ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Pyridine-coumarin chemosensor for selective determination of CN⁻ ions in water and organic media via ester bond cleavage

Seda Cinar

Department of Chemistry, Polatlı Faculty of Arts and Sciences, Ankara Hacı Bayram Veli University, Polatlı, Turkey

E-mail: seda.cinar@hbv.edu.tr

Received: 18 October 2025  Accepted: 28 May 2026

Abstract:

This study focuses on the effective sensing of common ions by developing a coumarin-based chemosensor. In this study, a novel pyridine–coumarin conjugate (1) was synthesized and characterized for the selective and sensitive detection of CN⁻ ions in water. The structure of the chemosensor was confirmed by ¹H NMR, ¹³C NMR, and mass spectrometric analyses. Spectroscopic measurements in water indicated the selective fluorimetric sensing of CN⁻ ions with a limit of detection of 29 nM. In contrast, in acetonitrile, 1 revealed significant bathochromic shifts and increased fluorescence in the presence of CN⁻ and F⁻, with 0.24 nM and 2.17 nM limit of detection, respectively.

Keywords: Pyridine-coumarin conjugate; Chemosensor; Fluorescence

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-026-05131-7

Chemical Papers 80 (10) 12287–12295 (2026)