Cyanide selective colorimetric and turn-on fluorimetric sensing by naphthohydrazide derivative and its application in real sample analysis

• Published in: Materials today : proceedings 2023, Vol.78, p.108-113
• Main Authors: Kumar Yadav, Komal, Raina, Ashish, Ghosh, Tamal
• Format: Article
• Language: English
• Subjects: 3-hydroxy-2-naphthoic acid hydrazide; Colorimetric and fluorometric sensor; Cyanide selective sensor; o-vanillin; Real water sample analysis
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2022.11.309

•Compound HNV behaves as selective colorimetric and turn-on fluorimetric sensor for cyanide in aqueous medium (H2O/DMSO, 7:3 v/v).•Both colourless solution and Whatman filter paper test strip of HNV turn to yellow in presence of CN− ion selectively.•Sensor HNV binds cyanide ion using its OH and NH protons, as confirmed by 1H NMR titration data.•Compound HNV can be used for the detection of trace amount of CN− in real water samples. Synthesis, characterization of (E)-3-hydroxy-N'-(2-hydroxy-3-methoxybenzylidene)-2-naphthol hydrazide (HNV) and its sensing ofCN− ion have been described in this paper. Probe HNV is formed by the reaction of o-vanillin and 3-hydroxy-2-naphthoic acid hydrazide and is confirmed by FT-IR, 1H NMR and ESI-MS spectrometry. Addition of CN− ion in probe HNV results in the establishment of a new absorption band at 400 nm in UV–visible spectrum and turn-on fluorescent behavior in H2O-DMSO (7:3 v/v) mixed solvent. Fluorescence intensity of probe HNV is found to be enhanced by 13.1 times in presence of CN−. Colorless solution of HNV is converted to yellow on addition of CN− ion and similar change in color is noticed on Whatman filter paper test strips also. Binding mechanism for the probe HNV with CN− is validated using 1H NMR titration. HNV can be applied for the analysis of real water samples. .