A New Family of Anionic FeIII Spin Crossover Complexes Featuring a Weak-Field N2O4 Coordination Octahedron

Kazuyuki Takahashi, Kiko Kawamukai, Mitsunobu Okai, Tomoyuki Mochida, Takahiro Sakurai, Hitoshi Ohta, Takashi Yamamoto, Yasuaki Einaga, Yoshihito Shiota, Kazunari Yoshizawa

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


Unprecedented anionic FeIII spin crossover (SCO) complexes involving a weak-field O,N,O-tridentate ligand were discovered. The SCO transition was evidenced by the temperature variations in magnetic susceptibility, Mössbauer spectrum, and coordination structure. The DFT calculations suggested that larger coefficients on the azo group in the HOMO-1 of a ligand might contribute to the enhancement of a ligand-field splitting energy. The present anionic SCO complex also exhibited the light- induced excited-spin-state trapping effect. Photoinduced spin transition: Unprecedented anionic spin crossover (SCO) complexes involving a weak-field FeIIIN2O4 coordination sphere were discovered. The tetramethylammonium salt of the depicted SCO anion exhibited the light-induced excited-spin-state trapping effect, which is quite rare in FeIII SCO complexes (see scheme).

Original languageEnglish
Pages (from-to)1253-1257
Number of pages5
JournalChemistry - A European Journal
Issue number4
Publication statusPublished - 2016 Jan 22


  • anions
  • iron
  • photoinduced spin transition
  • spin crossover
  • weak-ligand field

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry


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