摘要:
It is an important challenge to develop a chemosensor for trace uranyl ion in an aqueousmediumfor sustainable development of nuclear energy and environmental conservation. A conjugated fluorescent polymer sensor P2 based on amidoxime groups and polyfluorene, which showed good hydrophilous resulting adequate contact with uranyl ions and selectivity and sensitivity even in the presence of other metal ions in DMA/H2O (v/v = 20:80, pH= 6.0) solution, for uranyl ion was designed and prepared in this work. And it possesses good thermal stability and a larger Stokes shift (108 nm). Importantly, the fluorescence quenching occurredwhen P2 combining uranium. It had a good linear relationship with UO22+ concentration in the range of 10 to 200 nM with a fairly low LOD 7.4 x 10(-9) M. Interaction properties between the sensor P2 and UO22+ and the fluorescent mechanism were investigated by density functional theory (DFT). More importantly, the sensor can be successfully used for the detection of uranyl ion in environmental solutions. This work suggests that conjugated fluorescent polymer with amidoxime groups will be a prospective sensor of uranyl ion in the environmental sample. (C) 2020 Elsevier B.V. All rights reserved.
通讯机构:
[Hu, Qinghua; Wang, Hongqing] S;School of Chemistry and Chemical Engineering, Hunan Key Laboratory for the Design and Application of Actinide Complexes, University of South China, 28 Changsheng West Road, Hengyang, Hunan 421001, PR China. Electronic address:
关键词:
Fluorescent sensors;Phosgene;Ratiometric;AIE and TICT;Colorimetric
摘要:
In this paper, we specifically designed and synthesized an excellent colorimetric and ratiometric fluorescent sensor DPA-CI for rapid and convenient detection of the highly toxic phosgene. DPA-CI was developed by incorporated a diphenylamine (DPA) and a 2-imine-3-benzo[d]imidazole as the enhanced push-pull electronic structure into the coumarin fluorophore matrix. The sensor DPA-CI towards phosgene sensing exhibited both visible colorimetric and ratiometric fluorescent color change in solution and in gaseous conditions with TICT and AIE mechanism respectively, which can be easily distinguished by using the naked eye. Also, the sensor DPA-CI showed splendid sensing performance such as excellent selectivity, rapid response (less than 8 s in THF and 2 min in gaseous condition), and fair sensitivity (limit of detection less than 0.11 ppm in gaseous condition and 0.27 mu M in solution). The design strategy based on enhanced push-pull electronic structure with AIE and TICT properties will be helpful to construct a solid optical sensor with excellent potential application prospects for portable and visual sensing of gaseous phosgene through distinct color and ratiometric fluorescence change by the naked eyes. (C) 2021 Elsevier B.V. All rights reserved.
作者机构:
[彭超; 王榆元; 邓昌爱] College of Chemistry and Chemical Engineering, University of South China, Hengyang;Hunan;421001, China;[赵方方; 游奎一] College of Chemical Engineering, Xiangtan University, Xiangtan;411105, China
通讯机构:
College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, China
摘要:
In view of the few reports of the near-infrared emissive probe for fluorine ions, we herein designed and synthesized a new easy-to-get colorimetric and near-infrared emissive fluorescent probe (IS-NR-F) with a large Stokes shift (>127 nm). Based on specific F- triggered desilylation reaction induced enhanced ICT strategy involving the donor phenolate anion and the acceptor malononitrile, the probe exhibited dual colorimetric and fluorescent turn-on responses, and provided excellent selectivity for fluoride ions. The fluorescent response at 665 nm displayed very good linear relationship in the wide concentration range and deduced a low detection limit of 0.09 ppm. The detection mechanism was confirmed by H-1 NMR, ESIMS, and TLC calculation. Moreover, probe IS NR F has been successfully employed to detect F - in tap water, toothpaste samples, and fluorescent imaging of F- in HeLa cells. (C) 2019 Elsevier Ltd. All rights reserved.
摘要:
<![CDATA[<ce:abstract xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns="http://www.elsevier.com/xml/ja/dtd" id="ab0005" xml:lang="en" view="all" class="author"><ce:section-title id="st0005">Abstract</ce:section-title><ce:abstract-sec id="as0005" view="all"><ce:simple-para id="sp0080" view="all">A reversible Schiff's base fluorescence probe for Al<ce:sup loc="post">3+</ce:sup>, (3,5-dichloro-2- hydroxybenzylidene) quinoline-2-carbohydrazide (<ce:bold>QC</ce:bold>), based on quinoline derivative has been designed, synthesized and evaluated. The<ce:bold>QC</ce:bold>exhibited a high sensitivity and selectivity toward Al<ce:sup loc="post">3+</ce:sup>in EtOH-H<ce:inf loc="post">2</ce:inf>O (v/v=1:9, pH=6) by forming a 1:1 complex with Al<ce:sup loc="post">3+</ce:sup>and the detection limit of<ce:bold>QC</ce:bold>for Al<ce:sup loc="post">3+</ce:sup>was as low as 0.012μM. Furthermore, these results displayed that the binding of<ce:bold>QC</ce:bold>Al<ce:sup loc="post">3+</ce:sup>was broken by F<ce:sup loc="post">?</ce:sup>, so this system could be used to monitor F<ce:sup loc="post">?</ce:sup>in the future. The enhancement fluorescence of the<ce:bold>QC</ce:bold>could be attributed to the inhibition of PET and ESIPT and the emergency of CHEF process induced by Al<ce:sup loc="post">3+</ce:sup>. More importantly,<ce:bold>QC</ce:bold>was not only successfully used for the determination of trace Al<ce:sup loc="post">3+</ce:sup>in the tap water and the human blood serum, but was valid for fluorescence imaging of Al<ce:sup loc="post">3+</ce:sup>in the Hela cells.</ce:simple-para></ce:abstract-sec></ce:abstract><ce:abstract xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns="http://www.elsevier.com/xml/ja/dtd" id="ab0010" class="graphical" xml:lang="en" view="all"><ce:section-title id="st0010">Graphical Abstract</ce:section-title><ce:abstract-sec id="as0010" view="all"><ce:simple-para>Display Omitted</ce:simple-para></ce:abstract-sec></ce:abstract><ce:abstract xmlns:c