Enthalpies of the dissolution of D-valine in the mixtures of water with formamide (FA), N-methylformamide (MFA), N,N-dimethylformamide (DMF) and N,N-dimethylacetamide (DMA) with the mole fraction (x(2)) of amides ranging up to 0.3 have been measured at T = 298.15 K. The standard enthalpies of the dissolution (Delta H-sol degrees) and the transfer enthalpies (Delta H-tr degrees) of D-valine have been calculated. On the basis of McMillan-Mayer's theory, the enthalpic coefficients of pairwise interaction (h(xy)) have been calculated. The enthalpic coefficients (h(xy)) of the solute -amide pairwise interaction in the water proved to be positive and increasing in the series: FA < MFA < DMF. It is associated with the increasing of the hydrophobic properties of amides and the energy of intermolecular interactions between components of water+organic mixtures in the same sequence.
