Synthesis, Characterziation and SOD Activity of Manganese(II) Complexes with Aza-Macrocyclic Ligand

Abstract

Two manganese(II) complexes, [Mn2(L)(H2O)4]Cl2·6H2O(1) and [Mn2L(NCS)2(H2O)2]·3H2O(2) (L is 1,2,4-triazolato)-4,12,17,25-tetramethyl-1,2,5,8,11,14,15,18,21,24-decaza-4,11,17,24-cyclohexaeicosatetraene) have been prepared by template synthesis method. They are characterized by elemental analysis and IR. Single-crystal X-ray analysis reveals that complex (1) crystallizes in space group P 21/c with a = 8.710(3), b = 14.720(5), c = 14.301(5) A, α = 90, β = 105.801(14), γ = 90°. The complex [Mn2(L)(H2O)4]Cl2·6H2O consists of two manganese(II) macrocyclic complexes in which two Mn(II) centers are linked by two triazolate units of the macrocyclic framework. Each manganese(II) ion is coordinated by five nitrogen atoms from the macrocycle and two oxygen atoms of the coordinated water. The manganese(II) center is in an approximately pentagonal-bipyramidal environment. The SOD activities of both complexes have also been investigated. This paper reports the synthesis and characterziation two manganese(II) complexes with aza-macrocyclic ligand. Their SOD activities are also studied.