基于四甲氧基硫杂杯[4]芳烃荧光熄灭的钴离子光化学传感器

An Optical Chemical Sensor for Cobalt Ion Based on Fluorescence Quenching of 5-Tert-Butyl-2-Methoxy Thiacalix[4] Arene

基于Co2+对固定于聚氯乙烯(PVC)膜中的四甲氧基硫杂杯[4]芳烃具有可逆的荧光猝灭效应,研制了测定Co2+浓度的光化学敏感膜。该敏感膜的最佳化学组成为:50 mg PVC粉、100 mg癸二酸二辛酯和2.5 mg四甲氧基硫杂杯[4]芳烃。在pH=5.6的硝酸溶液中测定Co2+,其线性响应范围为6.31×10-6～1.26×10-2mol/L,检出限为3.11×10-7mol/L。该敏感膜具有较好的重现性、可逆性及选择性,其它常见阴离子和阳离子对其不产生干扰。

An optical chemical sensor was developed for the determination of Co2＋ based on the reversible fluorescence quenching of 5-tert-butyl-2-methoxy thiacalix[4] arene（Tc4A-OCH3） immobilized on a plasticized polyvinyl chloride（PVC） membrane.The optimum membrane of the sensor is composed of 50 mg of PVC,100 mg of dioctyl sebacate（DOS） and 2.5 mg of 5-tert-butyl-2-methoxy thiacalix[4] arene.The maximum response of the membrane for Co2＋ was obtained in nitric acid solution with pH of 5.6,and the proposed sensor responds linearly in a concentration range of 6.31×10-6-1.26×10-2 mol/L,with a detection limit of 3.11×10-7 mol/L.The sensing membrane has the advantages of high reproducibility,reversibility of the fluorescence signal and good selectivity.Common inorganic ions have no interferences.