A new spectrophotometric method for differentiating mononuclear and polynuclear complexes and for determining their extraction constants.
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.
Galan
T R
TR
Department of Analytical Chemistry, Faculty of Sciences, University of Extremadura, Badajoz, Spain.
Ramirez
A A
AA
Ceba
M R
MR