Colorimetric recognition of Cu2+ and fluorescent detection of Hg2+ in aqueous media by a dual chemosensor derived from rhodamine B dye with a NS2 receptor
| Autor: | Shuang-Quan Zang, Qing-Chuan Feng, Hong Xu, Min Li, Lu Dong, Thomas C. W. Mak, Yan Sun |
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| Rok vydání: | 2016 |
| Předmět: |
inorganic chemicals
Fluorescence-lifetime imaging microscopy 02 engineering and technology 010402 general chemistry Photochemistry 01 natural sciences chemistry.chemical_compound Materials Chemistry Rhodamine B Electrical and Electronic Engineering Instrumentation Detection limit Metals and Alloys 021001 nanoscience & nanotechnology Condensed Matter Physics Fluorescence 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Proton NMR Titration Absorption (chemistry) 0210 nano-technology Derivative (chemistry) Nuclear chemistry |
| Zdroj: | Sensors and Actuators B: Chemical. 226:332-341 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2015.11.132 |
| Popis: | A rhodamine B derivative bearing a NS2-containing receptor (L) is developed as a dual chemosensor for detection of Cu2+ and Hg2+ in aqueous media. L shows highly sensitive colorimetric response to Cu2+ and selectively turn-on fluorescent response to Hg2+ with very low detection limits of 1.63 and 2.36 μM, respectively. The significant absorption enhancement (251-fold) accompanied with a visual color change from colorless to purple upon interaction with Cu2+, making L a suitable “bare-eye” indicator for Cu2+. By means of Job's plot, 1H NMR titration and ESI-MS studies, both 1:1 binding modes (L/Cu2+ and L/Hg2+) are confirmed and a possible sensing mechanism is further proposed. The response behaviours of L toward Cu2+ and Hg2+ are pH independent in a wide range (pH 4.0–9.0). Proof-of-concept experiment demonstrates the potential application of L for trace Cu2+ and Hg2+ detection in complicated environmental water samples. More importantly, the turn-on fluorescent chemosensor L with good membrane-permeable property is successfully applied to microscopic imaging for the detection of Hg2+ in PC3 cells. |
| Databáze: | OpenAIRE |
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