Stereochemistry of Cobalt Porphyrins. I. The Structure and Characterization of 2,3,7,8,12,13,17,18-Octaethylporphinatobis(3-methylpyridine)cobalt(II)

Robert G. Little, James A Ibers*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

69 Scopus citations


The six-coordinate Co(II) porphyrin, Co(3-pic)2(OEP) (3-pic = 3-picoline = 3-methylpyridine), has been prepared and characterized by a complete X-ray structural determination. The structure has been refined anisotropically to a final conventional R value (on F) of 0.036 based on 3628 values of Fo2 above background. The complex crystallizes in the triclinic space group Ci1-P1 with a = 10.187 (3) Å, b = 11.258 (4) Å, c = 9.753 (3) Å, α = 93.10 (2)°, β = 92.32 (2)°, γ = 113.28 (2)°, and Z = 1. Hence the molecule has a crystallographically imposed center of symmetry. The axial Co-N(3-pic) bond length of 2.386 (2) Å is long compared with the average equatorial Co-N bond length of 1.992 (1) Å. The lengthening of the axial bond is attributed to the occupancy of the dz2 orbital by a single unpaired electron.

Original languageEnglish (US)
Pages (from-to)4440-4446
Number of pages7
JournalJournal of the American Chemical Society
Issue number14
StatePublished - Jul 1 1974

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry


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