The use of outer-sphere complex formation reactions in ion-exchange chromatography Separation of maleate and fumarate ions.
Outer-sphere complex formation reactions have been used to increase the selectivity of ion-exchange separation of maleate and fumarate ions. The stability constants of the maleate and fumarate complexes of tris(ethylenediamine)cobalt(III) and hexa-amminecobalt(III) have been determined at different ionic strengths from the elution volumes and the parameters of the ion-exchanger bed, and the values at I = 0 obtained by extrapolation. They are: log K [Co(en)(3+)(3) + Ma(2-)] = 3.33; log K [Co(NH(3))(3+)(6) + Ma(2-)] = 3.77; log K [Co(en)(3+)(3) + Fu(2-)] = 1.19; log K [Co(NH(3))(3+)(6) + Fu(2-)] = 1.99. The two anions can be separated quantitatively.
Halmos
P
P
Institute for Analytical Chemistry, University of Chemical Engineering, Veszprém, Hungary.
Inczédy
J
J