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Study on the polarographic catalytic wave of the system cobalt(II)‐dimethylglyoxime
Author(s) -
YaMing Ni,
Ling Li,
Chun Zhou,
XiaoXia Gao
Publication year - 1987
Publication title -
acta chimica sinica english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 0256-7660
DOI - 10.1002/cjoc.19870050308
Subject(s) - dimethylglyoxime , chemistry , polarography , cobalt , catalysis , dropping mercury electrode , voltammetry , inorganic chemistry , cyclic voltammetry , adsorption , valence (chemistry) , linear sweep voltammetry , electrode , electrochemistry , organic chemistry
In the cobalt (II)‐dimethylglyoxime‐NH 3 ‐NH 4 Cl (pH 9) system, tne complex Co(II)A 2 exhibits a sensitive polarographic wave. The mechanism of this catalytic wave has been investigated by linear potential sweep voltammetry, cyclic voltammerty and anedic stripping voltammetry. The experimental evidences showed that a zero‐valence “active cobalt” or its complex formed during the irreversible reduction of Co(II)A 2 , which is adsorbed on the mercury electrode surface, and simultaneously DMG is catalytically reduced by this “active cobalt”. The mechanism of this system with the conflicting explanations of a catalytic hydrogen wave or only adsorptive complex wave is discussed.