Abstract
An on-line controlled calorimeter has been devised and used for measuring heats of adduct formation of dimethyl sulfoxide (DMSO) with 2, 2, 2-trifluoroethanol (TFE) in 1, 2-dichloroethane (DCE) at 25°C. The observed heats were well explained in terms of the formation of two adducts, (dmso) (tfe) and (dmso) (tfe)2, and their formation constants and enthalpies were simultaneously determined. For the formation of the 1:1 adduct, the formation constant was appreciably smaller and the enthalpy was less negative in DCE than in CCl4, implying that DMSO is more strongly solvated in polar DCE than in nonpolar CCl4.
