Details

Autor(en) / Beteiligte

• Rozhkova, Elena A.
• Evstigneeva, Rima P.
• Nemykin, Victor N.

Titel

Solution coordination chemistry of protohaemin IX peptide derivatives

Ist Teil von

• Journal of porphyrins and phthalocyanines, 1999-12, Vol.3 (8), p.691-702

Ort / Verlag

Chichester, UK: John Wiley & Sons, Ltd

Erscheinungsjahr

1999

Link zum Volltext

Beschreibungen/Notizen

• As part of an investigation aimed at developing artificial models for mimicking haemoprotein activity, four C‐aminoacyl protohaemin IX derivatives with one or two ‐L‐Leu‐L‐HisOMe (complexes 3 and 1) or ‐β‐Ala‐L‐HisOMe (complexes 4 and 2) peptide fragments have been studied by means of electronic and ESR spectroscopy. The bis‐His complexes 1 and 2 are predominantly low‐spin (S = 1/2) species, while the mono‐His complexes 3 and 4 are predominantly high‐spin (S = 5/2) species. Products of the treatment of starting complexes 1–4 with trichloroacetic acid, acetic acid, methylimidazole, sodium cyanide and sodium hydroxide have been analysed by electronic spectroscopy. Weak‐field ligands lead to predominantly high‐spin hexacoordinated complexes, while strong‐field ligands result in predominantly low‐spin ones. © 1999 John Wiley & Sons, Ltd.