Chen Qiaobin, Xu Lihua, Feng Qingqing, Zhao Jiang
School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou, P. R. China.
School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou, P. R. China.
Talanta. 2023 Dec 1;265:124887. doi: 10.1016/j.talanta.2023.124887. Epub 2023 Jun 28.
Detection abilities on tested subjects of sensors should be closely connected to the sensing unit numbers. Herein, two anion sensors ICZ-o-1S and ICZ-o-2S were synthesized by using indolo (2,3-a) carbazoles as fluorescent chromophore and salicylaldehyde as recognition site. Though UV-Vis and fluorescent ways, it demonstrated that F can induce the sensor solutions becoming colored from colorless to yellow green, and can endow them with bright green turn-on fluorescence, proving their sensitive and selective sensing on F. Accordingly, the F ion sensing studies including anti-interference abilities against to other anions on fluorescence response, stoichiometric ratios of sensor-F in 1 : 1 and 1 : 2, -OH deprotonation sensing mechanism confirmed by H NMR titration and theoretical calculation were fully covered. Most importantly, fluoride ion detection limits achieved by ICZ-o-1S and ICZ-o-2S were 1.8 × 10 M and 6.0 × 10 M, respectively, the latter with two sensing units exhibited 3 times lower detection limit outcompeted to the former with only one sensing unit, rendering the sensor design strategy of improving detecting ability by increasing sensing unit number was rational. The practical application of F detection in water-containing environment calibrated from the standard curve between the fluorescence intensity of sensor-F system and the changing F concentration was conducted. In addition, the accuracy of the sensor on detecting F was evaluated by the spiked recovery experiment, therefore, the fast and convenient F concentration detection based on the fluorescence color RGB values of the tested sensor-sample mixture was investigated. Consequently, the results obtained by these two sensors should deliver effective supports on designing high-performance sensors featuring naked-eye and fluorescence turn-on anion sensing by altering the response unit numbers.
传感器对受试对象的检测能力应与传感单元数量紧密相关。在此，以吲哚并[2,3-a]咔唑为荧光发色团、水杨醛为识别位点，合成了两种阴离子传感器ICZ-o-1S和ICZ-o-2S。通过紫外-可见光谱和荧光光谱方法表明，氟离子可使传感器溶液由无色变为黄绿色，并赋予其明亮的绿色开启荧光，证明它们对氟离子具有灵敏且选择性的传感性能。因此，全面涵盖了氟离子传感研究，包括对其他阴离子的荧光响应抗干扰能力、传感器与氟离子1:1和1:2的化学计量比、通过核磁共振滴定和理论计算证实的羟基去质子化传感机制。最重要的是，ICZ-o-1S和ICZ-o-2S实现的氟离子检测限分别为1.8×10⁻⁶ M和6.0×10⁻⁷ M，后者具有两个传感单元，其检测限比仅具有一个传感单元的前者低3倍，这表明通过增加传感单元数量来提高检测能力的传感器设计策略是合理的。进行了在含水环境中基于传感器 - 氟离子体系荧光强度与氟离子浓度变化的标准曲线校准的氟离子检测实际应用。此外，通过加标回收实验评估了传感器检测氟离子的准确性，因此，研究了基于测试的传感器 - 样品混合物荧光颜色RGB值的快速便捷的氟离子浓度检测方法。因此，这两种传感器所获得的结果应为通过改变响应单元数量来设计具有裸眼和荧光开启阴离子传感功能的高性能传感器提供有效支持。
