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Title: Picosecond resonance Raman evidence of the structure of a long-lived electronic excited state of low-spin Fe(III)heme o
Authors: Schelvis, Johannes P.M. 
Varotsis, Constantinos 
Keywords: Pi-cation radicals;Triplet-state;Iron porphyrin;Spectra;Octaethylporphyrin;Spectroscopy;Transient;Zinc(II);Proteins;Tetraphenylporphyrin
Category: Physical Sciences
Field: Natural Sciences
Issue Date: 21-Apr-2000
Publisher: Elsevier Science B.V.
Source: Chemical Physics Letters, 2000, Volume 321, Issues 1–2, Pages 37-42
Abstract: The structure of the excited state of low-spin ferric heme o has been studied using picosecond time-resolved resonance Raman spectroscopy. The excited state has a lifetime of 10–30 ps, and the heme skeletal vibrations are shifted to lower frequencies relative to those in the electronic ground state. Based on the relatively small frequency shifts, we conclude that the relatively long-lived heme o excited state is not a porphyrin ππ* state. We propose that the heme o excited state is a charge transfer state, in which the heme iron donates an electron to the porphyrin macrocycle.
ISSN: 00092614
DOI: 10.1016/S0009-2614(00)00297-9
Rights: © 2000 Elsevier Science B.V.
Type: Article
Appears in Collections:Άρθρα/Articles

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