Metal ion recognition in ligands with negatively charged oxygen donor groups. Complexation of iron(III), gallium(III), indium(III), aluminum(III), and other highly charged metal ions

The existence of good linear relationships between the formation constant log values of complexes of ligands containing negative oxygen donor groups only and log K 1 (OH − ) values for the metal ions is demonstrated for a variety of ligands containing phenolate, carboxylate, and hydroxamate donor groups. The formation constants of DFB (desferriferrioxamine-B), BAMTPH (a synthetic trihydroxamate), and several dihydroxamic acids of the type HONHCO(CH 2 ) n CONHOH with several metal ions are reported and used to demonstrate the general existence of linear relationships of the above type