Abstract

The water substitution reactions of the monocation Co(III)(H 2O) 2(salen) + [salen = N,N′-ethylene-bis(salicylideneiminate)] were studied in aqueous solution. The nucleophiles used were pyridine, thiourea, morpholine, aniline, imidazole, NCO −, HSO 3 −, S 2O 3 2−. The kinetics of mono-substitution reactions were found to be very rapid, with second order rate constants nearly independent of the nature of the incoming ligand. A comparison is made with the corresponding reactions of Co(III)hematoporphyrin and some other macrocyclic complexes.

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