Syntheses and characterisation of mono- and di-nuclear iron(III) complexes of 1,4,7-triazacyclononane-N-acetate (L). Crystal structures of [FeCl2L] and [Fe2(μ-O)(μ-O2CMe)L2]ClO 4· NaClO4·2H2O

Bim Graham, Boujemaa Moubaraki, Keith S. Murray, Leone Spiccia, John D. Cashion, David C R Hockless

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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.

Original languageEnglish
Pages (from-to)887-893
Number of pages7
Issue number5
Publication statusPublished - 7 Mar 1997

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