کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
215554 1426238 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enthalpy of formation of 5-fluoro-1,3-dimethyluracil: 5-Fluorouracil revisited
ترجمه فارسی عنوان
انطباق تشکیل 5-فلورو-1،3-دی متیلورازیل: 5-فلوراواتوریل مجددا
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Enthalpies of formation measured by rotating bomb combustion calorimetry.
• Sublimation enthalpies determined by the Knudsen mass-loss effusion technique.
• Quantum chemical calculations allowed estimation of ΔfHmo (g).
• New values of enthalpies of formation for 5-fluorouracil are recommended.

In the present work, a re-determination of thermochemical data for 5-fluorouracil was performed and a new determination of thermochemical parameters for 5-fluoro-1,3-dimethyluracil are presented. The standard (po = 0.1 MPa) molar enthalpies of formation, in the crystalline phase, of 5-fluorouracil and 5-fluoro-1,3-dimethyluracil, at T = 298.15 K, were derived from the standard molar energies of combustion in oxygen, measured by rotating bomb combustion calorimetry. For these compounds, the standard molar enthalpies of sublimation, at T = 298.15 K, were determined from the temperature-vapour pressure dependence, obtained by the Knudsen mass-loss effusion method. Using the values for the heat capacity differences between the gas and the crystalline phases of the compounds studied, the standard (po = 0.1 MPa) molar enthalpies, entropies and Gibbs free energies of sublimation, at T = 298.15 K, were derived. From the experimentally determined values, the standard molar enthalpies of formation, in the gas phase, at T = 298.15 K, of 5-fluorouracil and 5-fluoro-1,3-dimethyluracil were calculated as −(454.5 ± 1.6) and −(478.5 ± 1.3) kJ · mol−1, respectively. These values were compared with estimates obtained from very accurate theoretical calculations using the G3(MP2)//B3LYP composite method and appropriately chosen reactions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Chemical Thermodynamics - Volume 75, August 2014, Pages 106–115
نویسندگان
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