化学]