Magnetism of ferriprotoporphyrin IX monomers and dimers
Source abstract
Abstract
Abstract The SQUID and the 57 Fe Mossbauer 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 Mossbauer spectroscopy is proposed as a new precise quantitative analytical methodology for monitoring of the aggregation process of iron porphyrin.
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Research context
OpenAlex topics: Porphyrin and Phthalocyanine Chemistry · Surface Chemistry and Catalysis · Photosynthetic Processes and Mechanisms
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References (22)
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