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.
ASJC Scopus subject areas
- Colloid and Surface Chemistry