A novel approach to distinguish coumaric isomers using Briggs-Rauscher electrochemical oscillator.
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| Title: | A novel approach to distinguish coumaric isomers using Briggs-Rauscher electrochemical oscillator. |
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| Authors: | Uddin, Waqar1,2 (AUTHOR) vickyfuelche@yahoo.com, Alanazi, Abdullah K.3 (AUTHOR), Khan, Junaid4 (AUTHOR), Khan, Mubashir Ali5 (AUTHOR) |
| Source: | Journal of Applied Electrochemistry. Sep2025, Vol. 55 Issue 9, p2533-2540. 8p. |
| Subjects: | Coumarin derivatives, Hydroxycinnamic acids, Electrochemical analysis, Oscillating chemical reactions, Oxidizing agents, Perturbation theory, Structural analysis (Science) |
| Abstract: | Arrangement of atoms in compounds leads to a variety of products (isomers), which can exhibit different responses due to physical and chemical vulnerabilities. Measuring the vulnerability of such isomers of single compound using cost-effective methodologies are embracing. Forgoing-in-view, an attempt has been made to distinguish between two positional isomers, o-Coumaric acid (o-CA) and p-Coumaric acid (p-CA) based on their perturbation effects using a novel Briggs-Rauscher (BR) electrochemical oscillating system (H2SO4–CH₂(COOH)₂–KI–H2O2 & tetra-aza-macrocyclic Ni-Complex catalyst ([NiL](ClO4)2) is proposed in this article. The ligand "L" in [NiL](ClO4)2 is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene which is highly vulnerable to external perturbation due the presence of pi-bond. Experimental results show that adding equal amounts of the same concentrations of o-CA & p-CA separately into the active BR electrochemical oscillator could temporarily cease the oscillations, which then regenerate after inhibition time (tin). However, the tin caused by the o-CA is longer compared to the tin initiated by p-CA. Moreover, when tin was plotted against the concentrations of o-CA & p-CA, two distinct linear regression curves were obtained for these isomers over the concentration range of 2.3 × 10–5 mol L−1 ~ 2.5 × 10–4 mol L−1, with a correlation coefficient of 0.98, clearly demonstrating the different behaviors of these isomers. Thus, the isomers were successfully distinguished. A mechanistic approach based on Furrow-Cervellati-Amadori (FCA) and Noyes-Field (NF) models was designed and justify the ceasing and regeneration of typical oscillations due to perturbation. Briefly, the intermediate species, HOO⋅ (hydroperoxyl radical), produced during the course of oscillatory reactions, oxidizes additives into their respective quinones. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Arrangement of atoms in compounds leads to a variety of products (isomers), which can exhibit different responses due to physical and chemical vulnerabilities. Measuring the vulnerability of such isomers of single compound using cost-effective methodologies are embracing. Forgoing-in-view, an attempt has been made to distinguish between two positional isomers, o-Coumaric acid (o-CA) and p-Coumaric acid (p-CA) based on their perturbation effects using a novel Briggs-Rauscher (BR) electrochemical oscillating system (H2SO4–CH₂(COOH)₂–KI–H2O2 & tetra-aza-macrocyclic Ni-Complex catalyst ([NiL](ClO4)2) is proposed in this article. The ligand "L" in [NiL](ClO4)2 is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene which is highly vulnerable to external perturbation due the presence of pi-bond. Experimental results show that adding equal amounts of the same concentrations of o-CA & p-CA separately into the active BR electrochemical oscillator could temporarily cease the oscillations, which then regenerate after inhibition time (tin). However, the tin caused by the o-CA is longer compared to the tin initiated by p-CA. Moreover, when tin was plotted against the concentrations of o-CA & p-CA, two distinct linear regression curves were obtained for these isomers over the concentration range of 2.3 × 10–5 mol L−1 ~ 2.5 × 10–4 mol L−1, with a correlation coefficient of 0.98, clearly demonstrating the different behaviors of these isomers. Thus, the isomers were successfully distinguished. A mechanistic approach based on Furrow-Cervellati-Amadori (FCA) and Noyes-Field (NF) models was designed and justify the ceasing and regeneration of typical oscillations due to perturbation. Briefly, the intermediate species, HOO⋅ (hydroperoxyl radical), produced during the course of oscillatory reactions, oxidizes additives into their respective quinones. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 0021891X |
| DOI: | 10.1007/s10800-025-02317-x |
