新型铜离子胶束自组装荧光化学传感器

A New Type of Self-Assembled Fluorescent Chemosensor for Copper Ion in Micelles

基于动态猝灭原理制成了一种新型的"ON—OFF"型铜离子胶束自组装荧光化学传感器,该传感器由十二烷基三甲基溴化铵(DTAB)、硫杂杯[4]芳烃(TCA)、苝三组分在水溶液以胶束自组装形式制成.通过考察TCA用量、表面活性剂DTAB浓度、溶液pH值、Cu2+离子浓度和共存离子等影响因素,系统研究了该荧光化学传感器对水中铜离子的检测性能.结果表明,当TCA与苝的摩尔浓度比达到1 200∶1,表面活性剂DTAB浓度大于600mmol/L,pH大于5时,该荧光化学传感器对水中铜离子具有较好的选择检测性能,且在一定浓度范围内,铜离子浓度与荧光化学传感器的荧光猝灭率呈线性相关.

A new ON--OFF fluorescent chemosensor for Cu2＋ ion was prepared through self-assembly inside Dodecyltrimethylammonium bromide （DTAB） micelles of p-tert-butylthiacalix[4]arene （TCA） and perylene in water solution according to the principle of dynamic quenching. Several effecting factors, such as the quantity of TCA, the concentration of the surfactant DTAB, pH value, the concentration of Cu2＋ ion and co-current metal ions, were investigated for the systematical study on the detecting properties of the fluorescent chemosensor for Cu2＋ ion. The results of the experiments indicated： when[TCA]/[perylene]≥1200/1, DTAB concentration was larger than 600 mmol/L and pH value was above 5 can Cu2＋ ion be detected preferably by the ON--OFF fluorescent chemosensor, and the concentrations of Cu2＋ ions can be almost linearly determined according to the fluorescence quenching in a certain range. The selective detecting capacity of the fluorescent chemosensor for Cu2＋ ion was attributed to the selective complexation of TCA toward Cu2＋ ion.