Novel dual-functional fluorescent sensors based on bis(5,6-dimethylbenzimidazole) derivatives for distinguishing of Ag+ and Fe3+ in semi-aqueous medium.

摘要: Three novel bisbenzimidazole derivatives have been synthesized and developed as dual-functional fluorescent sensors for the rapid highly selective detection of Ag+ Fe3+ ions in semi-aqueous medium with distinct spectral response first time. The absorption intensity is drastically decreased after addition Ag+. Contrarily, it markedly increased upon Fe3+. And there a good linear relation at low concentration both Fe3+, which provides quantitative method their detection. Similarly, show fluorescence towards different color change under UV light. In addition, no significant changes interference can be observed other metal ions. sensing mechanism studies confirm that N atom CN benzimidazole ring sensor 4a may bind or ion to form complex. only static quenching process 4-Ag+ complex system, but dynamic processes occur 4-Fe3+ system. Moreover, 4 steadily work solution wide range pH 4-13 rapidly respond time 10 s. Finally, successfully applied visual not solution, also test paper.