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ChemInform Abstract In acidic buffered aqueous solution the complex (Ia) exhibits both catalase-and peroxidase-like activity. The predominant cation in this solution at pH 4.65 is (Ib), a realistic model for the enzymatic processes. The selectivity of its reactions is due to the formation of a complex ion intermediate in a high oxidation state rather than through the previously assumed free hydroxyl radicals. An X-ray investigation of (Ia) (space group Pnma, Z=4) indicates a folded conformation of the macrocycle. This stereochemistry is retained in solution and may allow bidentate coordination of H2O2, a structural feature that may be critical to the catalase-and peroxidase-like activity.

Der Titelkomplex (I) ist ein wirksamer Katalysator bei der Zers. von H2O2 in wäßriger Lösung unter Bildung von H2O und O2.