Dtw'ilctrtecl to Piofcrc.or Eimt Otto F i~t h e r 017 the> ol c ci\ioi? of h r~ 75th birt~7da1The coordination chemistry of metals in unusual oxidation states is a fascinating aspect of research in the field ofmetalloporphyrins. Of particular significance in this respect are oxoiron porphyrins containing tetravalent iron, since complexes of this sort occur as reactive intermediates in numerous biological and biomimetic oxidation processes."] Iron(iv) porphyrins, in which the metal is not present as part of a [Fe=O] (FRG) phyrinoids corrole["-the aromatic parent substance of corrin. the ring system of vitamin B,, --and iso~orrole['~ may enable the preparation of the corresponding neutral complexes, that is. types 2 and 4, respectively. This supposition appeared to be substantiated all the more so. as it was recently shown that stable iron(iv) complexes with ligands based on pentane-2,4-dione-bis(S-alky1isothiosemicarbazides)-which are also trianionic-could be synthesized.18,9] We have now found that octaethylcorrole 5 can be readily converted into the triad of stable complexes 7-9, all of which contain formally tetravalent iron."'] Furthermore, the existence of the iron corrole 10 (bearing an axial pyridine ligand) with a formal oxidation state of the metal of + 111 was corroborated.

No abstract

No abstract

Da kosmetische Mittel direkt mit dem Menschen in Kontakt kommen, sind die Anforderungen an die gesundheitliche Unbedenklichkeit hoch. Dies gilt für alle Kosmetika, auch für Naturkosmetik.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.