کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1801831 1024580 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Magnetism of ferriprotoporphyrin IX monomers and dimers
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Magnetism of ferriprotoporphyrin IX monomers and dimers
چکیده انگلیسی

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 322, Issue 8, April 2010, Pages 999–1003
نویسندگان
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