
%0 Journal Article
%A Bolton, PD 
%A Hall, FM 
%T Substituent effects on the thermodynamic functions of ionization of metasubstituted anilinium ions
%J Australian Journal of Chemistry
%D 1968/04/01
%V 21
%N 4
%P 939-946
%K 
%R https://doi.org/10.1071/CH9680939
%U https://www.publish.csiro.au/paper/CH9680939 
%X Thermodynamic acidity constants of the meta-methoxyanilinium, meta-   chloroanilinium, meta-bromoanilinium, and meta-iodoanilinium ions have been measured spectrophotometrically over the temperature range 5-50º and those of the meta-nitroanilinium ion over the temperature range 5-60º. The thermodynamic functions of ionization, &#916;G25, &#916;H25, &#916;S25, and &#916;Cp,25, have also been calculated for each ion. For a series of seven meta-substituted anilinium ions the acidity constants show close obedience to the Hammett equation over the temperature range 10-50º with the reaction parameter p being a precise linear function of 1/T. The same reaction series also shows a well-defined isoequilibrium relationship of negative slope. 
