基于荧光光谱研究Cryptophane-A对甲烷及氯仿的识别作用

Study on the Recognition of CH_4 and CHCl_3 by Cryptophane-A Based on Fluorescence Spectra

超分子主体化合物能够有效地包封小分子,从而形成主-客体化合物,这类化合物在分子识别、信息传递以及超分子材料等方面具有强大的的应用潜力。本文用直接法通过正交试验设计合成cryptophane-A,得到最优组合条件是:60℃和甲酸用量为1524:1下反应5h。通过搭建Y型光纤甲烷传感平台,得出cryptophane-A荧光强度在甲烷浓度从0.1%到3.5%范围内呈线性变化,其荧光强度随甲烷浓度增加而减弱,甲烷与cryptophane-A以接近1比1的比例络合,实验搭建的测量装置甲烷检测限为0.1%。其中甲烷浓度为1.5%时,荧光恢复时间是荧光猝灭时间的两倍。另外,cryptophane-A与氯仿可发生较为稳定的络合作用。

The supramolecular host compounds are capable of efficiently encapsulating small molecules to form host - guest eompounds, which have potent application potential in molecular recognition, information transfer, and supramolecular materials. In this paper, cryptophane -A was synthesized by orthogonal design, getting that the optimum conditions were as follows： 60 ~C and the amount of formic acid were 1524 ： 1 for 5 h. The fluorescence intensity of eryptophane - A was linearly while the methane eoncentration changed from 0.1% to 3.5% , and the fluorescence intensity decreased with the increase of methane concentration. The ratio of eryptophane - A complexing with chloroform is close to 1 ： 1, and the limit detection of methane concentration is about 0.1% . When the methane concentration is 1.5% , the fluorescence recovery time is twice as long as the quenching time. Also, cryptophane- A complexes stably with chloroform.