Vapor pressures of triethylamine + chloroform and of diethyl ether + chloroform were measured at 298.15 K with a calibrated quartz spiral. The ideal associated solution model has been used to determine the equilibrium constants and standard enthalpies of formation of the complexes from the thermodynamic properties derived from the vapor pressure measurements and from earlier calorimetric measurements. These complex formation constants are compared with values obtained by calorimetric and spectroscopic methods.