Redox properties of the diheme cytochrome c4 from Azotobacter vinelandii and characterisation of the two hemes by NMR, MCD and EPR spectroscopy

1,2-Dimethylhydrazine co-ordinates to numerous metal cations. The structures of the complexes of Cr, Mn, Co, Ni, Cu, Zn, Cd, Hg and Pt are discussed and the complexing abilities of the 1,2-dimethylhydrazine molecule are determined on the basis of the ligand field spectra of the nickel and the chromium derivative.The results of polarography, cyclic voltammetry and photoelectron spectroscopy yield evidence on the redox properties of the neutral molecule. By means of EPR spectroscopy the nature of the radical products obtained by irradiation of 1,2-dimethylhydrazine, especially of the radical cation, is determined.

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Synthesis, Redox Properties, and EPR Spectroscopy of Manganese(III) Complexes of the Ligand N,N-Bis(2-hydroxybenzyl)-N′-2-hydroxybenzylidene-1,2-diaminoethane: Formation of Mononuclear, Dinuclear, and Even Higher Nuclearity Complexes

Chemistry - A European Journal ◽

10.1002/1521-3765(20020816)8:16<3757::aid-chem3757>3.0.co;2-8 ◽

2002 ◽

Vol 8 (16) ◽

pp. 3757 ◽

Cited By ~ 22

Author(s):

Heimo Schmitt ◽

Reiner Lomoth ◽

Ann Magnuson ◽

Jonathan Park ◽

Jacob Fryxelius ◽

...

Keyword(s):

Epr Spectroscopy ◽

Redox Properties

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Redox properties and electron paramagnetic resonance spectroscopy of the transition state complex of Azotobacter vinelandii nitrogenase

FEBS Letters ◽

10.1016/s0014-5793(98)00827-8 ◽

1998 ◽

Vol 432 (1-2) ◽

pp. 55-58 ◽

Cited By ~ 22

Author(s):

J.H. Spee ◽

A.F. Arendsen ◽

H. Wassink ◽

S.J. Marritt ◽

W.R. Hagen ◽

...

Keyword(s):

Electron Paramagnetic Resonance ◽

Transition State ◽

Azotobacter Vinelandii ◽

Electron Paramagnetic Resonance Spectroscopy ◽

Redox Properties ◽

Resonance Spectroscopy ◽

Paramagnetic Resonance ◽

Electron Paramagnetic

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Synthesis and redox properties of a [meso-tris(4-nitrophenyl) corrolato]Mn(III) complex

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424605000472 ◽

2005 ◽

Vol 09 (06) ◽

pp. 379-386 ◽

Cited By ~ 18

Author(s):

Jacob Fryxelius ◽

Gerriet Eilers ◽

Yashar Feyziyev ◽

Ann Magnuson ◽

Licheng Sun ◽

...

Keyword(s):

Epr Spectroscopy ◽

Chemical Oxidation ◽

Redox Properties ◽

Synthetic Method ◽

Reduction Step ◽

Parallel Mode ◽

Epr Signal

The Mn complexated corrole [ T (4- NO 2 P ) Corr ] Mn ( py ) (3) has been prepared ( py = pyridine ) where [ T (4- NO 2 P ) Corr ] is the trianion of the electron-poor 5,10,15-tris(4-nitrophenyl)corrole (1). The preparation of 3 includes a new synthetic method to form the corrole ligand 1 in a two-step synthesis. The Mn(III) complex gives a parallel mode EPR signal centered around g = 8.2 with six distinct hyperfine lines ( A || = 139 × 10-4 cm -1). Electrochemically 3 undergoes one reversible oxidation ( E 1/2 = 0.12 V vs Fc) and two reversible reductions ( E 1/2 = -1.45, -1.61 V). The oxidation is metal-centered and the product has been characterized by EPR spectroscopy as an S = 3/2 Mn(IV) species with no indication for oxidation of the macrocycle. The reductions of complex 3 are ligand based, and at the potential of the second reduction step a stable nitrogen centered radical with g = 2.0055 is generated. Chemical oxidation of 3 by iodosobenzene yields a Mn(IV) complex and epoxidation of cis-stilbene is not catalyzed by the Mn complex.

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