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Proceedings of the All-Polish Seminar on Mössbauer Spectroscopy OSSM'04
Języki publikacji
Abstrakty
Electron configuration changes of Fe(III) ions in porphyrin complexes with chloride axial ligands caused by the successive nitrogen substitution of CH methine bridges at meso positions of the porphyrin ring is discussed on the basis of Mössbauer spectroscopy results. It was shown that increase of a number of nitrogen atoms at the meso positions changes the character of quantum-mechanically mixed spin state of Fe(III) ions (S = 5/2 + 3/2) by the increase of the intermediate-spin (S = 3/2) contribution. This feature is reflected in Mössbauer spectra by an increase of quadrupole splitting values and the decrease of the asymmetry of quadrupole doublets, when the number of nitrogen atoms at the meso positions increases. Isomer shifts remain practically unchanged. These peculiarities are discussed in the light of spin relaxation mechanisms and the occupancy of d orbitals in Fe(III) ions coordinated to the porphyrin ring and chloride ligand. It has been noticed that Mössbauer parameters correlate qualitatively with EPR data.
Czasopismo
Rocznik
Tom
Strony
13--16
Opis fizyczny
Bibliogr. 14 poz., rys.
Twórcy
autor
- Institute of Physics, Technical University of Częstochowa, 19 Armii Krajowej Ave., 42-200 Częstochowa, Poland, Tel./Fax: +48 34/ 325 07 95
autor
- Institute of Physics, Technical University of Częstochowa, 19 Armii Krajowej Ave., 42-200 Częstochowa, Poland, Tel./Fax: +48 34/ 325 07 95
autor
- Institute of Physics, Technical University of Częstochowa, 19 Armii Krajowej Ave., 42-200 Częstochowa, Poland, Tel./Fax: +48 34/ 325 07 95
autor
- Institute of Molecular and Atomic Physics, Belarus Academy of Sciences, 20 F. Skoryny Prosp., 220 072 Minsk, Belarus
Bibliografia
- 1. Blume M (1967) Temperature-dependent relaxation times: application to the Mössbauer spectra of ferric hemin. Phys Rev Lett 18:305−308
- 2. Brand RA, http://www.wissel-instruments.de/produkte/software.html
- 3. Burda K, Hrynkiewicz A, Kołoczek H, Stanek J, Strzałka K (1995) Mixed valence state in ironporphyrin aggregates. Biochim Biophys Acta 1244:345−350
- 4. Debrunner PG (1989) Mössbauer spectroscopy of iron porphyrins. In: Lever ABP, Gray HB (eds) Iron porphyrins. Part III. VCH Publishers, New York, pp 140−234
- 5. Dziliński K, Kaczmarzyk T, Jackowski T, Sinyakov GN, Egorova GD (2003) EPR and Mössbauer characterization of Fe(III)- and Fe(I)-azaporphyrins and comparison to related iron porphyrins. Mol Phys Reports 37:35−41
- 6. Dziliński K, Kaczmarzyk T, Sinyakov GN, Egorova GD (2001) Electron configuration in neutral and reduced 57Femonoazaetioporphyrins studied by EPR spectroscopy. Mol Phys Reports 34;2:65−71
- 7. Fitzgerald JP, Haggerty BS, Rhingold AL (1992) Iron octaethyltetraazaporphyrins: synthesis, characterization, coordination chemistry and comparison to related iron porphyrins and phthalocyanines. Inorg Chem 31:2006−2013
- 8. Kadish KM, Smith KM, Guilard G (eds) (2000) The porphyrin handbook. Vol 6: Applications: past, present and future. Academic Press, San Diego
- 9. Kadish KM, Smith KM, Guilard G (eds) (2003) The porphyrin handbook. Vol 11: Bioinorganic and bioorganic chemistry. Academic Press, Amsterdam S16 T. Kaczmarzyk et al.
- 10. Kobayashi N (2000) Meso-azaporphyrins and their analogues. In: Kadish KM, Smith KM, Guilard R (eds) The porphyrin handbook. Vol 3. Academic Press, San Diego, pp 301−321
- 11. Liao M-S, Scheiner S (2002) Comparative study of metalporphyrins, -porphyrazines, and phthalocyanines. J Comput Chem 23:1391−1403
- 12. Ogoshi H, Watanabe E, Yosida L et al. (1973) Synthesis and far-infrared spectra of ferric octaethylporphyne complexes. J Am Chem Soc 98:2845−2849
- 13. Sams JR, Tsin TB (1979) Mössbauer spectroscopy of iron porphyrins. In: Dolphin D (ed) The porphyrins. Vol 4. Academic Press, New York, pp 425−447
- 14. Scheidt RW, Reed ChA (1981) Spin-state/stereochemical relationship in iron porphyrins: implications for the hemoproteins. Chem Rev 81:543−555
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUJ6-0006-0004