Abstract
Distribution equilibria of aniline derivatives, such as toluidine (T), nitroaniline (NA) andnitro-N, N-dimethylaniline (NDA) isomers, between nonaqueous solvents and a macroreticularsulfonic acid resin were investigated bver a wide range of concentration. These bases weredistributed onto the resin by acid-base equilibria, RSO3-H B RSOs-BH, which obeyed ac/lassical mass action law expression in nonpolar as well as polar solvents. The observed equilibrium constants (K) were related to the acid dissociation constants (Ka) of bases in waterthrough the following equations.The slope of a plot of log K vs. PKa(ei, o) was regarded as a measure of relative strength ofbases for the sulfonic acid resin in nonaqueous media The K value was affected by strengthand structure of bases and properties of solvents.On the basis of these results, chromatographic separation of aniline derivatives were performedin nonaqueous media. NA and NDA isomers were successfully separated using pure or mixedsolvents as eluate which allowed to change the acid-base equilibrium.
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