tIn this work the syntheses, structure, superoxide dismutase (SOD) activity and the catalytic use in theoxidative transformations of cyclohexene of covalently grafted Mn(II)-complexes formed with variousC-protected amino acid (l-histidine, l-cysteine and l-cystine) ligands are presented. The structural features of the surface complexes were studied by EPR, X-ray absorption, and mid/far IR spectroscopies. The superoxide dismutase activities of the materials were determined in a biochemical test reaction. The obtained materials were used as catalysts for the oxidation of cyclohexene with peracetic acid inacetone. Covalent grafting and building the complex onto the surface of the chloropropylated silica gelwere successful in all cases. It was found that in many instances the structures obtained and the coor-dinating groups substantially varied upon changing the conditions of the syntheses. All the covalently immobilised Mn(II)-complexes displayed superoxide dismutase activity and could catalyse the oxidationof cyclohexene.
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