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.
在 Hg2+ 存在下,开发了新型对称双(二烷基
氨基)
吩恶嗪鎓盐的激发三重态敏化。利用这种效应来测定不同
水样中 Hg2+ 的浓度。
吩恶嗪盐传感器通过不同的光谱工具进行表征,例如:UV、FTIR、NMR 和荧光光谱。该传感器在
DMSO 中的发射带位于 347 nm。 pH 5.6 的
DMSO 中的 Hg2+ 可以显着猝灭传感器在 347 nm 处的荧光强度,并且由于 Hg2+ 与传感器之间形成强烈的络合物,在 436 nm 处出现了新的条带。利用347处谱带强度的猝灭和436处新谱带强度的增强来测定不同废
水样品中的Hg2+。测定 Hg2+ 浓度的动态范围为 8.7 × 10-10 – 1.4 × 10-6 mol L−1,检测限为 5.8 × 10−10 mol L−1,定量检测限为 1.8 × 10-9 mol L-1。