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Experimental data for CH3CH(NH2)COOH (Alanine)

22 02 02 11 45
Other names
α-Alanine; α-Aminopropionic acid; (S)-2-Aminopropanoic acid; (S)-Alanine; Alanine; Alanine, L-; L-(+)-Alanine; L-α-Alanine; L-α-Aminopropionic acid; L-2-Aminopropanoic acid; L-2-Aminopropionic acid; L-Alanine; L-CH3CH(NH2)COOH; Propanoic acid, 2-amino-; Propanoic acid, 2-amino-, (S)-; Ala; alpha-Alanine; alpha-Aminopropionic acid; 2-aminopropanoic acid;
INChI INChIKey SMILES IUPAC name
InChI=1S/C3H7NO2/c1-2(4)3(5)6/h2H,4H2,1H3,(H,5,6)/t2-/m0/s1 QNAYBMKLOCPYGJ-UWTATZPHSA-N CC(N)C(O)=O 2-aminopropanoic acid
InChI=1/C3H7NO2/c1-2(4)3(5)6/h2H,4H2,1H3,(H,5,6)/t2-/m1/s1/f/h5H QNAYBMKLOCPYGJ-FIXCMCSDNA-N CC(N)C(O)=O 2-aminopropanoic acid
State Conformation
1A C1
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Hfg(298.15K) enthalpy of formation -414.70 4.20 kJ mol-1 webbook
Hfg(0K) enthalpy of formation   4.20 kJ mol-1 webbook
Entropy (298.15K) entropy     J K-1 mol-1  
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity     kJ mol-1  
Information can also be found for this species in the NIST Chemistry Webbook
Vibrational levels (cm-1) vibrations
Mode Number Symmetry Frequency Intensity Comment Description
Fundamental(cm-1) Harmonic(cm-1) Reference (km mol-1) unc. Reference

Calculated vibrational frequencies for CH3CH(NH2)COOH (Alanine).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
0.16899 0.10344 0.07552 1993God/Fir:9687

Calculated rotational constants for CH3CH(NH2)COOH (Alanine).
Product of moments of inertia moments of inertia
3629088amu3Å6   1.6617493482279E-113gm3 cm6
Geometric Data
picture of Alanine

Point Group C1


Internal coordinates
distances (r) in Å, angles (a) in degrees, dihedrals (d) in degrees
Description Value unc. Connectivity Reference Comment
Atom 1 Atom 2 Atom 3 Atom 4
rCN 1.471   1 3 1995Kuchitsu(II/23)
rCC 1.544   3 4 1995Kuchitsu(II/23) to C with 2O
rCO 1.192   4 6 1995Kuchitsu(II/23)
rCO 1.347   4 5 1995Kuchitsu(II/23)
rCC 1.509   2 3 1995Kuchitsu(II/23) to end C
aCCN 110.1 1 3 4 1995Kuchitsu(II/23)
aCCO 125.6 3 4 5 1995Kuchitsu(II/23)
aCCO 110.3 3 4 6 1995Kuchitsu(II/23)
aCCC 111.6 2 3 4 1995Kuchitsu(II/23)

Cartesians
Atom x (Å) y (Å) z (Å)

Atom - Atom Distances bond lengths
Distances in Å
 

Calculated geometries for CH3CH(NH2)COOH (Alanine).

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-C 4
H-N 2
H-O 1
C-C 2
C-N 1
C-O 1
C=O 1

Connectivity
Atom 1 Atom 2
N1 C3
N1 H7
N1 H8
C2 C3
C2 H9
C2 H10
C2 H12
C3 C4
C3 H11
C4 O5
C4 O6
O5 H13
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   1A

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
8.880       webbook
Dipole, Quadrupole and Polarizability
Electric dipole moment dipole
State Config State description Conf description Exp. min. Dipole (Debye) Reference comment Point Group Components
x y z total dipole quadrupole
1 1 1A C1 True           C1 3 5
Experimental dipole measurement abbreviations: MW microwave; DT Dielectric with Temperature variation; DR Indirect (usually an upper limit); MB Molecular beam
Calculated electric dipole moments for CH3CH(NH2)COOH (Alanine).
Electric quadrupole moment quadrupole
State Config State description Conf description Exp. min. Quadrupole (D Å) Reference comment Point Group Components
xx yy zz dipole quadrupole
1 1 1A C1 True       C1 3 5

Calculated electric quadrupole moments for CH3CH(NH2)COOH (Alanine).

References
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squib reference DOI
1993God/Fir:9687 PD Godfrey, S Firth, LD Hatherley, RD Brown, AP Pierlot, " Millimeter-Wave Spectroscopy of Biomolecules: Alanine" J. Am. Chem. Soc. 1993, 115, 9687-9691 10.1021/ja00074a039
1995Kuchitsu(II/23) Kuchitsu (ed.), Landolt-Bornstein: Group II: Molecules and Radicals Volume 23: Structure Data for Free Polyatomic Molecules. Springer. Berlin. 1995  
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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