Compound Information 

Name: 2,4,6-(1H,3H,5H)-pyrimidinetrione
Formula: C4H4N2O3
Molar Mass: 128.087
Additional Names: 2,4,6-trioxohexahydropyrimidine
2,4,6-trihydroxypyrimidine
malonylurea
hydrouracil, 6-hydroxy-
2,4,6-pyrimidinetrione
barbituric acid
2,4,6-pyrimidinetriol
6-hydroxyuracil
pyrimidinetrione
urea, N,N'-(1,3-dioxo-1,3-propanediyl)-
Image of 2,4,6-(1H,3H,5H)-pyrimidinetrione
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Property Availability 

For this compound, WTT contains critically evaluated recommendations for:
(Please note that if more than 50 points are used for regression, only the 50 most-constraining points are reported)

  • Normal boiling temperature (Liquid and Gas)
    • Critical temperature (Liquid and Gas)
      • Critical pressure (Liquid and Gas)
        • Boiling temperature (Liquid in equilibrium with Gas) as a function of Pressure
          Pressure from 6.09464 kPa to 6127.42 kPa
          • Phase boundary pressure
            • Phase boundary pressure (Crystal 1 in equilibrium with Gas) as a function of Temperature
              Temperature from 403.8 K to 479 K
              16 experimental data points
            • Phase boundary pressure (Liquid in equilibrium with Gas) as a function of Temperature
              Temperature from 479 K to 809 K
          • Critical density (Liquid and Gas)
            • Density
              • Density (Liquid in equilibrium with Gas) as a function of Temperature
                Temperature from 479 K to 809 K
              • Density (Gas) as a function of Temperature and Pressure
                Temperature from 414.703 K to 796.05 K
                Pressure from 0.0008 kPa to 819.438 kPa
              • Density (Gas in equilibrium with Liquid) as a function of Temperature
                Temperature from 646.734 K to 809 K
            • Enthalpy of vaporization or sublimation (Liquid to Gas) as a function of Temperature
              Temperature from 480 K to 809 K
              • Heat capacity at saturation pressure (Crystal 1 in equilibrium with Gas) as a function of Temperature
                Temperature from 0.0004 K to 450 K
                50 experimental data points
                • Heat capacity at constant pressure (Ideal Gas) as a function of Temperature
                  Temperature from 298 K to 1000 K
                  • Enthalpy
                    • Enthalpy (Crystal 1 in equilibrium with Gas) as a function of Temperature
                      Temperature from 0.0004 K to 450 K
                      24 experimental data points
                    • Enthalpy (Ideal Gas) as a function of Temperature
                      Temperature from 298 K to 1000 K
                  • Entropy
                    • Entropy (Crystal 1 in equilibrium with Gas) as a function of Temperature
                      Temperature from 0.0004 K to 450 K
                      24 experimental data points
                    • Entropy (Ideal Gas) as a function of Temperature and Pressure
                      Temperature from 298 K to 1000 K
                  • Viscosity (Gas) as a function of Temperature and Pressure
                    Temperature from 570 K to 1210 K
                    • Thermal conductivity (Gas) as a function of Temperature and Pressure
                      Temperature from 570 K to 1210 K
                      • Enthalpy of formation (Crystal)
                        2 experimental data points

                        About WTT 

                        NIST/TRC Web Thermo Tables (WTT)
                        NIST Standard Reference Subscription Database 3 - Professional Edition
                        Version 2-2012-1-Pro

                        This web application provides access to a collection of critically evaluated thermodynamic property data for pure compounds with a primary focus on organics. These data were generated through dynamic data analysis, as implemented in the NIST ThermoData Engine software package [1, 2, 3, 4, 5, 6]. Some critically evaluated data from the historical TRC Thermodynamic Tables archive [7, 8] are included, also. As of May 2012, the Professional Edition contains information on 28432 compounds and total of 531486 evaluated data points. The properties covered by both versions (32 total) are described in Properties and Implemented Models.

                        Developed by Kenneth Kroenlein, Chris D. Muzny, Andrei F. Kazakov, Vladimir Diky, Robert D. Chirico, Joseph W. Magee, Ilmutdin Abdulagatov and Michael Frenkel.

                        Thermodynamics Research Center (TRC)
                        Thermophysical Properties Division
                        National Institute of Standards and Technology
                        Boulder CO 80305-3337

                        Questions and comments should be addressed to Dr. Michael Frenkel .

                        DISCLAIMER: The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high-quality copy of the database and to verify that the methods and data contained therein have been selected on the basis of sound scientific judgement. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the program and database.

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                        Standard Reference Data Program
                        National Institute of Standards and Technology
                        Gaithersburg MD 20899

                        Compound Information
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