Models for cytochromes c′: Observation of an extremely labile spin state in monoimidazole complexes of saddle-shaped iron(III) porphyrinates

Akira Ikezaki, Masashi Takahashi, Mikio Nakamura

Research output: Contribution to journalArticle

13 Citations (Scopus)


Saddle in a spin: The saddle-shaped octaethyltetraphenylporphyrin-imidazole complex [FeIII (oetpp)(HIm)]+ adopts an essentially pure intermediate-spin state between 298 and 173 K in CD2Cl2 solution, the conditions under which the NMR spectra are recorded. This complex has shown, however, a novel spin transition from S=3/2 to S=5/2 and S=1/2 below 70 K. Thus, the complex exists as an equilibrium mixture of three spin isomers at 4 K.

Original languageEnglish
Pages (from-to)6300-6303
Number of pages4
JournalAngewandte Chemie - International Edition
Issue number34
Publication statusPublished - 2009 Aug 10



  • Cytochromes
  • Imidazoles
  • Iron
  • Porphyrinoids
  • Spin states

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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