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D2O-H2O solvent isotope effects on the enthalpies of bicaret hydration and dilution of its aqueous solutions at different temperatures
被引：9
作者：
Ivanov, Evgeniy V.
[1
]
Batov, Dmitriy V.
[2
,3
]
Gazieva, Galina A.
[4
]
Kravchenko, Angelina N.
[4
]
Abrosimov, Vladimir K.
[1
]
机构：
[1] Russian Acad Sci, GA Krestov Inst Solut Chem, Lab Thermodynam Solut Nonelectrolytes & Biol Act, Ivanovo 153045, Russia
[2] Russian Acad Sci, GA Krestov Inst Solut Chem, Inc Physicochem Ctr Solut Res, Ivanovo 153045, Russia
[3] Ivanovos State Univ Chem & Technol, Ivanovo 153000, Russia
[4] Russian Acad Sci, ND Zelinskii Organ Chem Inst, Lab Nitrogen Containing Cpds, Moscow 199119, Russia
基金：
俄罗斯基础研究基金会;
关键词：
Enthalpies of solution;
Enthalpies of dilution;
Enthalpy-related interaction coefficients;
2,4,6,8-Tetraethyl-2,4,6,8-tatraazabicyclo[3.3.0]octane-3,7-dione (bicaret);
Ordinary and heavy water;
Solvent isotope effects;
APPARENT MOLAL VOLUMES;
BIS-UREA MEBICARUM;
THERMODYNAMIC PROPERTIES;
INTERMOLECULAR INTERACTIONS;
HEAVY-WATER;
MIXTURES;
CAPACITIES;
EXCESS;
AMIDES;
LIGHT;
D O I：
10.1016/j.tca.2014.05.011
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The molar enthalpies of solution of bicaret or 2,4,6,8-tetraethyl-2,4,6,8-tatraazabicyclo[3.3.0]octane-3,7-dione in ordinary (H2O) and heavy (D2O) water at (278.15, 288.15, 298.15, 308.15, and 318.15) K as well as the enthalpies for dilution of its H/D isotopically distinguishable aqueous solutions at 298.15 K were measured calorimetrically. The standard (at infinite dilution) molar enthalpies and heat capacities of solution, and the enthalpic coefficients for pair (h(22)) and triplet (h(222)) interactions between hydrated solute molecules, along with D2O-H2O solvent isotope effects (IEs) on the studied quantities were computed. The enthalpic effects of bicaret dissolution and corresponding IEs were found to be negative and decreasing in magnitude with increasing temperature. On the contrary, the h(22) and h(222) values as well as IEs on them were found to be positive. These facts indicate that the bicaret hydration being predominantly hydrophobic is enhanced in the D2O medium. The hydration behavior of the solute considered was discussed in comparison with that for mebicar or 2,4,6,8-tetramethyl-2,4,6,8-tatraazabicyclo[3.3.0]octane-3,7-dione using the previously obtained data. (C) 2014 Elsevier B.V. All rights reserved.
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页码：145 / 150
页数：6
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