Abstract <p>The orcinol negative effect has continued to attract interest, as United Nations sustainability development goal 3 is concerned. The substance belongs to a class of compound that causes eye and skin discomfort and high possibility of cancer. Hence, its Cu(II)-assisted oxidation with periodate ion <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\text{IO}}_{4}^{ - }\)</EquationSource> <!--PhysChB2570173Nkole-m1--> </InlineEquation> and exploration of micellar impact on the process. The studied kinetic parameters reveal a first-order reaction with respect to the concentration of orcinol and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({\text{IO}}_{4}^{ - }\)</EquationSource> <!--PhysChB2570173Nkole-m2--> </InlineEquation> and a one-to-two stoichiometric mole ratio [orcinol] : [<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({\text{IO}}_{4}^{ - }\)</EquationSource> <!--PhysChB2570173Nkole-m3--> </InlineEquation>]. The population of electrolyte concentration leads to neither increase nor decrease in the oxidation rate and acid concentration increase result in rate enhancement, whereas the aggregation of cetyltrimethylammonium bromide monomers hastens the oxidation rate. The critical micelle concentration of cetyltrimethylammonium bromide was validated with conductometric and zeta potential inputs. The binding affinity of the substrate with the micelles is strengthened by Piszkiewicz’s model. The evidence of free radicals and intermediate species are positive and transient, respectively. However, total breakdown of orcinol to pyruvate, acetic acid, and carbonic acid in a green reaction system is sustainable and efficient for greater accessibility of a clean environment. The non-spontaneity of the process is supported by the thermodynamic parameters (<InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\Delta H{\kern 1pt} ^* = {\;} + 37.38{\text{ kJ mo}}{{{\text{l}}}^{{ - 1}}},{{\;\;}}\Delta G{\kern 1pt} ^* = {\;} + 73.12{\text{ kJ mo}}{{{\text{l}}}^{{ - 1}}},{\text{ and}}\,\,\Delta S{\kern 1pt} ^* = {\;} - 119.14{\text{ J }}{{{\text{K}}}^{{ - 1}}}{\text{mo}}{{{\text{l}}}^{{ - 1}}}\)</EquationSource> <!--PhysChB2570173Nkole-m4--> </InlineEquation>).</p>

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Copper(II)-Assisted Orcinol Oxidation with Periodate Ion: Micellar and Kinetic Study

  • I. U. Nkole,
  • A. Srivastava,
  • P. Sar,
  • I. B. Onyeachu,
  • S. O. Idris

摘要

Abstract

The orcinol negative effect has continued to attract interest, as United Nations sustainability development goal 3 is concerned. The substance belongs to a class of compound that causes eye and skin discomfort and high possibility of cancer. Hence, its Cu(II)-assisted oxidation with periodate ion \({\text{IO}}_{4}^{ - }\) and exploration of micellar impact on the process. The studied kinetic parameters reveal a first-order reaction with respect to the concentration of orcinol and \({\text{IO}}_{4}^{ - }\) and a one-to-two stoichiometric mole ratio [orcinol] : [ \({\text{IO}}_{4}^{ - }\) ]. The population of electrolyte concentration leads to neither increase nor decrease in the oxidation rate and acid concentration increase result in rate enhancement, whereas the aggregation of cetyltrimethylammonium bromide monomers hastens the oxidation rate. The critical micelle concentration of cetyltrimethylammonium bromide was validated with conductometric and zeta potential inputs. The binding affinity of the substrate with the micelles is strengthened by Piszkiewicz’s model. The evidence of free radicals and intermediate species are positive and transient, respectively. However, total breakdown of orcinol to pyruvate, acetic acid, and carbonic acid in a green reaction system is sustainable and efficient for greater accessibility of a clean environment. The non-spontaneity of the process is supported by the thermodynamic parameters ( \(\Delta H{\kern 1pt} ^* = {\;} + 37.38{\text{ kJ mo}}{{{\text{l}}}^{{ - 1}}},{{\;\;}}\Delta G{\kern 1pt} ^* = {\;} + 73.12{\text{ kJ mo}}{{{\text{l}}}^{{ - 1}}},{\text{ and}}\,\,\Delta S{\kern 1pt} ^* = {\;} - 119.14{\text{ J }}{{{\text{K}}}^{{ - 1}}}{\text{mo}}{{{\text{l}}}^{{ - 1}}}\) ).