title: 1H-NMR and rosonance Raman spectra of octaethylporphyrinatoiron(III) perchlorate and its mono imidazole adduct.
abstract: The 1H-NMR spectra and the resonance Raman spectra of intermediate spin complex, octaethylporphyrinatoiron (III) perchlorate (OEP-Fe(III)ClO4) and its mono imidazole adduct have been recorded and analyzed. The perchlorate complex was determined to be an intermediate-spin state (S = 3/2) in dichloromethane. The mono imidazole and 2-methylimidazole adducts of OEP-Fe(III)ClO4 were of the high-spin state in dichloromethane, which is a good model for the ferrihemoproteins such as metmyoglobins. The spin state of OEP-Fe(III)ClO4 varies the polarity of solvent from typical high-spin (S = 5/2) to typical low-spin (S = 1/2) state including intermediate-spin state (S = 3/2). The resonance Raman studies of the intermediate-spin complex in various solvents indicate that the complex is a plausible model to reproduce anomalous physico-chemical properties of the ferricytochrome c' at physiological condition.
mesh_terms: D003574:Cytochrome c Group; D004578:Electron Spin Resonance Spectroscopy; D006418:Heme / Q000031:analogs & derivatives; D006427:Hemin; D007093:Imidazoles; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D010472:Perchlorates; D012997:Solvents; D013059:Spectrum Analysis, Raman
chemical_list: D003574:Cytochrome c Group; D007093:Imidazoles; D010472:Perchlorates; D012997:Solvents; D006418:Heme; C022888:octaethylporphyrinatoiron(III)perchlorate; C022889:octaethylporphyrinato-iron(III)perchlorate, monoimidazole adduct; D006427:Hemin