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Adsorptive‐catalytic stripping voltammetry‐enhanced reduction current of adsorbed Co II tetraaza[14]annulene complex in the presence of CO 2
Author(s) -
Muszalska Elżbieta,
Bilewicz Renata
Publication year - 1996
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.1140080215
Subject(s) - chemistry , adsorption , monolayer , catalysis , annulene , cyclic voltammetry , inorganic chemistry , electrode , dropping mercury electrode , cobalt , protonation , voltammetry , aqueous solution , selective catalytic reduction , stripping (fiber) , electrochemistry , photochemistry , stereochemistry , organic chemistry , materials science , ion , biochemistry , composite material
The macrocyclic cobalt(II) complex CoL (LH 2 = 5,14dihydrodibenzo[b,i][1,4,8,11] tetraaza[l4]annulene) can be adsorptively preaccumulated on mercury electrodes from highly diluted aqueous solutions. The adsorbed Co II complex undergoes one‐electron reduction with subsequent protonation of [CoL] − to CoLH, also adsorbed on mercury. The electrode covered with adsorbed complex may be used to detect CO 2 , since upon substitution of argon by CO 2 a large catalytic peak is observed at the potentials of CoLH complex reduction. At constant CO 2 concentration, the peak first increases proportionally to the extent of coverage of the electrode with the adsorbed complex and then becomes constant when monolayer coverage is attained. At a monolayer covered electrode the catalytic reduction signal increases proportionally to the increase of CO 2 concentration. The usefulness of the normal pulse voltammetry version of the adsorptive‐catalytic stripping procedure is also shown.