Diao Haipeng, Niu Weiping, Liu Wen, Feng Liheng, Xie Jun
School of Basic Medical Sciences, Shanxi Medical University, Taiyuan 030001, PR China.
School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, PR China; Shanxi Station for Plant Protection and Quarantine, Taiyuan 030001, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2017 Jan 5;170:65-8. doi: 10.1016/j.saa.2016.07.014. Epub 2016 Jul 8.
A facile fluorescence switch based on Schiff base 2,2'-[1,3-phenylenbis- (methylidynenitrilo)]bis[benzenethiol] (PMBB) has been developed and used to sensing metal ions. UV-vis absorption and fluorescence emission spectra show that the PMBB receptor has high selectivity and sensitivity for Cu(II) ions. Based on the photoinduced electron transfer (PET) and chelation enhanced fluorescence (CHEF) mechanisms, the receptor exhibits an fluorescence "turn-on" switch signal for Cu(II). The 1:1 binding mode of PMBB and Cu (II) ions can be obtained by the Job-plot and ESI-Mass spectra data. Noticeably, the color changes (from colorless to yellow) of PMBB solutions for Cu(II) sensing can be observed by naked eyes in the sunlight. The detection limit of the receptor for Cu(II) may reach 10(-7)mol/L with a good linear relation in the lower concentrations of Cu(II). To develop the practical application, the Cu(II) ions in swimming pool water samples were detected. Results show that PMBB receptor as a fluorescent probe can use to detect the trace level of Cu(II) in the environmental samples. This work contributes to providing a facile strategy for designing efficient probes and developing their practical application value.
基于席夫碱2,2'-[1,3-亚苯基双(亚甲基腈)]双苯硫酚开发了一种简便的荧光开关，并将其用于检测金属离子。紫外-可见吸收光谱和荧光发射光谱表明，PMBB受体对Cu(II)离子具有高选择性和高灵敏度。基于光诱导电子转移(PET)和螯合增强荧光(CHEF)机制，该受体对Cu(II)呈现荧光“开启”开关信号。通过Job曲线和电喷雾质谱数据可得到PMBB与Cu(II)离子的1:1结合模式。值得注意的是，在阳光下肉眼可观察到用于检测Cu(II)的PMBB溶液的颜色变化(从无色变为黄色)。该受体对Cu(II)的检测限可达10(-7)mol/L，在较低浓度的Cu(II)范围内具有良好的线性关系。为了开发实际应用，对游泳池水样中的Cu(II)离子进行了检测。结果表明，PMBB受体作为荧光探针可用于检测环境样品中的痕量Cu(II)。这项工作有助于提供一种简便的策略来设计高效探针并开发其实际应用价值。
