Hyperfine Shifts of the 13C-NMR. in Protoporphyrin IX Iron (III) Dicyanide and Deuteroporphyrin IX Iron (III) Dicyanide

✍ Scribed by Kurt Wüthrich; Rudolf Baumann

• Publisher: John Wiley and Sons
• Year: 1974
• Tongue: German
• Weight: 833 KB
• Volume: 57
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.19740570208

✦ Synopsis

Abstract

The ^13^C‐NMR. in Zn(II) (Protoporphyrin IX), Fe(III) (Protoporphrin IX) (CN)~2~, Zn(II) (Deuteroporphyrin IX dimethylester), and Fe(III) (Deuteroporphyrin IX) (CN)~2~ have been identified, and the ^13^C hyperfine shifts in the iron complexes evaluated. In a partial analysis of these data the parameters Q^H^, Q~CCH~^H^, and Q~C′CH~^C^, which characterize the isotropic coupling through hyperconjugation between the ^1^H and ^13^C nuclei of the porphyrin side chains and the unpaired electron spin density on the aromatic ring carbon atoms, have been re‐examined. This paper is part of an investigation of the electronic states in low spin ferric hemes and hemoproteins, and the relations between the electronic structures and the biological roles of these molecules.