
%0 Journal Article
%A Powell, HKJ 
%A Taylor, MC 
%T Interactions of iron(II) and iron(III) with gallic acid and its homologues: a potentiometric and spectrophotometric study
%J Australian Journal of Chemistry
%D 1982/04/01
%V 35
%N 4
%P 739-756
%K 
%R https://doi.org/10.1071/CH9820739
%U https://www.publish.csiro.au/paper/CH9820739 
%X The reactions between iron(III) and the phenols gallic acid, catechol, protocatechuic acid and pyrogallol have been studied in aqueous solution at 25ºC (I 0.10 M KCl). From spectrophotometric and pH titration data it was established that (i) complexes with 1 : 1, 1 : 2 and 1 : 3 (M : L) stoichiometry are formed in oxygenated solution, (ii) the redox reaction given at low pH by these ligands  Fe3+ + ½phenol &#8594; Fe2+ + ½quinone + H+ is not reversed by complexing of Fe3+ at higher pH, and (iii) the percentage composition of iron(II) and iron(III) in solutions of these ligands is a function of ER (ligand), the pH and age of solutions and the partial pressure of dissolved oxygen. 
