Syntheses, Crystal Structures, Superoxide Dismutase-Like Behaviors and Physical Properties of Four Manganese(III) Complexes with Di-Schiff Bases Derived from Salicylaldehyde and Polyamines

Abstract

Four manganese(III) complexes, [Mn(salMeDPT)(O 2 CMe)] 1 , [Mn(salMeDPT)Cl]·MeCN 2 , [Mn(salEDPA)] Cl 3 and [Mn(salEDPA)](MeCO 2 ) 4 have been prepared, where the di-Schiff-base salMeDPT and salEDPA were from the (2 + 1) condensation of salicylaldehyde with 4-methyl-4-azaheptane-1,7-diamine and with 4,7-diazadecane-1,10-diamine, respectively. The four complexes have been characterized by elemental analyses and cyclic voltammetry, while complexes 1 - 3 have also been characterized by single-crystal x-ray diffraction, which reveals all the Mn(III) atoms in these complexes adopt slightly compressed octahedra with the Mn-O and Mn-N bond lengths in ranges 1.882(3)-1.890(3) and 2.021(4)-0.546(4) Å, respectively. The results of activity assay indicate that complexes 1 - 4 have moderate superoxide dismutase activities.