- 作者: S. K. Sharma
- 作者服務機構: Department of Chemistry, Birla Institute of Tech. and Sc. Pilani (Rajasthan) India
- 中文摘要: The —NO2 group reduction in 4-nitriphthalic acid (NPA) at dropping mercury electrode over a wide range of pH, is irreversible and diffusion controlled. Ill defined waves preceded the —NO2 group wave, were observed between pH 7 and 12 whereas at pH 5.0, a rounded maximum appears. The a. c. reduction of NPA at pH 12.0, provides two peaks, first peak corresponds to d. c. pre-step, is essentially due to adsorption phenomena whereas other peak is the reduction wave. Using McBain Down cell and King-cathcart equation the diffusion coefficient of NPA is 0.713×10¯3 cm2sec¯1. Six electrons are being involved in nitro group reduction and mechanism of the reduction was suggested. The kinetic parameters in absence and presence of ionic and non-ionic surfactants were determined. The reduction process becomes more and more irreversible as surface activity of organic compounds increases. Ionic surfactants are effective in increasing the value of —log K° than the non-ionic surfactants. The value of αna decreases regularly by the presence of compounds having regular increase of surface activity.
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