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Journal of Pharmaceutical and Applied Chemistry
An International Journal


Volumes > Vol. 5 > No. 2


Electrochemical Behavior of Benzene-Polycarmoxylic Acide with Different Number and Location of Containing Carboxylic Groups in Various Solvents

PP: 59-66
I. Gurgenidze, T. Chelidze, Sh. Japaridze, Sh. Japaridze, S. Shigardelashvili,
The purpose of the work is investigation of the influence of solvents water, ethanol and ethylene glycol nature on electrochemical behavior of nanoparticles of benzene-polycarboxylic acids with the different number and location of containing carboxyl groups: trimellitic acid (benzene-1,2,4-tricarboxylic acid), trimezintic acid (benzene-1,3,5- tricarboxylic acid), pyromelitic acid (benzene-1,2,4,5-tetracarboxylic acid), and mellitic acid with exactly six carboxylic groups (benzene-1,2,3,4,5,6-hexacarboxylic acid). The degree of adsorption of these acids was studied by the method of measuring the differential capacity of the double electrical layer depending on electrode potential. The determination of such as quality and as quantity of these acids in various solutions was carried out by polarographic method. On the base of experimental data were calculated the basic parameters characterizing behavior of nanoparticles at the mercury/solution interfaces. It was established that all the above mention acids have adsorption ability in double electrical layer, but in different degree. Namely, the values of parameters characterizing double electrical layer in the presence of benzene- polycarboxylic acids in various solutions are shown that mellitic acid has a greater adsorption capacity in ethanol solutions in comparison with aqueous solutions. It should be note that no acid shows adsorption ability in ethylene glycol solutions.

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