Department of Chemistry, University of Kurdistan, P.O. Box 416, Sanandaj, Iran; Nanotechnology Research Center, University of Kurdistan, P.O. Box 416, Sanandaj, Iran.
Department of Chemistry, University of Kurdistan, P.O. Box 416, Sanandaj, Iran.
Spectrochim Acta A Mol Biomol Spectrosc. 2019 Jun 5;216:418-423. doi: 10.1016/j.saa.2019.03.064. Epub 2019 Mar 19.
In the present study, (E)-2,2'-(4,4'-dioxo-2,2'-dithioxo-2H,2'H-[5,5'-bithiazolylidene]-3,3'(4H,4'H)-diyl) bis(3-mercaptopropanoic acid) (DTM) as a new derivative of thiazolidine was synthesis and characterized for the detrtmination of Hg ions. Then, the CdTe@CdS QDs and DTM capped CdTe@CdS QDs were produced. The DTM-CdTe@CdS/QDs used as an effective fluorescence sensing material due to the selective interaction of DTM with Hg (II). The results indicated that the DTM-CdTe@CdS/QDs shows strong fluorescence emissions in the absence of mercury ions and efficiently quenched in presence of Hg, with the formation of a strong and stable complex between Hg and DTM. Experimental results showed that under optimal conditions, Hg could be detected with a detection limit of 0.08 nM in a linear range from 0.3 nM to 21 nM. The constructed aptasensor illustrated the high selectivity for mercury ions even in the presence of the other interfering metal ions when their concentration ratio was more than 300 times. The satisfactory results illustrated that the designed fluorescence sensor as a sensitive, reliable and easy to use approach could be applied for the facile and rapid determination of Hg in tap water.
在本研究中，（E）-2,2'-(4,4'-二氧代-2,2'-二硫代-2H,2'H-[5,5'-联噻唑基]-3,3'(4H,4'H)-二基)双(3-巯基丙酸)（DTM）作为噻唑烷的一种新衍生物被合成并用于测定 Hg 离子。然后，合成了 CdTe@CdS QDs 和 DTM 封端的 CdTe@CdS QDs。由于 DTM 与 Hg（II）的选择性相互作用，DTM-CdTe@CdS/QDs 被用作有效的荧光传感材料。结果表明，在没有汞离子的情况下，DTM-CdTe@CdS/QDs 表现出强荧光发射，而在存在 Hg 的情况下则有效地猝灭，形成了 Hg 与 DTM 之间的强稳定配合物。实验结果表明，在最佳条件下，Hg 可以在 0.3 nM 至 21 nM 的线性范围内以 0.08 nM 的检测限进行检测。即使在其他干扰金属离子的浓度比超过 300 倍的情况下，所构建的适体传感器也表现出对汞离子的高选择性。满意的结果表明，所设计的荧光传感器作为一种灵敏、可靠且易于使用的方法，可以应用于自来水中 Hg 的简便快速测定。
