摘要
利用荧光发射光谱、紫外吸收光谱和核磁共振氢谱(1H NMR)研究了八元瓜环(CB8)与2-(2-氨基-3-吡啶基)苯并咪唑(2-A3PyBI)的超分子相互作用及其对2-A3PyBI分子内质子转移过程的影响.结果表明,在水溶液中2-A3PyBI具有双重荧光发射峰,分别对应其2种质子转移异构体.固定pH值下的荧光滴定实验表明主客体包合比为1∶2,2-A3PyBI进入CB8空腔后促进了其分子内激发态质子转移过程.同时,1HNMR结果表明2-A3PyBI的苯环部分进入了CB8空腔.
The inclusion interaction of 2-（2-amino-3-pyridyl） -benzimidazole （2-A3PyBI） with cucurbit [ 8 ] uril（CB8） and the effect of the interaction on the proton transfer of 2-A3PyBI were studied via fluorescence emission spectroscopy, UV absorption spectroscopy and 1H NMR. The results show that 2-A3PyBI has a dual emission fluorescence which corresponds to its proton transfer tautomers. The fluorescence titration results at selected pH value indicate that the interaction ratio is 1：2 and the encapsulation of 2-A3PyBI into CB8 cavity enhances the excited-state intramolecular proton transfer process. The 1H NMR titration results, which the benzene ring signal upward but no obviously change of the pyridine ring was observed in DCI/D20, indicate that the benzene ring of 2-A3PyBI entrapped into the CB8 cavity with the ovridine rin outside the cavity.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第12期2657-2662,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21172066
20971041)
湖南省自然科学基金(批准号:11JJ2007)
湖南省高校创新平台开放基金(批准号:09K081)资助
作者简介
联系人简介：易平贵，男，博士，教授，博士生导师，主要从事分子构效与理论计算研究．E-mail：pgyi@hnust．cn
