新型四酰胺杯[4]氮杂冠醚的合成及对阴离子的光化学传感性质研究

合成了一类新型四酰胺杯4]氮杂冠醚(5a, 5b), 用紫外和荧光光谱研究了主体与阴离子客体之间的识别性能. 主体分子5a或5b加入到对硝基酚氧阴离子的CHCl₃溶液中, 主客体间形成超分子复合物使得客体阴离子423 nm处吸光度降低且溶液从黄色变为无色. 受体5a, 5b与p-NO₂C₆H₄O^－, F^－, 相互作用, 荧光光谱发生变化, 并且对于p-NO₂C₆H₄O^－具有较好的选择性识别能力, 其荧光光谱强度改变强弱的顺序为p-NO₂C₆H₄O^－＞F^－＞H₂PO₄^－>>Cl^－, Br^－, I^－. 荧光光谱滴定的结果经非线性拟合, 结果表明主客体间形成1∶1络合物.

Synthesis and Anion Recognition Properties of Two Novel Tetraamide Calix[4](aza)crowns for Optical Anion Sensor

Two new tetraamide calix4](aza)crowns (5a, 5b) were synthesized and used for optical anion sensors. Addition of host 5a or 5b to the p-NO₂C₆H₄O^－ anion in CHCl₃ resulted in decreasing absorption of band at 423 nm and the yellow solution of p-NO₂C₆H₄O^－ anion became colorless because of the formation of host-guest complexes between host 5a or 5b and p-NO₂C₆H₄O^－. The fluorescence response was observed in the presence of anions such as p-NO₂C₆H₄O^－, F^－,H₂PO₄^－, and the receptors 5a and 5b were highly selective toward p-NO₂C₆H₄O^－. The degree of change in the emission intensity was in the order of p-NO₂C₆H₄O^－＞F^－＞H₂PO₄^－>>Cl^－, Br^－, I^－. The fluorescence spectroscopy titration experiments indicated the formation of a 1∶1 stoichiometry complex between receptor 5a (or 5b) and anion by nonlinear fitting curve.