Solvent-dependent fluorescence sensing of Cu2+, Hg2+, and CN‒ based on thiosemicarbazone-functionalized pillar[5]arene and its applications in actual water samples and molecular logic gates
Mingkun Yang, Yan Chen, Suoluan Zhou, Chengnuo Hu, Jun Tong Zhang, Yunhan Yang, Li-Juan Yang
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引用次数: 0
Abstract
A novel solvent-dependent fluorescent probe P5T based onapillar[5]arene containing a thiosemicarbazone unit has been synthesized. This probe serves as a dual selective fluorescent probe, which can selectively detect Cu2+ and Hg2+ ions in mixed solvent systems of acetonitrile (AN) and dimethyl sulfoxide (DMSO) with water. A significant fluorescence enhancement was observed following adding Cu2+ to the AN/H2O (v/v = 7:3) solution of P5T. The Job′s plot method and the spectrometric titrations indicated a 1:1 stoichiometric ratio between Cu2+ and the P5T probe, with a detection limit as low as 2.70 × 10‒7 M. Obvious fluorescence quenching occurred when Cu2+ or Hg2+ was added to the DMSO/H2O (v/v = 7:3) solution of P5T. The stoichiometric ratio for the P5T with Cu2+ and Hg2+ are 1:1 and 1:2, respectively, with detection limits of 3.70 × 10‒7 M and 1.20 × 10‒7 M. It is noteworthy that the reversibility of the P5T probe in the presence of S2O32‒ enables the construction of an INHIBIT logic gate using Hg2+ and S2O32‒ as inputs, facilitating the rapid and efficient detection of ions in DMSO/H2O (v/v = 7:3) solutions. P5T is a solvent-dependent dual selective fluorescent probe with high sensitivity and strong anti-interference properties. Moreover, applying this method to the analysis of Cu2+ and Hg2+ in natural water samples yielded a relative standard deviation (RSD) of less than 5%. Therefore, the solvent-dependent selective recognition capabilities and molecular logic gate functionalities of the P5T probe provides a novel approach to multiple analytical detections.
期刊介绍:
Organic Chemistry Frontiers is an esteemed journal that publishes high-quality research across the field of organic chemistry. It places a significant emphasis on studies that contribute substantially to the field by introducing new or significantly improved protocols and methodologies. The journal covers a wide array of topics which include, but are not limited to, organic synthesis, the development of synthetic methodologies, catalysis, natural products, functional organic materials, supramolecular and macromolecular chemistry, as well as physical and computational organic chemistry.