Saddle-shaped six-coordinate iron(III) porphyrin complexes showing a novel spin crossover between S = 1/2 and S = 3/2 spin states

Takahisa Ikeue, Yoshiki Ohgo, Tatsuya Yamaguchi, Masashi Takahashi, Masuo Takeda, Mikio Nakamura

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The field strength of the axial ligands determines the spin state of saddled iron(III) porphyrin complexes (see picture). Strong axial ligands (L), such as imidazole and 4-dimethylaminopyridine, lead to the formation of complexes with a pure S = 1/2 state, while weak ligands, such as THF, give complexes with a pure S = 3/2 state. Intermediate strength ligands, such as pyridine and 4-cyanopyridine, give complexes that show a novel spin crossover between the S = 1/2 and S = 3/2 states.

Original languageEnglish
Pages (from-to)2617-2620
Number of pages4
JournalAngewandte Chemie - International Edition
Issue number14
Publication statusPublished - 2001 Jul 16



  • Iron
  • Magnetic properties
  • Moessbauer spectroscopy
  • Porphyrinoids
  • Spin crossover

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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