Silpcharu Komthep, Soonthonhut Siraporn, Sukwattanasinitt Mongkol, Rashatasakhon Paitoon
Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
Nanotec-CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
ACS Omega. 2021 Jun 17;6(25):16696-16703. doi: 10.1021/acsomega.1c02744. eCollection 2021 Jun 29.
A novel spirobifluorene derivative bearing two bissulfonamido groups is successfully synthesized by Sonogashira coupling. This compound exhibits a strong fluorescence quenching by Cu(II) ion in a 50% mixture between acetonitrile and 20 mM pH 7.0 -(2-hydroxyethyl)piperazine-'-ethanesulfonic acid (HEPES) buffer with a detection limit of 98.2 nM. However, this sensor also shows ratiometric signal shifts from blue to yellow in the presence of Zn(II), Pb(II), and Hg(II) ions. The static quenching mechanism is verified by the signal reversibility using ethylenediaminetetraacetic acid (EDTA) and the Stern-Volmer plots at varying temperatures. The Cu(II)-spirobifluorene complex shows a highly selective fluorescence enhancement upon the addition of CN ion with the detection limit of 390 nM. The application of this complex for quantitative analysis of spiked CN ion in real water samples resulted in good recoveries.
通过Sonogashira偶联成功合成了一种带有两个双磺酰胺基的新型螺二芴衍生物。该化合物在乙腈和20 mM pH 7.0 -（2-羟乙基）哌嗪-1-乙磺酸（HEPES）缓冲液的50%混合物中，对Cu（II）离子表现出强烈的荧光猝灭，检测限为98.2 nM。然而，该传感器在存在Zn（II）、Pb（II）和Hg（II）离子时也显示出从蓝色到黄色的比率信号变化。通过使用乙二胺四乙酸（EDTA）的信号可逆性和不同温度下的Stern-Volmer图验证了静态猝灭机制。加入CN离子后，Cu（II）-螺二芴配合物表现出高度选择性的荧光增强，检测限为390 nM。该配合物用于实际水样中加标CN离子的定量分析，回收率良好。
