title: A new spectrophotometric method for differentiating mononuclear and polynuclear complexes and for determining their extraction constants.
abstract: A new spectrophotometric method is proposed for differentiating mononuclear and polynuclear complexes as well as for determining the extraction constant K*(e) of any complex A(m)B(n). The method is based on the effect of dilution on the degree of dissociation of the complex. The precision of log K*(e) is +/- 0.03 when the degree of extraction of the metal is between 20 and 60%. The highest values of log K*(e) determinable by this method are 7, 19, 12 and 18 for 1:1, 2:2, 2:1 and 3:1 complexes, respectively.
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, University of Extremadura, Badajoz, Spain.
authors.forename: T R
authors.initials: TR
authors.lastname: Galan
authors.forename: A A
authors.initials: AA
authors.lastname: Ramirez
authors.forename: M R
authors.initials: MR
authors.lastname: Ceba