Deuterium Isotope Effect on Excess Enthalpies of Methanol or Ethanol and Their Deuterium Derivatives at 298.15 K

摘要: Excess enthalpies of six binary mixtures CH3 OD+CH3 OH, OD+CD3 OD, CD3 C2 D5 OD+C2 H5 OH have been determined over the whole range mole fractions at 298.15 K in order to know isotopic effect on hydrogen-bonding accurately, although there are many reports differences strength between and OD. All excess measured very small endothermic. The OD+ showed largest among each methanol ethanol mixtures. difference intermolecular interaction OD was almost same value (1.82±0.04) J mol-1 1,4-dimethylbenzene+1,3-dimethylbenzene 1,4-dimethylbenzene+1,2-methylbenzene were by three different principle calorimeters precision calorimetry for a enthalpy change.