Influence of chelate effects on the water-exchange mechanism of polyaminecarboxylate complexes of iron(III)

Abstract

The effect of temperature and pressure on the water-exchange reactions of complexes of the type [FeIII(L)(H2O)x]n-, where L = edta4- (ethylenediaminetetraacetate), Hedta3- (monoprotonated form of edta), cdta4- (trans-1,2-diaminocyclohexanetetraacetate), edds4- (s,s-ethylenediaminedisuccinate), 1,3-pdta4- (1,3-propylenediaminetetraacetate), and alpha,beta-eddadp4-(alpha,beta-ethylenediaminediaceatedipropionate), was studied by employing 17O NMR techniques. The effect of potentially hexadentate ligands, covering a systematic variation of the size, substituents, and overall coordination geometry, on iron(III) complexes was investigated in terms of the lability of the coordinated water and the u..