ISSN:
1040-0397
Keywords:
Adsorptive-catalytic stripping voltammetry
;
Carbon dioxide
;
Cobalt tetraaza[14] annulene
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The macrocyclic cobalt(II) complex CoL (LH2 = 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 CoII 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 CO2, since upon substitution of argon by CO2 a large catalytic peak is observed at the potentials of CoLH complex reduction. At constant CO2 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 CO2 concentration. The usefulness of the normal pulse voltammetry version of the adsorptive-catalytic stripping procedure is also shown.
Additional Material:
11 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140080215
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