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• W1991237580 abstract "New paramagnetic Fe(II) and Mn(II) complexes with the divalent hemiporphyrazine (hpH2) were isolated and characterized. Their formula are Mhp, MhpH2O, MhpHCl, Mhp(HCl)2 and Fehp(γ-pic)2. Of these, the HCl derivatives are true adducts of divalent metal complexes. The H2O and HCl derivatives were found to be thermally very stable. This arises, in addition to the coordination of oxygen or halogen to the metal, from an interaction between the protons of the coordinated molecules and the nearby nitrogen atoms of the macrocycles. A general tendency of the complexes to coordinate axially to give high spin derivatives is observed with this ligand. Fehp(γ-pic)2 gives a magnetic moment of 4.0 μB, suggesting the presence of an intermediate spin state. This is attributed to the weak and asymmetric ligand field of the macrocycle. The reactivity of the complexes in the solid state and in solution was examined. Solutions of Fe(II) complexes were found to react with oxygen. It was determined spectroscopically that the reaction with O2 is not reversible. Under anaerobic conditions, however, the oxidized species present in solution reacts back to the initial Fe(II) sppecies. The addition of Ph3P increases the velocity of the back-reaction." @default.
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• W1991237580 date "1985-03-01" @default.
• W1991237580 modified "2023-09-26" @default.
• W1991237580 title "Synthesis and reactivity of some Fe(II) and Mn(II) complexes with hemiporphyrazine" @default.
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• W1991237580 doi "https://doi.org/10.1016/s0020-1693(00)90743-6" @default.
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