HYDROGEN ISOTOPE FRACTIONATION BETWEEN METHANOL AND DIPHENYLPHOSPHINEOR DIMETHYLPHOSPHINE IN THE GAS-PHASE AND IN APROTIC-SOLVENTS

D/H fractionation factors between MeOH and Ph(2)PH in dilute solutions of tetrachloroethylene, benzene, tetrahydrofuran, pyridine, and aceto nitrile and T/H fractionation factors between MeOH and Me(2)PH vapors were measured. The experimental results agree very well with values ca lculated from the statistical theory of isotope effects formulated by Bigeleisen and Mayer. There are correlations between observed fraction ation factors and solvent polarity, and the interaction energy of meth anol with the given solvent. Another correlation has been found betwee n enthalpy of the exchange reactions and the interaction energy betwee n methanol and the given solvent.