Electron paramagnetic resonance rhombic spectra

Electron Paramagnetic Resonance Spectra. Only two of these complexes exhibit well-resolved EPR spectra. A narrow, isotropic signal observed at g = 2.005 for the trinuclear complex 12 at low temperatures is consistent with an S = 1/2 ground state169), but a detailed description of the electronic properties of the complex remains to be developed. The [Fe(MoS4)2]3 ion shows a rhombic S = 3/2 EPR spectrum that is very solvent dependent and, under certain conditions, is somewhat similar in apperance to that of FeMo-com). For example, in frozen aqueous solution, the apparent g values are 5.3,2.6, and 1.7181). If complex 14 also proves to have an S = 3/2 ground state, a somewhat similar EPR spectrum at low temperature would be expected as well. 

Electron paramagnetic resonance spectroscopy has contributed greatly to the understanding of the configuration of the iron in LAM. In initial spectroscopic studies, the as-purified enzyme exhibited a rhombic spectrum at 10 K. The signal was centered at g = 2.007, and underwent power saturation at the same temperature in a homogeneous manner with a = 15 2 mW. At higher temperatures the... 

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