A new sensor based on thieno[2, 3‐b]quinoline for the detection of In3+, Fe3+ and F− by different fluorescence behaviour. (18th October 2021)

• Record Type: Journal Article
• Authors: Li, Linlin; Shang, Xiaodong; Li, Bing; Xing, Yujing; Liu, Yuanying; Yang, Xiaofeng; Pei, Meishan; Zhang, Guangyou
• Is Part Of: Luminescence. Volume 36:Number 8(2021)
• Page Start: 1891
• Page End: 1900
• Publication Date: 2021-10-18
• Subjects: F− -- Fe3+ -- fluorescent probe -- In3+ -- Schiff's base -- theoretical calculations; Luminescence -- Periodicals; Bioluminescence -- Periodicals; Chemiluminescence -- Periodicals; Luminescence -- Periodicals; 535.35
• DOI: 10.1002/bio.4119
• Languages: English
• ISSNs: 1522-7235

Abstract

Abstract: Based on thieno[2, 3‐ b ]quinoline‐2‐carbohydrazide and salicylaldehyde, a novel fluorescent probe (L ) was designed and synthesized. L could be used as a multifunctional sensor to sequentially detect In 3+ and Fe 3+ through fluorescence enhancement and fluorescence quenching in DMF/H2 O buffer solutions. At the same time, L had good anti‐interference ability, which could still detect In 3+ and Fe 3+ well in the presence of other metal ions. For F −, it could be detected by enhancing the fluorescence change caused by the introduction of Al 3+ . When other anions were present, the detection of F − would not be interfered. The detection limits of In 3+, Fe 3+ and F − were 1.16 × 10 −10 M, 2.03 × 10 −8 M and 7.98 × 10 −9 M, respectively. The complexation model and sensing mechanism between L and In 3+, Fe 3+ and F − were confirmed by calculating structural optimization and energy optimization using Gaussian 09 software. Abstract : The introduction of In 3+ cause amide tautomerization and CHEF processes, which leads to the fluorescence enhancement of L . After Fe 3+ is added, the amide tautomerization process is inhibited, and because Fe 3+ has paramagnetism, the existing fluorescence is quenched. The introduction of Al 3+ and F − also causes amide tautomerization and CHEF processes, which results in fluorescence enhancement of L .