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Cyclic voltammetry of aromatic amines in aqueous and non-aqueous media

✍ Scribed by L.R. Sharma; A.K. Manchanda; G. Singh; Ranjit S. Verma


Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
978 KB
Volume
27
Category
Article
ISSN
0013-4686

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✦ Synopsis


Cyclic wltammetry of some typical aromatic amines has been studied using the tubukr graphite electrode in aquxxxts medium and a phnc graphite electrode in non4qucous mc4tium. AU aromatic tima, kqazztive of the nature of the & undergo anodii oxidation through the formationofa monocation mdicsk In aqueuus medim the monocation radical under-tsrough its -stluct~ dimcrktion involving tail-to-tai& had-tf#-tail and even head-to-head coupling. The product8 formed, being more easily oxidisabk than the pnxcnt rubstance, undergo further oxidation at the same potential so tit the overall oxidation involvE6 a 0 w. [k a single wave), two-electron process. The iV-&yl aniliw however, oxidiseirltwostepminsteadofone. or due to the fad that the ekctron-nkasing alkyl &roups +ttachcd to nitrogen disprrac the positive charge on tbc ation radical and thus render it stable. The stnbilised proportion af the ation radicai um fiuther oxidation at a higher potential forming a dilation. This ~eobur~ts for the form&a of the second wave. In non-aqueous medium, the monocation radical does not undergo d*tion through coupling reactions. Retsining its identity, it undergoes further oxidation at a higher potential forming a dicstion. Thus. in non-squeeua medium, aromatic amines oxidi~ in two steps involving one electron in each step. The dication rsdic~! formed in aqueous or non-aqueous medium combines with a neutral molecule formin g hydrazobenzene or its analogue as an intermediate product, the tinal product being szobenxent or its analogue.


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