Electron paramagnetic resonance of trans-disubstituted bis(ethylenediamine)chromium(III) complexes in frozen solutions

1970 ◽  
Vol 9 (9) ◽  
pp. 2064-2072 ◽  
Author(s):  
J. C. Hempel ◽  
Leon O. Morgan ◽  
Warren Burton Lewis
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Paramagnetic Resonance ◽  
Frozen Solutions ◽  
Electron Paramagnetic

The Electron Paramagnetic Resonance Spectrum at 77 °K of Lyophilized and Frozen Solutions of Horse Heart Ferricytochrome c

1971 ◽  
Vol 49 (3) ◽  
pp. 328-331 ◽  
Author(s):  
R. A. Morton ◽  
T. L. Bohan
Keyword(s):  
Molecular Structure ◽  
Electron Paramagnetic Resonance ◽  
Electron Paramagnetic Resonance Spectrum ◽  
Resonance Spectrum ◽  
Paramagnetic Resonance ◽  
Commercial Preparation ◽  
Frozen Solution ◽  
Ferricytochrome C ◽  
Frozen Solutions ◽  
Electron Paramagnetic

The electron paramagnetic resonance spectrum of a repurified, commercial preparation of horse heart ferricytochrome c was measured both in frozen solution, and as a lyophilized powder at 77 °K. The solution spectrum agreed with previous measurements reported at 20 °K. The lyophilized powder had both high-spin (g ~ 6), and low-spin components. The latter were significantly different from that of the solution spectrum. Thus, the molecular structure of the protein near the iron atom must be considerably, but reversibly, distorted by drying. In addition, it was suggested that a g = 4.29 line was due to acid-denatured forms of cytochrome c present as an impurity.

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