The Polarographic Behaviour of 2,4-Dinitrophenol in Aqueous and non Aqueous Methanolic Media

✍ Scribed by Fouad Taha; H. A. El Shayeb; A. A. Abd El Gaber; A. M. El Roudi

• Publisher: Wiley (John Wiley & Sons)
• Year: 2010
• Weight: 486 KB
• Volume: 95
• Category: Article
• ISSN: 0037-9646
• DOI: 10.1002/bscb.19860950402

✦ Synopsis

2. 4-Dinitrophenol (DNP) is polarographically reduced in aqueous buffered solutions along

The height of the first-wave is two or three diffusion-controlled waves depending on the pH. practically independent of pH. hydroxylamine stage. steps which manifest the presence of bonded and non bonded states, hence the reduction of DNP is stopped with the formation of two different intermediates.

DNP in non aqueous methanolic media is reduced along three irreversible waves due to the dissociated and anionic forms of the depolarizer. The addition of proton donors causes the reduction of DNP to form the diamine product when 12 equivalents of acid/equivalent depolarizer are present. ted.

influence the reduction waves in two distinct ways. tion process are discussed.

Each of the two nitro-groups is reduced independently to the Within the pH range 4.6 -9.1 the reduction process exhibits only two

In the presence of one mole of alkali, the first wave is completely elimina-The effect of surfactants on the electroreduction waves of DNP was examined. Additives

The kinetics and mechanism of the reduc-