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Electrochemical behavior and determination of quinolinium and isoquinolinium oximes
Author(s) -
KarljikovićRajić K.,
Jovanović M.,
Korićanac Z.,
Stanković B.,
Minić D.
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.1140030211
Subject(s) - polarography , electrochemistry , chemistry , cyclic voltammetry , amine gas treating , chloride , diffusion , differential pulse voltammetry , oxime , inorganic chemistry , analytical chemistry (journal) , medicinal chemistry , electrode , organic chemistry , thermodynamics , physics
The electrochemical behavior of 1‐(2‐phenyl‐2‐hydroxyiminoethyl)‐1‐quinolinium chloride (F‐1) and 1‐(2‐phenyl‐2‐hydroxyiminoethyl)‐1‐isoquinolinium chloride (F‐2) was investigated using dc and differential pulse polarography (DPP) and cyclic voltammetry. Well‐defined, diffusion‐controlled, cathodic waves were observed for F‐1 only in strong acidic solution (pH 1.25 HCl) and for F‐2 in the H range 1.25–5.33 (HCl and Britton–Robinson buffer). The overall reduction of the azomethine group to a primary amine, a process that involves the uptake of four electrons, is irreversible. For both oximes a mechanism of reduction has been proposed. The rapid and accurate determination of these quinolinium and isoquinolinium oximes is possible by dc polarography and by DPP. Limits of detection are 5 × 10 −7 M for both oximes using DPP.