ChemInform Abstract: Correlation Among the Structural, Electronic, and Magnetic Properties of [Fe4(mu3-S)3(mu3-S2)Cp4]n+ (n: 0--2) Clusters at Various Oxidation States.

ChemInform Abstract

The series of title complexes is examined by means of Mößbauer and NMR spectra together with an X-ray structure analysis of the dication (I) (space group Pbca with Z=8). The Fe₄S₅ core structure is retained as in the monocation. More substandial are the "variations observed in the bonding Fe-Fe interactions. The successive reduction (or oxidation) steps produce significant structural changes at the four-coordinated Fe sites but not at the five-coordinated Fe site. The studies provide evidence that the unpaired electron spin density is mostly localized on the sulfur Centers.