Free energy of transfer ofn-nitroalkanes fromn-octane to water at 25°C

Calorimetric determinations of the thermodynamics of transfer of nitromethane, nitroethane, 1-nitrobutane, 1-nitropentane, and 1-nitrohexane from n-octane to water at 25°C have been made. Transfer free energies calculated by four different models agree reasonably well with observations. Calculations indicate that the dipolar part of the transfer free energy depends only on the dipole moment and size of the-C?NO₂ group and is independent of the length of the alkyl chain in nitroalkanes.