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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 (1.820.04) 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.
Abstract
Kinetic parameters characterizing the oxidation of sodium(2-1H2) propionate and the oxidation of sodium (2-2H2) propionate with permanganate in water solutions have been determined and compared with kinetic parameters derived from the investigation of the deuterium isotope effect on the activation parameters in the permanganate and manganate oxidation of sodium (2-3H2) propionate in water solutions of sodium hydroxide.
Abstract
Sodium (2-2H2)valerate has been obtained by exchange technique and the kinetic parameters characterizing the oxidation of both sodium valerate of normal isotopic composition and sodium ,-dideuteriovalerate with manganate in 3M aqueous NaOH solutions have been determined. A discussion of the kinetic deuterium isotope effect observed in the oxidation of CH3CH2CH2CD2COONa is given.
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Determination of the individual specific heat capacities of solids from multi-component powder mixtures and polymorphic mixtures
A combined analysis of quantitative PXRD and calorimetry measurements
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. 10.1016/0021-9614(79)90160-5 . 26. Kimura , T , Matsushita , T , Ueda , K , Tamura , K , Takagi , S . Deuterium isotope effect on excess enthalpies of methanol or ethanol and
.0669 . 8. Kimura , T , Matsushita , T , Ueda , K , Tamura , K , Takagi , S 2001 Deuterium isotope effect on excess enthalpies of methanol or ethanol and their deuterium derivatives at 298.15 K . J Thermal Anal Calorim 64