Synthesis and Crystal Structure of a Spiral-chain Manganese(Ⅲ) Complex Containing Azide Bridge,[Mn(bzan)N_3]_n

1 INTRODUCTION It is now recognized that manganese plays an important role in numerous redox processes associating with the metabolism of dioxygen. This has prompted recent attempts to understand the coordination chemistry of Mn(Ⅲ) ions which are now believed to play a role in at least three enzymes: manganese superoxide dismutase (MnSOD)1], manganese catalase2] and photosynthetic oxygen- evolving complexes (OEC)3]. New model complexes have appeared during the last ten years. Her…

Synthesis and Crystal Structure of a Spiral-chain Manganese(Ⅲ) Complex Containing Azide Bridge, [Mn(bzan)N3]n

The title complex, C22H22MnN5O2, crystallizes in orthorhombic system, space group P212121 with a = 6.887(1), b = 11.718(2), c = 25.721(5) (A。）, V = 2075.7(7) (A。）3, Z = 4, Mr = 443.39, F(000) = 920, Dc = 1.419 g/cm3 and ( = 0.665mm(1 (MoK(). The structure was refined to R = 0.0593 and wR = 0.1427 for 3576 observed reflections with I ≥ 2((I). The Mn(Ⅲ) atom is coordinated to one bzan2-bzan2- = N，N-ethylenebis(benzoylacetoneiminato)] ligand binding in the equatorial mode and two N3- ions in the axial positions. The azide acts as a trans-μ-(1, 3) bridge, resulting in an infinite helical chain propagating along the b axis.