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Cobalt(II)-dibenzotetraaza[14]annulene complex electropolymerization for electrode modification

Abstract : Cobalt complexes of dibenzotetraaza[14]annulene (CoTAA), 5,7,12,14-tetramethyldibenzotetraaza[14]annulene (CoTMTAA), and dichlorodibenzotetraaza[14]annulene (CoTAACl2) have been studied by voltammetry in benzonitrile (BN). Their electropolymerization from solutions in BN was performed by oxidation at carbon and platinum electrodes. The Co(II)/Co(I) and Co(III)/Co(II) redox systems are clearly apparent on the voltammograms, as well as the electroactivity of the conducting polymer, when the electrode is in contact with the non-aqueous solvent. More surprising is the fact that the modification of electrode surfaces is also possible from the oxidation of aqueous acidic solutions of CoTAA and CoTAACl2 (2.25 M H2SO4). In contact with an acidic aqueous medium (0.5 M H2SO4), the Co(III)/Co(II) system of poly(CoTAA) is fully reversible. The polymer thus obtained can grow as a remarkably thick, dense and conducting phase. © 2000 Elsevier Science B.V.
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Submitted on : Thursday, April 19, 2018 - 2:49:10 PM
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C. Miry, D. Le Brun, J.-M. Kerbaol, M. L'Her. Cobalt(II)-dibenzotetraaza[14]annulene complex electropolymerization for electrode modification. Journal of Electroanalytical Chemistry, 2000, 494, pp.53--59. ⟨10.1016/S0022-0728(00)00321-1⟩. ⟨hal-01771380⟩



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