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Novel dinuclear manganese(III) complexes, MnIII2(N-PhO-sal)2(X-sal-m-xylylene) (X = H, 3-MeO) have been prepared by the ligand substitution reaction and characterized, where N-PhOH-salH and X-sal-m-xylyleneH2 denote N-2-hydroxyphenylsalicylideneamine and N,N′-di-substituted-salicylidene-m-xylylenediamine, respectively. These complexes have been found to decompose hydrogen peroxide catalytically (H2O2 /Mn < 100), cycling their oxidation levels between Mn2 (III,III) and Mn2 (II,II) with dioxygen evolution.

Novel mono- and trinuclear iron(III) complexes with mixed ligands, FeIII(acac)(N-PhO-sal)(MeOH) 1 and FeIII3(acac)(N-PhO-sal)4  2 have been prepared and characterized, where acacH and N-PhOH-salH denote acetylacetone and N-2-hydroxyphenyl-salicylideneamine, respectively. The variable temperature magnetic susceptibilities (2-350 K) for complex 2 indicate that there is an intramolecular antiferromagnetic interaction among the iron(III) ions, and that spin-crossover behavior may take place from S = 5/2, 5/2 and 5/2 ground states to S = 1/2, 5/2 and 1/2 (Fe1, Fe2 and Fe1*) near 60 K and below.

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