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Titolo:
DETERMINATION OF THE FE-LIGAND BOND LENGTHS AND FE-N-O BOND ANGLES INHORSE HEART FERRIC AND FERROUS NITROSYLMYOGLOBIN USING MULTIPLE-SCATTERING XAFS ANALYSES
Autore:
RICH AM; ARMSTRONG RS; ELLIS PJ; LAY PA;
Indirizzi:
UNIV SYDNEY,SCH CHEM SYDNEY NSW 2006 AUSTRALIA UNIV SYDNEY,SCH CHEM SYDNEY NSW 2006 AUSTRALIA
Titolo Testata:
Journal of the American Chemical Society
fascicolo: 42, volume: 120, anno: 1998,
pagine: 10827 - 10836
SICI:
0002-7863(1998)120:42<10827:DOTFBL>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLUBLE GUANYLATE-CYCLASE; ELECTRON-PARAMAGNETIC-RESONANCE; NITRIC-OXIDE SYNTHASE; SPERM WHALE MYOGLOBIN; RAY-ABSORPTION-SPECTROSCOPY; HEME-PROTEINS; CARBON-MONOXIDE; RAMAN-SPECTRA; MOLECULAR STEREOCHEMISTRY; MODEL COMPOUNDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
81
Recensione:
Indirizzi per estratti:
Citazione:
A.M. Rich et al., "DETERMINATION OF THE FE-LIGAND BOND LENGTHS AND FE-N-O BOND ANGLES INHORSE HEART FERRIC AND FERROUS NITROSYLMYOGLOBIN USING MULTIPLE-SCATTERING XAFS ANALYSES", Journal of the American Chemical Society, 120(42), 1998, pp. 10827-10836

Abstract

The structural characterizations of the Fe environments in the NO adducts of horse heart ferric (Fe-III) and ferrous (Fe-II) nitrosylmyoglobin (MbNO) have been achieved by multiple-scattering (MS) analyses of XAFS data obtained from frozen aqueous solutions. For Mb(II)NO, the MSanalysis resulted in an averaged Fe-N-p (pyrrole) distance of 2.00 Angstrom, an Fe-N-epsilon (imidazole) distance of 2.05 Angstrom, an Fe-N-NO distance of 1.75 Angstrom, and an Fe-N-O angle of 150 degrees. Forcomparison, the MS analysis of the XAFS data of [Fe-II(TPP)(NO)] (TPP= tetraphenylporphyrinato) resulted in bond lengths of 2.01 Angstrom for Fe-N-p and 1.74 Angstrom for Fe-N-NO and an Fe-N-O bond angle of 155 degrees. The Fe-N-NO and N-O distances obtained from the analysis of Mb(II)NO are in good agreement with those determined crystallographically for [Fe-II(TPP)(NO)] with and without 1-methylimidazole (1-MeIm)as the sixth ligand. The MS analysis of Mb(III)NO yielded an average Fe-N-p distance of 2.00 Angstrom, an Fe-N-epsilon distance of 2.04 Angstrom, an Fe-N-NO distance of 1.69 Angstrom, and an Fe-N-O angle of 180 degrees. These bond lengths and angles are consistent with the crystal structures of model complexes [Fe-III(TPP)(NO)(OH2)](+) and [Fe-III(OEP)(NO)](+) (OEP = octaethylporphyrinato). The final XAFS R values were 14.5, 14.6, and 12.7% for Mb(III)NO, Mb(II)NO, and [Fe-II(TPP)(NO)], respectively.

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Documento generato il 02/12/20 alle ore 08:08:52