Collect. Czech. Chem. Commun. 1983, 48, 2368-2375

Dissociation constants of monosubstituted diphenylamines and an optimized construction of acidity function

Oldřich Pytela and Pavel Vetešník

Department of Organic Chemistry, Institute of Chemical Technology, 532 10 Pardubice


Eleven monosubstituted diphenylamines have been synthetized, and concentration ratio of the protonated and free bases has been measured in aqueous sulphuric acid in the concentration range 1.0 . 10-3 to 9.0 mol l-1. An algorithm has been suggested and used for determination of optimized values of pK and H'' acidity function within sulphuric acid concentration range 0.05 to 9.0 mol l-1. The results have been compared with literature data and discussed in terms of theory of acidity functions and linear free energy relationships.