- Turkish Journal of Chemistry
- Vol: 39 Issue: 5
- Effective recognition of multiple anions by an azobenzene--Al$^{\mathbf{3+}}$ system
Effective recognition of multiple anions by an azobenzene--Al$^{\mathbf{3+}}$ system
Authors : Ye Zhang, Ping Jia, Zhangfa Tong, Hai-bo Liu, Jing Wang
Pages : 905-916
View : 8 | Download : 3
Publication Date : 9999-12-31
Article Type : Makaleler
Abstract :A ready-to-use multifunctional coordinative system, 2,2'-dihydroxyazobenzene --aluminum (III) (DHAB--Al$^{3+})$, was created to recognize several anions effectively through three channels, namely colorimetric detection, UV-Vis spectroscopy, and fluorescence spectroscopy. Under naked eye visualization, the H$_{2}$PO$_{4}^{-}$ can be readily distinguished from the other anions by the DHAB--Al$^{3+}$ system through a change in color from reddish-orange to light yellow. H$_{2}$PO$_{4}^{-}$ was qualitatively detected by using UV-Vis and fluorescence spectra. Differentiating SO$_{3}^{2-}$, HPO$_{4}^{2-}$, and HCO$_{3}^{-}$ anions colorimetrically is difficult; thus, CO$_{3}^{2-}$, SO$_{3}^{2-}$, HPO$_{4}^{2-}$, and HCO$_{3}^{-}$ were discriminated by adopting distinct changes in the UV-Vis spectra. CO$_{3}^{2-}$, HPO$_{4}^{2-}$, and HCO$_{3}^{-}$ were accurately quantified using fluorescence spectra. The DHAB--Al$^{3+}$ system responded to H$_{2}$PO$_{4}^{-}$ and CO$_{3}^{2-}$ via a sensing mechanism based on a displacement approach. By contrast, the system responded to SO$_{3}^{2-}$, HPO$_{4}^{2-}$, and HCO$_{3}^{-}$ based on a binding site--signaling subunit approach. The DHAB--Al$^{3+}$ system can determine the concentration ranges of H$_{2}$PO$_{4}^{-}$ with the naked eye and quantify CO$_{3}^{2-}$, SO$_{3}^{2-}$, HPO$_{4}^{2-}$, and HCO$_{3}^{-}$ through UV-Vis spectra.Keywords : Multifunctional, colorimetrically, DHAB--Al$^{3+}$ system, anions