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Vol.5 , No. 1, Publication Date: Feb. 1, 2018, Page: 8-16
, different electrodes (Pt, Au, GC) were studied by using cyclic voltammetry, controlled potential Coulometry and differential pulse voltammetry. Electro-oxidation of 1,2-dihydroxy benzene generates o-benzoquinone which acts as Michael acceptor. L-Valine acts as a nucleophile and undergoes 1,4-Michael addition reaction with 1,2-dihydroxy benzene. The reaction of o-benzoquinone with L-Valine at moderately high concentration of nucleophiles was observed in second scan of potential. After occurring electro-oxidation the product is assumed to be 2-((3,4-dioxocyclohexa-1,5-dien-1-yl)amino)-3-methylbutanoic acid that undergoes electron transfer at more negative potentials than the 1,2-dihydroxy benzene. The reaction was strongly influenced by pH as well as concentration of L-Valine. The concentration effect of nucleophile with fixed concentration of 1,2-dihydroxy benzene (2 mM) was measured from 30 mM to 200 mM. This nucleophilic addition reaction was most suitable in 100 mM of L-Valine and 2 mM of 1,2-dihydroxy benzene at pH 7. The behavior of the reaction was of ECE type followed by diffusion mechanism.&picture=http://www.aascit.org/aascit/decorators/img/journal/905.jpg)
| [1] | Firoz Ahmed, Department of Chemistry, Khulna University of Engineering and Technology, Khulna, Bangladesh. |
| [2] | Nazim Uddin, Department of Chemistry, Khulna University of Engineering and Technology, Khulna, Bangladesh. |
| [3] | Abdul Aziz, Department of Chemistry, Khulna University of Engineering and Technology, Khulna, Bangladesh. |
| [4] | Abdul Motin, Department of Chemistry, Khulna University of Engineering and Technology, Khulna, Bangladesh. |
| [5] | Abdul Hafiz Mia, Department of Chemistry, Khulna University of Engineering and Technology, Khulna, Bangladesh. |
The electrochemical behavior of 1,2-dihydroxy benzene in presence of different concentration of L-Valine in aqueous solution with various pH values (5-11), different electrodes (Pt, Au, GC) were studied by using cyclic voltammetry, controlled potential Coulometry and differential pulse voltammetry. Electro-oxidation of 1,2-dihydroxy benzene generates o-benzoquinone which acts as Michael acceptor. L-Valine acts as a nucleophile and undergoes 1,4-Michael addition reaction with 1,2-dihydroxy benzene. The reaction of o-benzoquinone with L-Valine at moderately high concentration of nucleophiles was observed in second scan of potential. After occurring electro-oxidation the product is assumed to be 2-((3,4-dioxocyclohexa-1,5-dien-1-yl)amino)-3-methylbutanoic acid that undergoes electron transfer at more negative potentials than the 1,2-dihydroxy benzene. The reaction was strongly influenced by pH as well as concentration of L-Valine. The concentration effect of nucleophile with fixed concentration of 1,2-dihydroxy benzene (2 mM) was measured from 30 mM to 200 mM. This nucleophilic addition reaction was most suitable in 100 mM of L-Valine and 2 mM of 1,2-dihydroxy benzene at pH 7. The behavior of the reaction was of ECE type followed by diffusion mechanism.
Keywords
Cyclic Voltammetry, Differential Pulse Voltammetry, 1,2-Dihydroxy Benzene, L-Valine, ECE Mechanism
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