A simple azoquinoline based highly selective colorimetric sensor for CN⁻ anion in aqueous media

Abstract

Azoquinoline based sensor AZQ was designed and synthesized as a new molecular ion sensor containing an azo group in its structure. The structural characterization of AZQ was carried out using FTIR, NMR, mass, and elemental analysis. Then, the interaction of AZQ with anions was observed visually and UV–vis measurements were made in EtOH/H2O (1:1, v/v) solvent mixture. As a result of this investigation, it was determined that AZQ is a fast and highly selective sensor for CN− ions. The solution colour of AZQ changed from light yellow to orange only in the presence of CN− ions. The limit of detection of AZQ was calculated as 2.6 μmol/L from anion titration experiments. Also, to identify the interaction mechanism of AZQ with CN− ions, 1H NMR spectra of AZQ in the presence of CN− anions were recorded and the structure was proposed for AZQ-CN− host–guest complex.

A Coumarin–Hemicyanine Deep Red Dye with a Large Stokes Shift for the Fluorescence Detection and Naked-Eye Recognition of Cyanide

“…5/5 nm, voltage: 700 V (B); UV-Vis absorption spectra (C) and the effect of time-dependent UV-Vis absorbance of probe W-CN − solution at λ = 428/585 nm (D); Table S1: Summary of crystal data for W; Table S2: Hydrogen-bonding geometries of compound W; Table S3: Comparison data with reported CN − sensors. References [23,[29][30][31][32][33][34][35] are cited in the supplementary materials.…”

Ligational behavior of bidentate nitrogen–oxygen donor 8‐quinolinolazodye toward Ni2+ and Zn2+ ions: Preparation, spectral, thermal, experimental, theoretical, and docking studies

“…Numerous areas of science and technology make use of the qualities provided by the azo group and 8‐hydroxyquinoline moiety. [ 16 ] They have a bidentate form of coordination and are colorful ligands. [ 17 ] By using different spectroscopic techniques and theoretical molecular models, two 8‐hydroxyquinoline chloride and iodide derivatives have been studied in detail.…”

A novel fluorescent sensor based on 4-(diethylamino)-2-(hydroxy)-phenyl imine functionalized naphthalimide for highly selective and sensitive detection of CN– and Fe3+

“…[11][12][13][14] Thus, the design and synthesis of optical sensors for specific detection of CNhave been an important task. [15][16][17] Over the past few years, optical sensing strategies for CNadopted in some literatures, such as hydrogen-bonding interactions, 18 nucleophilic addition, [19][20] and deprotonation. 21 Iron ion (particularly Fe 3+ ), which has special chemical properties and plays a crucial role in the process of the majority biochemical reactions.…”