Rhodamine B conjugate for rapid colorimetric and fluorimetric detection of aluminium and tin ions and its application in aqueous media
| Autor: | Mok Piew Heng, Kong Wai Tan, Poh Wei Cheah, Amnor Izati, Chew Hee Ng |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Detection limit
chemistry.chemical_classification Ketone integumentary system 010405 organic chemistry Metal ions in aqueous solution 010402 general chemistry 01 natural sciences Fluorescence Binding constant 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound chemistry Materials Chemistry Rhodamine B Physical and Theoretical Chemistry Selectivity Nuclear chemistry Conjugate |
| Zdroj: | Inorganica Chimica Acta. 512:119901 |
| ISSN: | 0020-1693 |
| Popis: | A new fluorescent chemosensor (MEK) was synthesized from conjugation of rhodamine B hydrazide and methyl ethyl ketone. It exhibited features that would facilitate the ‘naked-eye’ detection, including excellent selectivity and high sensitivity towards Al3+ and Sn2+ ions. Stronger binding strength was recorded in the formation of sensor-Al3+ complex, where the binding constant (Ka) was 3.58 × 1010 M−1. Detection limits of MEK for Sn2+ and Al3+ was 5.10 μM and 8.96 μM respectively. Moreover, a 1:2 and 1:1 binding stoichiometry between this sensor with Al3+ and Sn2+ was verified via Job’s plot and ESI-MS. Reversibility of the sensor as metal ions detector was evaluated with the introduction of the common quencher EDTA and it showed that MEK can be used repeatedly up to 6 times. Differences in the fluorescence profiles of sensor and the sensor-metal complexes (Al3+ and Sn2+) suggested the possible applications of MEK as detection kit for these metal ions. Interestingly, the on-site assay study shown obvious colour changes and fluorescence, thereby reflecting a potentially useful way in differentiating Al3+ and Sn2+. The combination of significant fluorescence response along with tunable selectivity is therefore notably practical for the application of this sensor. |
| Databáze: | OpenAIRE |
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