Abstract
Mössbauer spectra of /pheophytinato a/ iron/III/ chloride [Fe/Pheo-a/Cl] and /pheophytinato b/ iron/III/ chloride [Fe/Pheo-b/Cl] have revealed that the central iron/III/ ion is in a high-spin state and axially coordinated by chloride ions in solid phase. Temperature-dependent asymmetry observed for the quadrupole splitting doublet of iron/III/ pheophytins, i.e., Fe/Pheo-a/Cl and Fe/Pheo-b/Cl, is interpreted on the basis of the zero-field splitting. The structural difference between iron/III/ pheophytins and iron/III/ porphyrins is reflected in the quadrupole splitting more than in the isomer shift. Magnetic behaviour of iron/III/ pheophytins near 4.2 K is very similar to that of iron/III/ porphyrins.
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Hori, H., Kadono, K., Inoue, H. et al. Mössbauer spectroscopic and magnetic properties of iron/III/ pheophytins. Journal of Radioanalytical and Nuclear Chemistry Letters 136, 159–168 (1989). https://doi.org/10.1007/BF02164106
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DOI: https://doi.org/10.1007/BF02164106