Structure of the cobalt(II)-“capped” porphyrin, Co(C3-Cap).3CHCl3

John W. Sparapany, Maxwell J. Crossley, Jack E. Baldwin, James A Ibers*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


The structure of Co(C3-Cap).3CHCl3 consists of the packing of discrete porphyrin and solvate molecules. The Co(C3-Cap) moiety displays its expected connectivity in which the mean planes of the benzene cap and the porphyrin are nearly coplanar (dihedral angle, 2.4°) with the center of the cap nearly over the Co site. The Co atom is 3.436 Å from the mean cap plane; the centroid of the cap atoms is 3.494 Å from the mean porphyrin plane. Thus this C3-cap displays a cap-to-porphyrin separation that is about 0.5 Å less than that found in the known C2-cap structures. The porphyrin in Co(C3-Cap) is severely ruffled with an average deviation of the atoms from the mean porphyrin plane of 0.30 Å and individual deviations as large as 0.6 Å. Implications of structural results on the C2-caps and the present C3-cap for O2 and CO affinities are discussed. Crystallographic data: monoclinic, P21/n, Z = 4, a = 20.111 (13) Å, b = 15.660 (11) Å, c = 22.796 (16) Å, β = 110.49 (2)° at -150 °C, 8153 observations, 443 variables, R(F) (F 2 > 3σ(F 2)) = 0.100. The solvate molecules are badly disordered.

Original languageEnglish (US)
Pages (from-to)4559-4564
Number of pages6
JournalJournal of the American Chemical Society
Issue number14
StatePublished - Jul 1 1988

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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