Quinoxaline Based Three Channel Fluorescent-colorimetric Chemosensor for Selective and Sensitive Detection of Ag⁺...

Herein we describe a quinoxaline mono Schiff base, synthesised from benzil and o-phenylene diamine that may be used as a fluorescent-colourimetric chemosensor to detect Ag⁺ ions in organic media with high selectivity and sensitivity over other competitive ions. The sensing processes were operated by visual change, absorption, and emission measurements, and the binding sites were confirmed by FTIR and single-crystal structure of the Ag(I)- complex. From Job-plot analysis, ESI-mass spectra and XRD studies 1:2 binding stoichiometry between host-guest was observed. The detection limit values for Ag⁺ obtained 7.9 × 10^-6 M colorimetrically and 1.25 × 10^-6 M fluorometrically. Moreover the receptor L could operate in a wide range of pH 6-11 including physiological pH, and can be successfully applied to environmental samples, BSA proteins and living cells for detecting Ag⁺ ion. Based on these findings, we think that the receptor L will be an impressive addition to the field of straightforward 2,3-Diphenylquinoxaline based Schiff base chemosensors for analytes.