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Synthesis and Characterization of New Light Emitter Symmetrical Phenoxazinium Salt and Its Potential Application as Sensor for Assessment of Hg2+ |
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| Authors: | M S Attia A O Youssef Abdel-Sattar S H Elgazwy Samia A El Abady Samia M Agami Safaa I Elewa |
| Institution: | 1. Analytical Chemistry Division, Faculty of Science, Ain Shams University, Cairo, Egypt 2. Organic Chemistry Division, Faculty of Science, Ain Shams University, Cairo, Egypt 3. Organic Chemistry Division, Faculty of Women, Ain Shams University, Heliopolis, P.O.Box 11757, Cairo, Egypt |
| Abstract: | The sensitization of the excited triplet state of a novel symmetrical Bis(dialkylamino)phenoxazinium salt was developed in the presence of Hg2+. This effect was used to determine the concentration of Hg2+ in different water samples. The phenoxazinium salt sensor was characterized by different spectroscopic tools such as: UV, FTIR, NMR and fluorescence spectra. The sensor has an emission band at 347 nm in DMSO. Hg2+ in DMSO at pH 5.6 can remarkably quench the fluorescence intensity of the sensor at 347 nm and a new band was appeared at 436 nm due to the strong complex formation between Hg2+ and sensor. The quenching of the band intensity at 347 and the enhancement of the intensity of the new band at 436 were used to determine the Hg2+ in different waste water samples. The dynamic range found for the determination of Hg2+ concentration is 8.7?×?10-10 – 1.4?×?10-6 mol L?1 with a detection limit of 5.8?×?10?10 mol L?1 and quantification detection limit of 1.8?×?10-9 mol L-1. |
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