Abstract
Colorimetric chemosensors L1 and L2, based on isoniazid hydrazones, have been designed for the highly sensitive and selective recognition of CN- ion. Competing experiments were conducted with various other anions such as F-, Cl-, Br-, I-, SCN-, ClO3-, ClO4-, NO3-, H2PO4-, SO32-, and HSO4- in an acetonitrile solution. In the UV-Vis spectra, a bathochromic shift in the absorption bands of both hydrazones was observed following the addition of cyanide. These spectral changes were accompanied by a color transition from transparent to orange for L1 and from pale yellow to peach for L2, which is attributed to the deprotonation of the chemosensors. The detection limits for cyanide ions were determined to be 0.36µM for L1 and 2.79µM for L2 using the 3σ rule. Quantum chemical calculations were employed to optimize the structure of the chemosensors, compute their UV-Vis spectra, and confirm the proposed detection mechanism for CN⁻ ions.
Published Version
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