Low-Temperature Heat Capacities and Standard Molar Enthalpy of Formation of l-3-(3,4-Dihydroxyphenyl) Alanine (C9H11NO4)
Abstract
Low-temperature heat capacities of l-3-(3,4-dihydroxyphenyl) alanine (C9H11NO4) were measured by a precision automated adiabatic calorimeter over the temperature range from (78 to 400) K. A polynomial equation of heat capacities as a function of temperature was fitted by the least-squares method. Based on the fitted polynomial, the smoothed heat capacities and thermodynamic functions of the compound relative to the standard reference temperature 298.15 K were calculated and tabulated at 5 K intervals. The constant-volume energy of combustion of the compound at T = 298.15 K was measured by a precision oxygen-bomb combustion calorimeter to be ΔcU = −(21183.5 ± 35.0) J·g−1. The standard molar enthalpy of combustion of the compound was determined to be ΔcH°m = −(4177.8 ± 6.9) kJ·mol−1, according to the definition of combustion enthalpy. Finally, the standard molar enthalpy of formation of the compound was calculated to be ΔfH°m = −(935.9 ± 7.0) kJ·mol−1 in accordance with Hess law.
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