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Abstract
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Aniline and phenylacetylene and their derivatives are important compounds in chemical industries. P-ethynylaniline has the amino and ethynyl substituents which classified as the electron-donating group [1]. Due to the stability, simple and effective preparation, easy to control over surface coverage and density, aromatic diazonium salts has been used to functionalize solid interface. This approach, popularly known as electrografting, uses diazonium salts that are electrochemically reduced in order to generate reactive radicals. These radicals enable covalent binding to the electrode surface [2, 3]. Diazonium salts are highly useful intermediates in the synthesis of a large variety of aromatic compounds. These can be used to prepare many classes of organic compounds. Aryl azo compounds are brightly coloured and are useful as dyes and pigments so are classified as azo dyes. In this work we study the electrochemical behaviour of 4-ethynylaniline, using cyclic voltammetry and coloumetery at controlled potential technique at the surface of glassy carbon at various scan rate and pH. Electrochemical behavior of 4-ethynylaniline was studied in acetonitrile at the different scan rate. The results revealed that it had an irreversible redox reaction. The diazo compound was synthesis by oxidation of 4-ethynylanilin at the specific pH in the divided cell using controlled potentials coloumetery.
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