Solution calorimetry of alkyl substituted ammonium bromides in aqueous and nonaqueous solvents
Enthalpies of solution at infinite dilution of electrolytes in several pure and mixed solvents, aqueous as well as non-aqueous, are discussed. Special attention is given to the peculiar properties of solutions of electrolytes containing alkyl groups, viz. tetraalkylammonium bromides. In water and highly aqueous mixed solvents, the enthalpies of solution of these compounds are strongly influenced by hydrophobic hydration. Attention will be given to the influence of size and nature of the substituting alkyl groups, to the influence of the temperature, and to the role of the cosolvent. Especially in mixtures of water and acetonitrile, the enthalpies of solution of tett'aalkylammonium bromides with large alkyl groups are extremely dependent on solvent composition and temperature.