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Spectrophotometric and RGB performances of a new tetraphenylcyclopenta-derived Schiff base for the quantification of cyanide ions

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Abstract

In this communication, a new cyanide (CN) ion selective chromogenic receptor (L) was developed by reacting 2,4-dinitrophenylhydrazine with 2,3,4,5-tetraphenylcyclopenta-2,4-dienone. The sensing ability of receptor L was studied with different anions such as F, Cl, Br, I, OH, CN, SO42−, PO43−, CH3COO and NO3 by a visual test, UV-Vis spectrometry and a smartphone-based RGB tool in THF : H2O (6 : 4, v/v) media. The receptor L showed a strong absorption band at 412 nm due to the presence of donor and acceptor units that result in an intense ligand-to-ligand charge transfer (LLCT). Upon interaction with CN, the L showed a selective colour change from yellow to blue along with the formation of a new UV-Vis band at 615 nm. The absorption spectral studies indicate the formation of a complex between the L and CN with an estimated association constant of 8.9 × 103 M−1 and binding stoichiometry between them is 1 : 1. The binding interaction of L with CN was examined using 1H NMR and density functional theory (DFT) calculations. The sensitivity of L is recognized by the limit of detection (LOD) and it is 1 × 10−7 M which is lower than that in WHO guidelines (0.02 ppm) for drinking water. The colorimetric change of L has been well integrated with a smartphone RGB color value to make it an analytical signal for real-time analysis of CN with the detection limit down to 3.98 × 10−6 M. The L detects CN without any interference from other tested anions over a wide pH range 3–10. During measurements of absorbance and RGB values, all tested solutions were adjusted to pH 7.5. Besides, L was applied for the analysis of CN content present in various edible samples using spectrophotometry, test paper strips and an RGB colour tool.

Graphical abstract: Spectrophotometric and RGB performances of a new tetraphenylcyclopenta-derived Schiff base for the quantification of cyanide ions

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Publication details

The article was received on 03 Nov 2018, accepted on 17 Jan 2019 and first published on 18 Jan 2019


Article type: Paper
DOI: 10.1039/C8AY02401D
Citation: Anal. Methods, 2019, Advance Article

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    Spectrophotometric and RGB performances of a new tetraphenylcyclopenta-derived Schiff base for the quantification of cyanide ions

    V. Venkatesan, S. K. A. Kumar and S. K. Sahoo, Anal. Methods, 2019, Advance Article , DOI: 10.1039/C8AY02401D

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