ACTIVATION THERMODYNAMIC PARAMETERS OF BINARY-MIXTURES OF PROPIONIC-ACID AND O-SUBSTITUTED ANILINES

Variations of densities and viscosities with temperature and compositi on are reported for binary liquid mixtures containing propionic acid aniline (I), + o-toluidine (II), + o-anisidine (III), and + o-chloroa niline (IV). Entropies DELTAS(double-dagger)m and enthalpies DELTAH(do uble-dagger)m of activation as functions of the composition of the mix tures, as well as free energies of activation DELTAG(double-dagger)m a t 10, 20, 30, 40, and 50-degrees-C and different compositions were cal culated by means of Eyring's equation. The formation of activated comp lexes between the components of these binary mixtures is postulated an d claimed to result from acid-base and hydrogen bonding exchange inter actions.