含三联吡啶聚苯乙烯荧光微球的制备与性能

Synthesis and Fluorescence of Terpyridine-Functionalized Polystyrene Microsphere-Based Lanthanide Luminescent Chemosensor

将三联吡啶基团引入交联的聚苯乙烯树脂(Merrifield树脂)表面后在甲醇中与硝酸铕进行配位反应,制备了新型荧光微球。利用红外光谱、元素分析、光电子能谱和荧光光谱等分析手段对聚合物和铕配合物进行了表征,研究了其对有机磷酸酯的荧光传感性能。结果表明,该微球及其在非水溶剂的悬浮液在手持式紫外灯照射下均发射出铕离子的特征红色荧光,氯磷酸二乙酯可以迅速、有效地猝灭其荧光。其在617 nm处的荧光猝灭常数为0.308×103 L/mol,这种微球有望在有机磷农药检测用的荧光传感器中得到应用。

2,2′：6′,2″-Terpyridines bound to polystyrene microsphere support allows the complexation of lanthanide metal ions Eu（III）. Novel terpyridine-functionalized polymeric resins were synthesized through the nucleophilic substitution reaction between hydroxyl-functionalized terpyridine and Merrifield resin, leading to the chelating fluorescent microbead material. The microspheres were characterized by FT-IR spectroscopy, elemental analysis, XPS measurements and fluorescence spectroscopy. Characteristic red emission under irradiation of 365 nm light from a hand-held UV lamp was observed for the Eu（III） ion-loaded spheres either in a solution or solid-state. The strong fluorescence emission of Eu（III） ion-loaded spheres could be instantaneously quenched when exposed to diethyl chlorophosphate. The Stern-Volmer constant （Ksv ） value for quenching at 617 nm is measured to be as high as 0.308×103 L/mol, which could pave a new way for developing sensitive organophosphate pesticide sensing materials.