... Abstract The influence of a charge sign of the substituents in phthalocyanines with the common formula R + 8 PcM and R - 8 PcM on their catalytic activity in ascorbic acid oxidation by dioxygen was investigated. On the example of complexes Fe and Co it was shown that the change of the charge sign of the substituents from negative to positive one results in increase of phthalocyanines catalytic activity on the order of magnitude. ... Moscow University Chemistry Bulletin . 2002, Vol. ...