Characterization and catalytic property of manganese(III) complexes with Schiff bases

Two mononuclear manganese(III) complexes, [MnL1(OH2)(CH3OH)]center dot ClO4 (1) and [MnL2] (2), where L-1 and L-2 are the deprotonated forms of N,N'-bis(5-chloro-2-hydroxybenzylidene)ethane-1,2-diamine and tris{2-[(3,5-dichlorosalicylidene)amino]ethyl}amine, respectively, are obtained by the reaction of Schiff bases with manganese perchlorate in methanol. The complexes were characterized by elemental analysis, IR spectra, and single crystal X-ray determination. In both complexes, Mn atoms are in the octahedral coordination. In the crystal structure of complex 1, the complex molecules are linked by water ligands through intermolecular O-Ha <-O hydrogen bonds to form dimers. The perchlorate anions are linked to the complex molecules through intermolecular O-Ha <-O hydrogen bonds. In the crystal structure of complex 2, the molecules are stacked along the y axis through pi a <-pi interactions. The catalytic oxidation on olefins of the complexes is studied.