Binding of Phosphate,Pyrophosphate,and Hexacyanoferrate(II) by Fully N-Methyl Substituted Polyammonium Cations in Aqueous Solution

摘要

In this study,we determined the stability of some fully N-methyl substituted polycation-inorganic polyanion complexes by potentiometric measurements at t=25 deg C.As for other previously studied similar systems,the stability of ALH_r species (A=amine;L=inorganic polyanion;r=1,2,…m,with m>=n,n=maximum protonation degree of the amine) is a function of the charges involved in the formation equilibrium.The basicity of the polyanion also plays a fairly significant role.The stability of these species is compared with that of analogous species of unsubstituted amines and with that of polyammonium-carboxylate complexes.Simple predictive stability relationships are given.