The hydroxyparaquinone complex bis(phthiocolato)bis(pyridine)manganese(ii) has been synthesized and characterized spectrally and by X-ray crystallography.Quinone complexes of manganese have proved to be of considerable interest for their ability to undergo intramolecular metal-ligand electron transfer.1 Photolysis of solutions containing Mn2(CO)lo and 3,5-di-t-butyl-1 ,Zbenzoquinone (dbsq) produced the green bis(3,5-di-t-butylsemiquinone)manganese(n) tetramer, [Mn(db~q)~]~.2 Treatment of the tetramer with pyridine (py) resulted in formation of the monomeric bis(pyridine) adduct.1 In the solid state this complex containins MnIV chelated by quinone ligands in the di-t-butylcatecholate (dbcat) form, Mn*v(py)2(dbcat)2. However, in toluene solution at room temperature purple crystals of the MnIV complex gave a green solution of MnII-(py)2(dbsq)2. This compound is related to the MnIV complex by transfer of two electrons from the reduced catecholate ligands to the oxidized metal. Magnetic and spectral studies have been used to study the equilibrium (1) between the Mn" and MnIV forms.1 Electron transfer reactions which occur during energy conversion processes in biological systems sometimes involve
In an attempt to mimic the iron‐quinone couple of the bacterial reaction center the IR spectral, magnetic and Moessbauer characterization of the high‐spin Fe(II) complexes (I) is reported.
The interaction of ferrous sulfate heptahydrate with different lawsone derivatives in MeOH/H2O (4:1) gives the high‐spin complexes (I) containing the bound quinone ligands in their fully oxidized form.
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