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以2,4-二氯苯硫酚为单体,通过“一步法”合成了平均分子量为10.910 k D的荧光树状超支化聚苯硫醚(HPPS).通过亲核取代和水解反应对HPPS进行了外围氨基修饰,通过偶氮共价键使HPPS与氨基硫脲小分子相连,制备出了高灵敏度树状聚合物基多位点反应型汞离子传感器.基于汞离子与氨基硫脲脱硫关环反应和超支化聚苯硫醚对光信号的放大传递作用,传感器对汞离子有灵敏的荧光响应信号,线性范围为2.5~100 nmol/L,检出限为0.46 nmol/L.并利用分子模拟计算对反应识别机理进行了讨论.
Fluorescent dendritic polyphenylene sulfide (HPPS) with average molecular weight of 10.910 kD was synthesized by the “one-step” method using 2,4-dichlorothiophenol as the monomer. Through nucleophilic substitution and hydrolysis HPPS was modified with amino groups on the periphery and HPPS was linked with thiosemicarbazone by azo covalent bond to prepare a highly sensitive dendrimer-based multi-site reactive mercury ion sensor based on mercury ion and thiosemicarbazone The desulfurization ring-closing reaction and the hyperbranched polyphenylene sulfide on the amplification of optical signal transmission, the sensor sensitive mercury ion fluorescence response signal, the linear range of 2.5 ~ 100 nmol / L, the detection limit of 0.46 nmol / L. And The reaction recognition mechanism was discussed using molecular simulation.