Magnetic circular dichroism spectroscopy of cobalt tetraphenyltetraacenaphthoporphyrin

John Mack, Yoshiaki Asano, Nagao Kobayashi, Martin J. Stillman

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The first MCD spectral data for an open shell first row transition metal complex of tetraphenyltetraacenaphthoporphyrin (TPTANP) are reported. The B (or Soret) band of cobalt tetraphenyltetraacenaphthoporphyrin (CoIITPTANP(-2)) exhibits an anomalous negative Faraday A1 term as was reported previously in the case of ZnTPTANP, while a positive A1 term is observed for the Q band. INDO/1 geometry optimizations predict that the TPTANP ligand is saddled due to steric hindrance at the ligand periphery to a slightly lesser extent than is the case with ZnTPTANP. The Q and B bands of CoTPTANP arising from the π-system are blue shifted relative to those of ZnTPTANP, based on the "hypso" effect reported previously for planar porphyrin complexes of d6-9 transition metals.

Original languageEnglish
Pages (from-to)472-479
Number of pages8
JournalJournal of Inorganic Biochemistry
Issue number3
Publication statusPublished - 2008 Mar


  • Co(II)
  • DFT calculations
  • Magnetic circular dichroism spectroscopy
  • Non-planar porphyrin
  • Red-shifted Q band

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry


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