硫杂杯芳烃基胶束自组装荧光化学传感器制备及其性能研究

The Preparation and Properties Study of Micellar Thiacalixarenes Self-Assembled Fluorescent Chemosensor

以对叔丁基硫杂杯[4]芳烃(TCA)为受体、苝和十二烷基苯磺酸钠(SDBS)分别为荧光体和自组装模板剂,通过在水中的胶束自组装作用制备得到一种新型的"ON–OFF"型Cu^(2+)荧光化学传感器。论文选用荧光猝灭率为考察指标,详细考察了受体TCA用量、自组装模板剂SDBS浓度、Cu^(2+)浓度和共存金属离子等影响因素对胶束自组装荧光化学传感器Cu^(2+)检测性能的影响情况。实验结果表明,当受体TCA与荧光体苝的摩尔浓度比值达到1 000,自组装模板剂SDBS浓度为50mmol·L^(-1),该荧光化学传感器对水中铜离子具有较好的检测能力,待测Cu^(2+)浓度在一定浓度范围内与荧光猝灭率呈线性相关。此外,荧光化学传感器的Cu^(2+)检测性能基本不受Pb^(2+),Cd^(2+),Mn^(2+),Na^+,K^+,Ca^(2+),Mg^(2+),Al ^(3+),Ni ^(2+),Zn^(2^+)等共存金属离子干扰。该胶束自组装荧光化学传感器对Cu^(2+)的选择性检测性能主要归因于胶束表面活性剂分子层中TCA受体对Cu^(2+)的识别作用,而传感器荧光猝灭主要基于胶束内部的电荷转移或能量转移机制。

A novel ON-OFF micelle-based fluorescent chemosensor for Cu^（2＋）ions was prepared through the micellar self-assembling in water solutions with p-tert-butylthiacalix[4]arene（TCA）as receptor,perylene as fluorophore and Sodium dodecylbenzenesulphonate（SDBS）as self-assembling template.Several effecting factors,such as the quantities of the receptor TCA,the concentrations of the self-assembling template SDBS,the concentrations of the Cu^（2＋）ions and the co-current metal ions,were investigated for the systematical investigation on the detecting capabilities of the micelle-based fluorescent chemosensor for Cu^（2＋）ions through measuring the quenching of the fluorescent emission of the fluorophore.As the results indicated,when the molar concentration ratio value of the receptor TCA to the fluorophore was equal to 1 000 and the concentrations of the self-assembling template SDBS reached 50mmol·L^（-1）,the Cu^（2＋）ions could be detected preferably by the prepared micelle-based fluorescent chemosensor.The concentrations of the Cu^（2＋）ions could be almost linearly measured according to the quenching ratios of the fluorescent emission in a certain range of concentration.Furthermore,the detecting capabilities of the micelle-based fluorescent chemosensor for the Cu^（2＋）ions were almost not influenced by the co-existing metal ions such as Pb^（2＋）,Cd^（2＋）,Mn^（2＋）,Na~＋,K~＋,Ca^（2＋）,Mg^（2＋）,Al ^（3＋）,Ni ^（2＋）and Zn^（2＋）ions.The selective detecting capabilities of the obtained micelle-based fluorescent chemosensor for the Cu^（2＋）ions could be mainly attributed to the recognition of the receptor TCA in the surfactant micelle with the Cu^（2＋）ions,and the quenching of the fluorescent emission of the fluorophore was estimated to be based on an intramicellar electron-transfer or energy-transfer mechanism.