Mössbauer spectroscopic and magnetic properties of iron/III/ pheophytins |
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| Authors: | H Hori K Kadono H Inoue T Shirai E Fluck |
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| Institution: | (1) Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, 223 Yokohama, Japan;(2) Gmelin-Institut der Max-Planck-Gesellschaft, Varrentrappstrasse 40/42, D-6000 Frankfurt am Main 90, FRG |
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| 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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