Abstract
Abstract The standard ( p o = 0.1 MPa) molar enthalpy of formation of crystalline uridine, (C 9 H 12 N 2 O 6 ), was determined from its specific energy of combustion, measured by static bomb combustion calorimetry, in oxygen, at T = 298.15 K, as −(1159.8 ± 1.8) kJ mol −1 . Gas-phase standard molar enthalpy of formation of uridine was determined as −(992.8 ± 3.2) kJ mol −1 from quantum-chemical calculations using the G3(MP2) method. The enthalpy of sublimation of uridine at T = 298.15 K, determined as the difference between standard molar enthalpies of formation of uridine in crystalline and gaseous states, was found to be (167.0 ± 3.7) kJ mol −1 .
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