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Polarography of 5,5′-dithiobis- (2 nitrobenzoic acid)

✍ Scribed by D. Marín; J. Galvez

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
303 KB
Volume
25
Category
Article
ISSN
0013-4686

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✦ Synopsis

Polarography of 5,5'-dithio bis-(2 nitrobenzoic acid) in the pH range 2-12, in Britton-Robinson buffer at constant ionic strength (0 .5 M) has been carried out. Four cathodic waves (A, B, C and D) and an anodic wave have been obtained . Wave A is produced by a reduction of pre-protonated nitro groups . This wave has adsorption characteristics and precedes nitro groups' waves up to a pH 9 .0 . Wave B i s produced by a reduction of nitro groups and splitting of wave B into two waves are observed . At 45°C, nitro groups are reduced to the corresponding amine with an ECE mechanism at every pH value . At 20°C, nitro groups are reduced to the corresponding amine at pH > 6 .5 only. Wave C is produced by a reduction of the disulfide bond. This wave, at pH < 7 .8, is overlapped with the nitro groups wave . Wave D is ill-defined and appears at pH > 9 .0. An anodic wave is produced, due to thiolate which is formed from alkaline cleavage of the disulfide bond .

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