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Adsorption and electrochemical transformations of diphenylcarbazide and diphenylcarbazone on graphite electrodes
Author(s) -
Malakhova Natalia A.,
Chernysheva Albina V.,
Brainina Khiena Z.
Publication year - 1991
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140030716
Subject(s) - chemistry , tetrazole , adsorption , reagent , electrochemistry , enol , inorganic chemistry , electrode , graphite , radical , organic chemistry , catalysis
Potential dependences of the Current and differential double‐layer capacity were used to investigate the processes that take place on a graphite electrode in acidic media containing 1, 5‐diphenylcarbazide (DPCI) and 1, 5‐diphenylcarbazide (DPCO). It is shown that adsorption of the enol form of these compounds on the electrode surface is observed over the potential range of +0.2 to −1.0 V. Over the range of +0.2 to +0.4 V, the adsorbed enol form of the reagents is oxidized, involving formation of radicals to tetrazole salts, which are reduced irreversibly to the starting reagents at a potential lower than −0.2 V. The keto form of diphenylcarbazide is oxidized, omitting the adsorption stage. As the keto form of diphenylcarbazide is oxidized, an uncharged compound (probably a radical or a biradical) is formed.