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Cationic Surfactant-Based Catalysis on the Oxidation of Glutamic Acid by Bis-(2-pyridinealdoximato)dioxomolydate(IV) Complex

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Abstract

A spectrophotometric routine was used to study the cationic surfactant-based catalysis on the oxidation of glutamic acid (GTA) by bis-(2-pyridinealdoximato)dioxomolybdate(IV) complex at 302 K and an absorption maxima of 560 nm. It follows an acid independent oxidative pathway that is medium-sensitive. Charge density from the reaction species contributes to the redox acceleration, resulting in an upturned primary salt effect with an enhanced reaction rate. Modifying reaction medium with ethanol led to a rise in the oxidation time as the charge catalysis was unsupported by a drop in the system permittivity. Likewise, the inclusion of cetyltrimethylammonium bromide in the system increased the oxidation rate of the GTA due to the high impact of hydrophobic and ion interaction between the micelle and substrates. First order reaction kinetics was observed in the redox partners’ concentration. A 1:1 (complex:GTA) stoichiometry was obtained with the involvement of aldehyde succinic radical, resulting in succinic acid and a Mo2+ deactivated complex. The occurrence of counterion catalysis is pronounced in the reaction system. The standard enthalpy (24.98 \(\pm\) 0.03 kJ mol−1) and Gibbs energy (79.32 \(\pm\) 0.05 kJ mol−1) suggest that the process is energy demanding. The investigation of surfactant-based catalysis in the reaction system was quantitatively ascertained from the Piszkiewicz model of the complex interaction sequence.

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Scheme 1
Scheme 2

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Data Availability

The data available on request from the authors.

Abbreviations

CTAB:

Cetyltrimethylammonium bromide

NBP:

N-bromophthalimide

BAB:

N-bromobenzenesulphonamide

GTA:

Glutamic acid

SC:

Conductivity

TX-100:

Triton X-100

FTIR:

Fourier transform infrared spectrophotometer

BDH:

British drug house

D:

Medium permittivity

µ:

Salt concentration

kobd :

Observed rate constant

k2 :

Second order rate constant

CMC:

Critical micellisation concentration

A/Abs:

Absorbance

T:

Temperature

K:

Equilibrium constant

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Acknowledgements

Department of Chemistry, Ahmadu Bello University Zaria

Funding

The research did not receive grant from any organization or institution.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Physical Sciences, Ahmadu Bello University, Zaria, Nigeria

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

  2. Department of Chemistry, Faculty of Sciences, 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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Contributions

IUN, SOI, and IA: conceived and design the study. ADO, IUN, and SOI: collected and analyzed the data. IUN, SOI, IA, and ADO: drafted the manuscript, revised the manuscript critically for important intellectual content. All authors read and approved the final manuscript.

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Correspondence to I. U. Nkole.

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Nkole, I.U., Idris, S.O., Abdulkadir, I. et al. Cationic Surfactant-Based Catalysis on the Oxidation of Glutamic Acid by Bis-(2-pyridinealdoximato)dioxomolydate(IV) Complex. Catal Lett 153, 3581–3590 (2023). https://doi.org/10.1007/s10562-022-04187-w

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  • DOI: https://doi.org/10.1007/s10562-022-04187-w

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