THE ROLE OF HYDROPHILIC INTERACTIONS IN DETERMINING PREFERENTIAL CONFIGURATIONS IN AQUEOUS-SOLUTION - ALKAN-1-OLS, ALKAN-1,2-DIOLS, ALKAN-ALPHA,OMEGA-DIOLS, AND ALPHA-AMINO-ACIDS INTERACTING WITH GLYCINE AND ITS OLIGOMERS AT 298.15-K

Enthalpies of dilution of ternary aqueous solutions containing glycine , diglycine or triglycine and alkan-1-ols, alkan-1,2-diols, alkan-alph a,omega-diols, and alpha-aminoacids have been determined by microcalor imetry at 298.15 K. Pairwise cross interaction coefficients of the vir ial expansion of the excess enthalpies were evaluated. The values of t hese coefficients are positive, depending in a very complex manner on the number and position of the hydroxyl groups. The behaviour of these systems seems to be determined by a balance between favourable hydrop hilic-hydrophilic and repulsive hydrophilic-hydrophobic interactions. The chaotropic agents employed play a major role: they are more comple x than other purely hydrophilic substances, such as urea or biuret, be cause of the presence of hydrophobic domains on their molecules.