Determination of p-Dimethylaminobenzaldehyde by Using a Briggs–Rauscher Electrochemical Oscillator

W. Uddin W. Uddin , M. Y. Nawabi M. Y. Nawabi , S. Ur. Rehman S. Ur. Rehman , G. Hu G. Hu , J. Khan J. Khan , X. Shen X. Shen
Российский электрохимический журнал
Abstract / Full Text

We introduced a novel technique for monitoring the activity of analytes for the first time. The technique is built upon the inhibitory effect caused by the free-radical-scavengers on the pattern of novel Briggs–Rauscher (BR) electrochemical oscillator catalyzed by tetra-aza-macrocyclic complex catalyst ([NiL](ClO4)2. The ligand “L” in the complex is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. The effect involves a sudden ceasing of oscillation, an inhibition time (tin) that directly proportional to the amount of additive (p-Dimethylaminobenzaldehyde (p-DMAB)) added, and subsequent restoration of oscillations. Thus, a linear regression curve between concentrations range of 2.7 × 10–7 mol L–1 to 4.5 × 10–6 mol L–1 p-DMAB Vs tin was achieved with a correlation coefficient of 0.98. The observed limit of detection (LOD) is 2.7 × 10–7 mol L–1 while the RSD calculated from 7 measurements of 2.5 × 10–6 mol L–1 p-DMAB is 1.5%. Factors that influence the determination of p-DMAB were also studied. The mechanistic interpretation of the perturbed oscillation was anticipated from both NF and FCA models. A fleeting elucidation is that the intermediate species (HOO) produced during oscillatory reactions and reacted with p‑DMAB. As a result, the oscillation was temporarily ceased.

Author information
  • School of Chemistry and Chemical Engineering, Anhui University, Hefei, China

    W. Uddin, M. Y. Nawabi, G. Hu & X. Shen

  • Office of Research Innovation and Commercialization (ORIC), Bahria University, Karachi Campus, Pakistan

    W. Uddin

  • College of Physics and Optoelectronic Engineering, Shenzhen University, Nanhai Ave. 3688, Shenzhen, Guangdong, P. R. China

    S. Ur. Rehman

  • Department of Physics, Khushal Khan Khattak University, Karak, Pakistan

    J. Khan

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