Compound Information 

Name: (S)-2-amino-4-methylpentanoic acid
Formula: C6H13NO2
Molar Mass: 131.175
Additional Names: L-leucine
leucine
L-(+)-leucine
leucine, L-
(S)-(+)-leucine
(S)-leucine
L-.alpha.-aminoisocaproic acid
.alpha.-amino-.gamma.-methylvaleric acid
pentanoic acid, 2-amino-4-methyl-, (S)-
(S)-2-amino-4-methylvaleric acid
L-norvaline, 4-methyl-
.alpha.-aminoisocaproic acid
Image of (S)-2-amino-4-methylpentanoic acid

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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)

  • Triple point temperature (Crystal 2, Crystal 1, and Gas)
    1 experimental data points
    • Phase boundary pressure (Crystal 1 in equilibrium with Gas) as a function of Temperature
      Temperature from 420.7 K to 517.5 K
      9 experimental data points
      • Critical density (Liquid and Gas)
        • Enthalpy of phase transition (Crystal 2 to Crystal 1 in equilibrium with Gas)
          1 experimental data points
          • Heat capacity at saturation pressure (Crystal 2 in equilibrium with Gas) as a function of Temperature
            Temperature from 0.0003 K to 310.131 K
            50 experimental data points
            • Heat capacity at constant pressure (Ideal Gas) as a function of Temperature
              Temperature from 200 K to 1000 K
              • Enthalpy
                • Enthalpy (Crystal 2 in equilibrium with Gas) as a function of Temperature
                  Temperature from 0.0003 K to 310.131 K
                • Enthalpy (Ideal Gas) as a function of Temperature
                  Temperature from 200 K to 1000 K
              • Entropy (Crystal 2 in equilibrium with Gas) as a function of Temperature
                Temperature from 0.0003 K to 310.131 K
                39 experimental data points
                • 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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                  National Institute of Standards and Technology
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