Systematic trends in metalloporphyrin optical spectra Academic Article uri icon


  • We report the effects of axial ligands (L) on the optical spectra of cobalt-substituted myoglobin, horseradish peroxidase, and cytochrome P450cam. In addition, we present data for a series of octapyrrole-substituted zinc porphyrin complexes. The response of a metalloporphyrin to the change of ligand is more complicated than previously noted and is not the same for pyrrole-substituted porphyrins as it is for meso-tetraaryl-substituted compounds. Perturbations by the ligand not only shift the overall spectrum as previously observed but also systematically change the frequency difference between the Soret (B) and the α-β (Q) bands. The observed trends in band frequencies can nevertheless be readily understood within the four-orbital model of Gouterman. Interpretation of band intensities is less clear. © 1984, American Chemical Society. All rights reserved.

published proceedings

  • Journal of the American Chemical Society

author list (cited authors)

  • Wang, M., & Hoffman, B. M

citation count

  • 42

complete list of authors

  • Wang, MY Rachel||Hoffman, Brian M

publication date

  • July 1984