An Easy Detection of Sulfide by an Imine-Bond Cleavage-Based Fluㅁorescence Chemosensor: Smartphone and Paper-Strip Applications

• Published in: The Korean journal of chemical engineering pp. 669 - 678
• Main Authors: Song Chanwoo, Lee Jae Jun, Nam Hyejin, 김철
• Format: Journal Article
• Language: English
• Published: 한국화학공학회 01.03.2025
• Subjects: 화학공학
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-024-00334-8

We designed an imine-bond cleavage-based fl uorescent chemosensor CDH (( E )-(5-chloro-2-((3,5-dichloro-2-hydroxyben zylidene)amino)phenyl)(phenyl)methanone) for detecting S 2− . The sensor CDH selectively sensed S 2− among various anions through fl uorescent change. The fl uorescent change was cyan turn-on from colorless with a high quantum yield (λ ex = 427 nm, Φ = 0.486), resulting in strong fl uorescent intensity. With the result of Job plot, the reaction of S 2− and CDH turned out to be a 1:1 interaction. The detection limit for S 2− of CDH was 2.85 μM. The reaction process of S 2− by CDH was demonstrated to be imine-bond cleavage through ESI-mass, 1 H NMR titration, and theoretical calculations. Additionally, test-strip and smartphone applications were successfully constructed for S 2− detection, and these fi ndings revealed that CDH could be eff ectively utilized for sulfi de sensing without sophisticated instruments. KCI Citation Count: 0