Resonance Raman spectra of 15N enriched metallooctaethylorphyrins. Characterization of the oxidation state marker bands of hemoproteins |
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| Authors: | T Kitagawa M Abe Y Kyogoku H Ogoshi H Sugimoto Z Yoshida |
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| Institution: | Institute for Protein Research, Osaka University, Suita, Osaka, 565, Japan;Department of Synthetic Chemistry, Faculty of Engineering, Kyoto University, Yoshida, Sakyoku, Kyoto, 606, Japan |
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| Abstract: | Resonance Raman spectra of 15N enriched metallooctaethylporphyrins M(OEP) ? 15N4] M = Ni2+, Fe3+ (high spin), and Fe3+ (low spin)] were observed. Polarized Raman lines corresponding to the oxidation state marker band of hemoproteins were observed at 1377 (Ni), 1369 (Fe high spin) and 1372?1 (Fe low spin) which were shifted to lower frequency from those of the 14N compounds by 6, 5, and 6 cm?1, respectively. The vibrational mode for this band was shown to include an appreciable contribution of the CαN symmetric stretching vibration and to be associated with ca. 0.01 Å of in-phase displacement of the four pyrrole nitrogens toward the metal ion. |
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| Keywords: | To whom correspondence should be addressed at Department of Chemistry The University Southampton UK |
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