The infinite-dilution activity coefficients (gamma(infinity)) of paraffins, olefins, chloroparaffins, aromatics, alcohols, ethers, and acetates were measured by medium-pressure gas liquid chromatography (GLC) in alkanediamines: octane-1,8-diamine, decane1,10-diamine, and dodecane-1,12-diamine at temperatures from (328.15 to 363.15) K. The present measurements show good agreement with available literature data. The partial molar excess enthalpies at infinite dilution, Delta H(i)(E,infinity), were calculated from the experimental gamma(infinity)(i) values obtained over the temperature range. In order to determine the different interactions between the solutes and solvents, the linear solvation energy relationship (LSER) or "Abraham method" was applied.