The influences of 13 axial organo-ligands------imidazole, pyridine, pyrazole, pyrazine, piperidine, 2-methylpyridine, 3-methylpyridine, 4- methylpyridine, 2,6-dimethylpyridine, pyrrole, furan, thiophene and Ph~3P on the biomimetic catalytic character of a Schiff base dimanganese complex in the monooxygenation of cyclohexane with PhIO were studied. The results show that all of these axial organo-ligands can increase the catalytic activity of the dimanganese complex, and the influences of the ligands on the catalytic character of the dimanganese complex increase with the increase of the value of pK~a of the ligands without steric effect.

Key words: SCHIFF BASE, MODELS OF ENZYME, CATALYTIC BEHAVIOUR, IMIDAZOLE P, PYRIDINE P, PYRAZINE P, PIPERIDINE P, TRIPHENYLPHOSPHINE, FURAN, PYRROLE