HYDROPHOBIC AND HYDROPHILIC INTERACTIONS IN BINARY-MIXTURES OF ALPHA-PICOLINE WITH WATER

The ultrasound velocity in and the density of aqueous solutions of alp ha-picoline were measured in the whole concentration range and within the temperature limits 293-298 K. The viscosity of the solutions was m easured at 293 K. The molar compressibility, molar volume and the corr esponding excesses and partial functions as well as the coefficients o f adiabatic compressibility and the excess Gibbs energy of viscous flo w were calculated. The results are discussed in terms of hydrophobic a nd hydrophilic interactions. In dilute solutions of picoline the hydro phobic Hydration leads to a structure resembling that of the solid cla thrate II, while at higher concentrations the hydrophobic association and hydrophilic hydration becomes more pronounced.