Deuterium Isotope Effect on Excess Enthalpies of Methanol or Ethanol and Their Deuterium Derivatives at 298.15 K |
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Authors: | Kimura T Matsushita T Ueda K Tamura K Takagi S |
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Institution: | (1) Department of Chemistry, Kinki University, 3-4-1 Kowakae, Higashi-osaka 577-8502, Japan;(2) Department of Chemistry, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan |
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Abstract: | Excess enthalpies of six binary mixtures of CH3 OD+CH3 OH, CH3 OD+CD3 OD, CD3 OD+CH3 OH, C2 D5 OD+C2 H5 OH, C2 D5 OD+C2 H5 OD, C2 H5 OD+C2 H5 OH have been determined over the whole range of mole fractions at 298.15 K in order to know the isotopic effect on hydrogen-bonding
accurately, although there are many reports on the differences in the strength of hydrogen-bonding between OH and OD.
All excess enthalpies measured are very small and endothermic. The mixtures of CH3 OD+ CH3 OH, and C2 D5 OD+C2 H5 OH showed the largest excess enthalpies among each methanol and ethanol mixtures. The difference of intermolecular interaction
between OH and OD in methanol and ethanol was almost same value of (1.82±0.04) J mol-1
Excess enthalpies of 1,4-dimethylbenzene+1,3-dimethylbenzene and 1,4-dimethylbenzene+1,2-methylbenzene were measured by three
different principle calorimeters at 298.15 K in order to know the precision of calorimetry for a small enthalpy change.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | deuterium isotope effect ethanol ethanol-d 1 ethanol-d 6 excess enthalpy methanol methanol-d 1 methanol-d 4 |
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