A coumarin-based fluorescent and colorimetric chemosensor for rapid detection of fluoride ion. Issue 10 (9th March 2017)

• Record Type: Journal Article
• Authors: Ma, Liulei; Leng, Taohua; Wang, Kai; Wang, Chengyun; Shen, Yongjia; Zhu, Weihong
• Is Part Of: Tetrahedron. Volume 73:Issue 10(2017)
• Page Start: 1306
• Page End: 1310
• Publication Date: 2017-03-09
• Subjects: Coumarin -- Thiosemicarbazone -- Fluorescent probe -- Fluoride anion; Chemistry, Organic -- Periodicals; 547.005
• DOI: 10.1016/j.tet.2017.01.034
• Languages: English
• ISSNs: 0040-4020

Abstract

Abstract: A novel coumarin-based compound1 featuring thiosemicarbazone as binding unit, was reported as a colorimetric and fluorescent probe for the detection of fluoride anion. The addition of F − to a solution of probe1 in tetrahydrofuran resulted in evident naked-eye color change from green-yellow to orange-red under daylight and obvious fluorescence quenching within 3 s. And the detection limit toward F − was calculated to be as low as 2.16 × 10 −7 mol/L. 1 H NMR titrations proved that the interaction between1 and fluoride ion: hydrogen bond at low fluoride ion concentration, deprotonation at high fluoride ion concentration. Besides, it exhibited highly sensitivity and selectivity for F − over other examined ions (Cl −, Br −, I −, AcO −, NO3 −, HSO4 −, H2 PO4 − ) in tetrahydrofuran solution. Graphical abstract: A colorimetric and fluorescent sensor for the detection of fluoride anion has been designed and synthesized. The sensor showed evident naked-eye color variation from green-yellow to orange-red after treatment with F −, and its fluorescence was effectively quenched within 3 s.