Introduction Although devices based on pseudorotaxanes, cantenanes, and rotaxanes are commercialized yet, several researches have been done on the applications of these donor-acceptor molecules. A promising area is the field of nanotechnology. The miniaturization of semi-conductor technology by the ＂top-down＂ approach is limited by the wavelength of the radiation used in the lithography to prepare electronic components. Therefore, the ＂bottom-up＂ may be more suitable to create devices with sizes down to the molecular level. A molecular or supramolecular system, in which the relative position of the component parts can be altered by an external stimulus, a molecular switch, can act as the basic unit for the creation of new molecular devices .
XI Hai-taoSUN Xiao-qiangCHEN JuanMENG QiPAN YiHU Hong-wen
By measuring the vapor-liquid equilibrium of ethanol-hexamethylene-NaI and testing the data using the ternary Gibbs-Duhem equation,the experimental results of the vapor-liquid equilibrium with thermodynamics consistency are obtained.Applying the Pitzer equation of the activity coefficients of 1-1 type electrolyte to non-aqueous mixed solvents,each parameter of the equation was obtained by the method of least squares.The calculation results show that the activity coefficients of NaI in ethanol-hexamethylene system with constant composition decrease as its concentration increases.This method is adapted to determination of electrolytical activity coefficients in non-aqueous solvents.
