Abstract

Potentiometric titrations of five generations of poly(propylene imine) dendrimers were performed at 0.1, 0.5, and 1.0 M KCl and NaCl. The titration curves reveal two-step protonation behavior similar to linear polyelectrolytes. The difference to linear polyelectrolytes is that the position of the intermediate plateau lies at 2/3 of the total ionizable groups. The intermediate plateau results from the stability of an onion-like structure where all odd shells of the dendrimer are protonated, while the even shells remain deprotonated. The titration curve features two distinct steps around pH 6 and 10. The Ising model permits a quantitative analysis of this protonation behavior.

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