Picosecond resonance Raman evidence of the structure of a long-lived electronic excited state of low-spin Fe(III)heme o

Johannes Schelvis, Constantinos A. Varotsis

Research output: Contribution to journalArticleResearchpeer-review

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.

Original languageEnglish
Pages (from-to)37-42
Number of pages6
JournalChemical Physics Letters
Volume321
Issue number1-2
DOIs
StatePublished - 21 Apr 2000

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Heme
Excited states
electronics
porphyrins
excitation
Porphyrins
frequency shift
Raman spectroscopy
Ground state
charge transfer
Charge transfer
low frequencies
iron
life (durability)
vibration
Iron
ground state
Electrons
electrons

Cite this

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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",
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.",
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Picosecond resonance Raman evidence of the structure of a long-lived electronic excited state of low-spin Fe(III)heme o. / Schelvis, Johannes; Varotsis, Constantinos A.

In: Chemical Physics Letters, Vol. 321, No. 1-2, 21.04.2000, p. 37-42.

Research output: Contribution to journalArticleResearchpeer-review

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