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Orientations of axially coordinated imidazoles and pyridines in crystal structures of model systems of cytochromes

Samo za registrovane korisnike
2006
Autori
Rakic, AA
Medaković, Vesna
Zarić, Snežana
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentu
Apstrakt
Many properties of cytochromes and model systems depend on orientations of axial ligands. In this work, we elucidated the role of porphyrin substituents on orientation of axial ligands in model systems of cytochromes. The orientations of axially coordinated imidazoles and pyridines in crystal structures of model systems of cytochromes were analyzed and data were compared with previous quantum-chemical calculations. The results show that eight ethyl groups on porphyrin ring strongly favor parallel orientation, hence, in all these complexes axial ligands, pyridines or imidazoles, are mutually parallel. Four phenyl or mesityl groups at meso-carbons also favor parallel orientation but less strongly. Hence, in most of the bis-imidazole complexes the orientation is parallel, while in bis-pyridine complexes the orientation of pyridines depends on oxidation state of Fe. In bis-pyridine Fe(II) complexes orientation is parallel, in Fe(III) it is orthogonal. This analysis is in agreement with pre...vious quantum-chemical calculations. (C) 2005 Elsevier Inc. All rights reserved.

Ključne reči:
axial ligands / porphyrin / cytochromes / imidazole / pyridine
Izvor:
Journal of Inorganic Biochemistry, 2006, 100, 1, 133-142
Izdavač:
  • Elsevier Science Inc, New York

DOI: 10.1016/j.jinorgbio.2005.10.010

ISSN: 0162-0134

PubMed: 16356550

WoS: 000234770200015

Scopus: 2-s2.0-29344472619
[ Google Scholar ]
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URI
http://cherry.chem.bg.ac.rs/handle/123456789/751
Kolekcije
  • Radovi
Institucija
Hemijski fakultet

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