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 constantvolume energy of combustion of the compound at T ) 298.15 K was measured by a precision oxygenbomb combustion calorimeter to be AcU ) -(21183.5 ( 35.0) J * g-1. The standard molar enthalpy of combustion of the compound was determined to be AcHdeg 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 AfHdeg m ) -(935.9 ( 7.0) kJ * mol-1 in accordance with Hess law.
Compounds
#
Formula
Name
1
CO2
carbon dioxide
2
N2
nitrogen
3
H2O
water
4
O2
oxygen
5
C9H11NO4
L-3,4-dihydroxyphenylalanine
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.
Type
Compound-#
Property
Variable
Constraint
Phase
Method
#Points
POMD
5
Normal melting temperature, K ; Crystal
Crystal
Liquid
Air at 1 atmosphere
VISOBS
1
POMD
5
Molar heat capacity at constant pressure, J/K/mol ; Crystal
Temperature, K; Crystal
Pressure, kPa; Crystal
Crystal
VADIAC:UFactor:4
137
RXND
5
1
2
3
4
Specific internal energy of reaction at constant volume, J/g