Macroinorganics. 9. Enthalpies of protonation and copper(II) complex formation of some poly(amidoamines)

Abstract

The heats of protonation and complex formation with Cu(II) of two classes of poly(amido amines) have been measured calorimetrically at 25 °C in 0.1 M NaCl solution, and the corresponding entropy values have been calculated. The heats of complex formation have been determined by titration with acid, base, or free metal ion, and the results of the different techniques are in good agreement with each other. The effect of lengthening the aliphatic chain between the aminic groups has been studied for both classes of polymers. The different complexing abilities of the two classes of polymers are attributed to the participation of carbonyl groups, in addition to participation of the amino groups, to the complexation only in symmetrically substituted polymers. The heats of hydrolysis of the CuL2+ complexes have also been determined. © 1983, American Chemical Society. All rights reserved.