Thermochemical study of 5-methyluracil, 6-methyluracil, and 5-nitrouracil

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• 作者：Manuel A.V. Ribeiro da Silva  ; ;   ; ^{risilva@fc.up.pt} ; Luí ; sa M.P.F. Amaral ; Piotr Szterner
• 关键词：Combustion calorimetry ; Energy of combustion ; Enthalpy of formation ; 5-Methyluracil ; 6-Methyluracil ; 5-Nitrouracil
• 刊名：Journal of Chemical Thermodynamics
• 出版年：2011
• 出版时间：December 2011
• 年：2011
• 卷：43
• 期：12
• 页码：1924-1927
• 全文大小：197 K

文摘

The standard (p¡ã = 0.1 MPa) molar enthalpies of formation, in the crystalline phase, at T = 298.15 K, for 5-methyluracil, 6-methyluracil, and 5-nitrouracil were derived from the values of the standard massic energies of combustion measured by static bomb combustion calorimetry. The results obtained together with literature values of the enthalpies of sublimation yielded the standard molar enthalpies of formation, in gaseous phase, at T = 298.15 K. These values are discussed in the terms of structural enthalpic increments.