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Abstract
A new five-coordinate manganese(II) complex Mn(NTB)(C 8H 4O 4)·DMF·0.5CH 3OH·0.5H 2O, where NTB is tris(2-benzimidazolyl-methyl) amine and C 8H 4O 4 2− is the dianion of terephthalic acid, was prepared and characterized by X-ray crystallography. It crystallizes in the tetragonal system, space group l4 1/ a with a = 28.063(1), c = 22.8680(1) A ̊ , Z = 16 and V = 18009(9) A ̊ 3 . The structure was solved by direct methods and refined by full-matrix least-squares(on F) to residual R( wR) values of 0.0785 (0.076). The manganese in the complex adopts a distorted trigonal-bipyramidal coordination geometry with an N 4O ligand donor set and bears structural similarities to the active site of Mn-superoxide dismutase. The X-band electron paramagnetic resonance spectrum of the complex exhibits a six-line manganese hyperfine pattern with g = 2.005, A = 94 G. The electrochemical properties of the complex were studied in DMF by cyclic voltammetry. The complex can catalyse the dismutation of superoxide (O 2 −) effectively in the riboflavin-methionine-nitro blue tetrazolium assay.
Published Version
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