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pubmed-article:272637pubmed:abstractTextWe have examined the photosensitivity of low-spin liganded hemoglobin, myoglobin, and peroxidase, and their metal-substituted analogues, using three different metals (Fe, Mn, Co) in several oxidation states and employing a variety of diatomic or pseudo-diatomic ligands (L). We have discovered a number of photosensitive systems, and present an overall stereo-electronic classification scheme for these photodissociation reactions: Linear, formally d6, metal-ligand fragments [e.g., Fe(II) +/- CO; Mn(II) +/- NO] are relatively photoliable, but systems with a bent fragment, and higher electron occupancy [e.g., Fe(II) +/- O2; Co(II) +/- NO] are relatively photoinert. Photostability appears to correlate with the occurrence of long-wavelength features in the optical absorption spectra, and the classification scheme is explained by considerations of electronic structure. The discussions are further applied to d5 systems and to low-spin d6 metalloporphyrins with nitrogenous bases as axial ligands.lld:pubmed
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pubmed-article:272637pubmed:authorpubmed-author:GibsonQ HQHlld:pubmed
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pubmed-article:272637pubmed:articleTitleOn the photosensitivity of liganded hemoproteins and their metal-substituted analogues.lld:pubmed
pubmed-article:272637pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:272637pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:272637pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
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