Magnetism of ferriprotoporphyrin IX monomers and dimers |
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Authors: | J. Stanek K. Dziedzic-Kocurek |
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Affiliation: | Marian Smoluchowski Institute of Physics, Jagiellonian University, 30-059 Kraków, Reymonta 4, Poland |
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Abstract: | The SQUID and the 57Fe Mössbauer spectroscopy studies of the magnetic properties of monomeric and dimeric forms of iron porphyrin were performed between 2 and 305 K. The effective magnetic relaxation rate of the Fe atoms in iron porphyrin monomers exhibits complex temperature dependence, resulting from the competing spin-spin and spin-lattice relaxation processes. The dimerization of iron porphyrin dramatically speeds up the magnetic relaxation. The Fe-Fe antiferromagnetic exchange coupling constant in Fe-O-Fe dimer is J≈−110 cm−1. The complementary application of SQUID and the Mössbauer spectroscopy is proposed as a new precise quantitative analytical methodology for monitoring of the aggregation process of iron porphyrin. |
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Keywords: | Protoporphyrin IX Oxo-dimer Magnetic relaxation Mö ssbauer spectroscopy SQUID |
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