Abstract
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.
Original language | English (US) |
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Pages (from-to) | 4235-4240 |
Number of pages | 6 |
Journal | Journal of the American Chemical Society |
Volume | 106 |
Issue number | 15 |
DOIs | |
State | Published - Jan 1 1984 |
ASJC Scopus subject areas
- Catalysis
- Chemistry(all)
- Biochemistry
- Colloid and Surface Chemistry