Stabilization of Superoxidized Form of Synthetic Fe4S4 Cluster as the First Model of High Potential Iron Sulfur Proteins in Aqueous Media
Resource
Inorganic Chimica Acta, v.209, p.143
Journal
Inorganic Chimica Acta
Journal Volume
209
Journal Issue
2
Pages
143-149
Date Issued
1993
Date
1993
Author(s)
Abstract
The adamantanethiolate ligated Fe4S4 cluster, [Fe4S4(SAd)4]2-, exhibits two stable [Fe4S4]2+/+ and [Fe4S4]3+/2+ redox couples in dry DMF, while [Fe4S4(SAd)4]- readily undergoes a hydrolysis reaction by the addition of a small amount of H2O in DMF (3 vol.%). The hydrolysis of [Fe4S4(SAd)4]- can be effectively depressed by the presence of free AdSH in H2O/DMF, and also by solubilization in aqueous PDAH solutions (PDAH = poly[2- (dimethylamino)hexanamide]). The observation that the crystal structure of (Ph4As)2[Fe4S4(SAd)4] has enough space for coordination of H2O to the Fe4S4 core indicates that stabilization of [Fe4S4(SAd)4]- in aqueous media is ascribed to depression of dissociation of AdS- from the [Fe4S4]3+ core rather than hydrophobic spheres around the [Fe4S4]3+ core. © 1993.
SDGs
Type
journal article