The macrocycle 1,4,7-triazacyclononane-N-acetate (L) reacted with FeCl3·6H2O in water to form the monomeric complex [FeCl2L] 1. Hydrolysis of 1 in the presence of an excess of sodium acetate and sodium perchlorate yielded the binuclear complex [Fe2(μ-O)(μ-O2CMe)L2]ClO 4·NaClO4·2H2O 2. Complexes 1 and 2 have been characterised by X-ray crystallography. In 1 the FeIII is surrounded by a distorted-octahedral array of one fac-coordinated triamine ring, one monodentate carboxylato group and two chloride ligands. Complex 2 consists of a μ-oxo-μ-acetato-diiron(III) core with the distorted octahedral co-ordination sphere about each FeIII being completed by the ligand L. A sodium ion, with distorted trigonal-bipyramidal stereochemistry, bridges between the co-ordinating carboxylate oxygens of the terminal ligands. Complex 2 exhibits spectroscopic features and magnetic properties similar to those of other μ-oxo-diiron(III) complexes as well as metalloproteins incorporating a μ-oxo-diiron(III) unit at their active sites.
|Number of pages||7|
|Publication status||Published - 7 Mar 1997|