多足开链化合物的分子内光诱导电子转移及pH对其荧光的影响

THE INTRAMOLECULAR PHOTOINDUCED ELECTRON TRANSFER OF MULTI PODAL OPEN CHAIN COMPOUNDS AND EFFECT OF pH VALUES ON THEIR FLUORESCENCE

本文合成了含有 1～ 3个萘基取代的脲类柔性开链化合物 .通过对该类化合物在溶液中的光物理行为以及受溶液酸度影响的比较研究 ,发现多足化合物的发光性质强烈地依赖于化合物本身存在的构象形式 ;同时观察到以叔胺为骨架的三足化合物存在分子内光诱导电子转移反应 (PET) ,且这一过程强烈地依赖于介质的pH值 ;而叔胺基的氮原子质子化将会减弱这一PET过程 .

A kind of open chain compounds, containing tri , di or mono naphthylurea substituted amines, were synthesized in this work. It is found that the photophysical behaviors of these compounds in DMF solution strongly depend on the structure and the fluorescence intensity of tripodal compound if affected by the acidity of solution. In the same time, apparent intramolecular photoinduced electron transfer(PET) of the tripodal compound with a tertiary amine group was found, resulting in self quenching of excited state of this compound. Furthermore, this process can be well reduced by protonation of nitrogen of the tertiary amine group of tripodal compound.\;