title: [Not Available].
abstract: The complexes of iron(II) with violuric acid and 2-thiovioluric acid have been studied by conductimetry, potentiometry, and spectrophotometry at 25 degrees in aqueous medium. The formation of triviolurate [Fe(C(4)H(2)N(3)O(4))(-)(3) and trithioviolurate [Fe(C(4)H(2)N(3)O(3)S)(-)(3)] compounds with iron(II) is confirmed, and their maximum absorptions are at 605 nm and 615 nm respectively. The stability constants of these complexes were determined at ionic strength 0.5M by potentiometry and spectrophotometry. These two methods gave nearly the same results: (4.0 +/- 0.3) x 10(8) and (8.3 +/- 0.7) x 10(8) for the violurate complex and (1.1 +/- 0.5) x 10(9) and (1.45 +/- 0.7) x 10(9) for the thioviolurate complex.
authors.affiliation: Laboratoire de Chimie Analytique, Ecole Nationale Supérieure de Chimie de Lille, B.P. 40, 59650 Villeneuve d'Ascq, France.
authors.forename: N
authors.initials: N
authors.lastname: Delannoy
authors.forename: J M
authors.initials: JM
authors.lastname: Degorre
authors.forename: A
authors.initials: A
authors.lastname: Delannoy
authors.forename: J
authors.initials: J
authors.lastname: Nicole
authors.forename: J
authors.initials: J
authors.lastname: Hennion