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

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.     

多足开链化合物与阴离子的相互作用

设计合成了６种萘取代的脲及硫脲类多足开链化合物，利用吸收光谱、荧光光谱及_１Ｈ ＮＭＲ波谱手段详细研究了该类化合物作为主体分子与不同种类的阴离子客体分子间的相互作用．实验表明，客体阴离子Ｈ_２ＰＯ_４~－及ＨＳＯ_４~－可以与三足的脲及硫脲主体分子形成主客体配合物从而诱导主体分子光物理性质发生变化，而且表现出较好的选择性．测定了主客体配合物的稳定常数和化学配位比，对三足脲和硫脲与阴离子客体的选择性和识别作用进行了比较，提出了相应主客体配合物可能的配位方式和结构形式．     

Interaction of multi-podal open-chained compounds with anions

Six kinds of naphthyl urea and thiourea podands were designed and synthesized. The interaction between these compounds and various guest anions are studied in molecular level via absorption, fluorescence and 1H NMR spectra. The experiments show that tri-podal urea or thiourea host can bind H2PO4-or HSO4-selectively and form a host-guest complex thus inducing a change in photophysical properties of host molecule. Through comparison between urea and thiourea compounds used as host molecules, the stability constants and stoichiometry of the complexes have been determined. The binding manner and possible structures of them have been proposed.