摘要
采用荧光发射光谱法、瞬态荧光光谱法和紫外-可见光谱法考察了七元瓜环(CB7)与2-(2-羟苯基)咪唑并[1,2-a]吡啶(HPIP)的相互作用,结果表明二者发生了相互作用.瞬态荧光光谱结果表明,CB7的加入使荧光寿命下降而量子产率逐渐增加,在1,4-二氧六环溶液中,CB7的加入限制了HPIP的质子转移过程,而在环己烷溶液中则有利于HPIP的激发态质子转移.采用Benesi-Hildebrand方程对所测数据进行了线性拟合,结果表明形成了化学计量比为1∶1的复合物.
Proton transfer exist in a large variety of chemical and biochemical processes as one of the basic reactions of chemical and biochemical systems. Studies on proton transfer of organic molecules in versatile macrocyclic is necessary, and it can provide some reference to the study of the proton transfer process in the biological system. In this work, the interaction of 2-（2′-hyhroxyphenyl）imidazo[1,2-a]pyridine（HPIP） with versatile macrocyclic, namely, cucurbit[7]uril（CB7） and the effect on the excited state intramolecular proton transfer（ESIPT） of HPIP have been investigated by photophysical methods. Fluorescence emission spectrosco-py, transient fluorescence spectra and UV absorption spectroscopy studies illustrate significant interaction be-tween HPIP and CB7. According to the transient fluorescence spectra, due to the formation of HPIP-CB7 com-plex, the lifetime of HPIP was decreased and the quantum yield was increased followed by the increase of the CB7 concentration. Fluorescence emission spectroscopy showed that the ESIPT of HPIP was increased in dioxane and decreased in n-hexane. Furthermore, the absorption data showed that the HPIP molecules and CB7 forming 1 ： 1 complex both in dioxane and n-hexane, and these contentions have been verified by fluores-cence emission data.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第6期1219-1223,共5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)
湖南省高校科技创新团队项目(批准号:湘教通[2012]318)资助~~
