Several heterogeneous catalysts consisting of peripherally substituted cobalt phthalocyanine complexes covalently linked to the synthetic carbons modified by organic aminogroups have been prepared and tested in the catalytic reaction of the autoxidation of dodecane-1-thiol in organic solvents. It has been shown that, in general, the catalytic activity of covalently linked cobalt phthalocyanine sulfonamides is higher as compared to the respective cobalt phthalocyanine sulfonic acids. An influence of the length of the linker and surface concentration of the phthalocyanine complexes on the catalytic activity of a given catalyst has also been discussed. (c) 2006 Elsevier B.V. All rights reserved.