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The Study of Redox Reaction of Gallic Acid with Bis-(2-Pyridinealdoximato)dioxomolybdate(IV) Complex in an Aqueous Acidic Medium

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Abstract

The study of redox reaction of gallic acid (GA) with bis-(2-pyridinealdoximato)dioxomolybdate(IV), [MoIVO2(paoH)2]2− in an aqueous acidic medium was investigated spectrophotometrically at 304 K. The reaction exhibited a 2:1 stoichiometry (Complex: GA) with the active participation of a reactive free radical species in the reductive process. The order of the reaction is first order in the concentration of both reactants. The variation of the salt concentration in the reaction mixture demonstrated a positive salt effect which is reinforced by the deceleration in the reaction rate as the medium relative permittivity (water/ethanol) is decreased due to the same charge of the reacting species at the rate-limiting step. The interaction of the same charge species was possible due to the deprotonation of GA at the prior equilibrium step. The effect of counter-ions (NH4+ and SO42−) on the reaction rate was obvious with a catalytic and inhibitory trait from the NH4+ and SO42− ions, respectively. The thermodynamic features of the reaction revealed a reaction with energized and activated complexes in the transition state. The participation of a firm intermediate complex was negative as portrayed by the spectroscopic scanning technique and Michaelis Menten’s type plot which rules out the dominance of the inner-sphere mechanistic route in the reaction and is suggestive of the outer-sphere mechanistic route.

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Authors and Affiliations

  1. Department of Chemistry, Ahmadu Bello University, Zaria, Nigeria

    I. U. Nkole, S. O. Idris & I. Abdulkadir

  2. Department of Chemistry, Federal College of Education, Zaria, Nigeria

    A. D. Onu

Authors
  1. I. U. Nkole
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  2. S. O. Idris
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  3. I. Abdulkadir
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  4. A. D. Onu
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Correspondence to I. U. Nkole.

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Nkole, I.U., Idris, S.O., Abdulkadir, I. et al. The Study of Redox Reaction of Gallic Acid with Bis-(2-Pyridinealdoximato)dioxomolybdate(IV) Complex in an Aqueous Acidic Medium. Chemistry Africa 5, 525–532 (2022). https://doi.org/10.1007/s42250-022-00346-z

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  • DOI: https://doi.org/10.1007/s42250-022-00346-z

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