A Dinuclear Iron Complex with Two Cofacial [FeS4] Cores Linked by Covalent Ligand Periphery Clamps and Dissociable Thiolate Bridges

• Published in: European journal of inorganic chemistry 2003-03, Vol.2003 (5), p.903-907
• Main Authors: Sellmann, Dieter, Peters, Kai P., Molina, Raquel Montón, Heinemann, Frank W.
• Format: Article
• Language: English
• Subjects: Bridging ligands; Enzyme models; Iron; S ligands
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.200390119

As part of a long‐term study of dinuclear iron complexes with sulfur‐rich coordination spheres and cofacial, sterically variable binding sites for molecules relevant to nitrogenase, the complex (AsPh4)2 [{Fe(‘apS4’)}2] (5) was synthesized and completely characterized [‘apS4’4− = 1,3‐bis(2,3‐dimercaptobenzamido)propane(4−)]. Complex 5 contains two cofacial [FeIII(S2C6H4R)2]− units linked by [Fe−S−Fe] thiolate bridges and two peripheral propanediamide ligand backbones that are located on opposite sides of the molecular anion and prevent the complete separation of the two [FeS4] cores of 5 if the Fe−S−Fe bridges dissociate. No marked differences were found in the molecular parameters, spectroscopic, magnetic and electrochemical properties of the [Fe2S8] cores in the anion of 5 and the parent complex [{Fe(S2C6H4)2}2]2−. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)