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Sökning: WFRF:(Shi YG)

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  • Shi, W, et al. (författare)
  • Synthesis and characterization of a six-coordinate monomeric Mn(III) complex with SOD-like activity
  • 2006
  • Ingår i: Journal of Coordination Chemistry. - : Informa UK Limited. - 1026-7441 .- 0095-8972 .- 1029-0389. ; 59:2, s. 119-130
  • Tidskriftsartikel (refereegranskat)abstract
    • The complex [Mn-III(HL)(L)(py)(CH3OH)](CH3OH)-C-. (H2L=2-ortho-hydroxyphenylbenzimidazole, py pyridine), 1, has been characterized spectroscopically and by X-ray crystallography. The complex is triclinic, space group P-1(-) with a = 10.396(2), b = 10.7340(10), c = 15.193(2) angstrom, alpha = 73.193(4)degrees, beta = 76.283(8)degrees, gamma = 61.400(40)degrees, V = 1415.1(4)angstrom(3), Z = 2, D-c = 1.445 Mg m(-3), M-r = 615.56, mu = 0.515 mm(-1), F(000) = 640, R = 0.0631, wR = 0.1525. Manganese is six-coordinate in an N3O3 ligand sphere created by two bidentate H2L ligands and solvent molecules with a slightly distorted, axially elongated octahedral geometry. Electronic absorption spectra show pi-pi* and Ligand Metal Charge Transfer (LMCT) transitions in the UV region and d-d transitions in the visible region. Solvent molecules coordinated to the Mn(III) ion in the crystal are thought to retain their coordination in solution. It is shown that 1 has reaction activity with the superoxide ion, as indicated by inhibition of pyrogallol autoxidation and by spin trapping electron paramagnetic resonance (EPR) spectroscopy. The N3O3 ligand set in 1 is similar to that in native MnSOD (superoxide dismutatase) in the substrate-bound state. The correlation between the ligand set in 1 and its reaction with the superoxide ion is discussed.
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