ABSTRACT

2ʹ-(2-((4-(methylthio)phenyl)amino)-2-oxoethoxy)-[1,1ʹ-biphenyl]-2-yl 5(dimethyl amino)naphthalene-1-sulphonate (1) was synthesised and used as a F⁻ ion sensor. The selectivity of sensor 1 with various anions (F⁻, Cl⁻, Br⁻, CH₃COO⁻, C₆H₅COO⁻ and H₂PO₄⁻) in DMSO was evaluated by ¹H NMR, UV-visible and fluorescence study. For ¹H NMR, an amide proton of sensor 1 disappeared due to the deprotonation reaction upon addition of F⁻ ion. On the contrary, the proton signal of HF₂⁻ emerged at 16.11 ppm. Upon addition of F⁻ ion, sensor 1 showed a new absorption band at 300 nm and the solution turned colourless. For fluorescence response, sensor 1 exhibited the enhancement of emission intensity at 434 nm with slight blue shift when titrated with F⁻ ion. These results suggest that sensor 1 possessed high sensitivity and selectivity towards F⁻ ion detection. In addition, the sensor 1 test strip coated on TLC plates and filter papers were demonstrated for specific detection F⁻ ion.

摘要

合成并使用了2′-(2-((4-(甲硫基)苯基)氨基)-2-氧代乙氧基)-[1,1′-联苯]-2-基5(二甲基氨基)萘-1-磺酸盐( 1 )作为 F ^-离子传感器。^通过1 H NMR、紫外可见和荧光评估传感器1在 DMSO 中对各种阴离子（F ^-、Cl ^-、Br ^-、CH ₃ COO ^-、C ₆ H ₅ COO ^-和 H ₂ PO ₄ ^- ）的选择性学习。对于¹ H NMR，传感器1的酰胺质子由于加入 F ^-离子后的去质子化反应而消失。相反，HF ₂ ^-的质子信号出现在 16.11 ppm。添加 F ^-离子后，传感器1在 300 nm 处显示出新的吸收带，溶液变为无色。对于荧光响应，当用 F ^-离子滴定时，传感器1在 434 nm 处表现出发射强度的增强，具有轻微的蓝移。这些结果表明传感器1对 F ^-离子检测具有高灵敏度和选择性。此外，传感器1涂在 TLC 板上的测试条和滤纸被证明可用于特异性检测 F ^-离子。