Related Experiment Video
Updated: Mar 16, 2026

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
Published on: August 19, 2013
Structurally simple azo based chromogenic R1 for the selective sensing of cyanide ion in aqueous medium
Palanisamy Kalpana1, Sivalingam Suganya1, Sivan Velmathi1
1Organic and Polymer Synthesis Laboratory, Department of Chemistry, National Institute of Technology, Tiruchirappalli, 620 015, India.
Abstract:
Structurally simple azo linked Schiff base R1 was synthesized and characterized using IR, 1H NMR and mass spectroscopic techniques. The selective sensing of cyanide anion over other anions such as fluoride, chloride, bromine, iodide, acetate, nitrate, hydrogen sulphate and dihydrogenphosphate was revealed by naked-eye color change and UV-vis spectra. Addition of CN- ions to the R1 showed a dramatic change in color from pale yellow to intense yellow along with the formation of a new band at 415nm in the absorption spectrum even in 100% aqueous medium. The interaction between R1 and cyanide was also investigated using 1H NMR titration study. The R1 showed limit of detection (LOD) up to micromolar level at 2.72×10-6M. Job's plot reveals the existing binding mode of R1 and CN- ion in molar ratio of 1:1 (R1:CN-).
More Related Videos
07:44Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
Published on: July 6, 2016
09:51TD-DFT Guided Advanced E-Eye Sensing Technique for On-site Quantification of Fe, Cr, F, and As in the Environmental, Biological, and Food Samples
Published on: September 19, 2025
Related Concept Videos
Aryldiazonium Salts to Azo Dyes: Diazo Coupling
Complexometric Titration: Overview
Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview