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Experimental data for CH3CH2NH2 (Ethylamine)

22 02 02 11 45
Other names
1-Aminoethane; Aethylamine; Aminoethane; Ethanamine; Ethylamine; Etilamina; Etyloamina; Monoethylamine;
INChI INChIKey SMILES IUPAC name
InChI=1S/C2H7N/c1-2-3/h2-3H2,1H3 QUSNBJAOOMFDIB-UHFFFAOYSA-N CCN Ethanamine
State Conformation
1A' CS trans
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 -47.50   kJ mol-1 TRC
Hfg(0K) enthalpy of formation -26.70   kJ mol-1 TRC
Entropy (298.15K) entropy 283.78   J K-1 mol-1 TRC
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity 15.25   kJ mol-1 TRC
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
1 A' 3345   1999Zer/Jen:119      
2 A' 2985   1999Zer/Jen:119      
3 A' 2840   1999Zer/Jen:119      
4 A' 2860   1999Zer/Jen:119      
5 A' 1622   1999Zer/Jen:119      
6 A' 1487   1999Zer/Jen:119      
7 A' 1465   1999Zer/Jen:119      
8 A' 1378   1999Zer/Jen:119      
9 A' 1397   1999Zer/Jen:119      
10 A' 1016   1999Zer/Jen:119      
11 A' 1086   1999Zer/Jen:119      
12 A' 892   1999Zer/Jen:119      
13 A' 773   1999Zer/Jen:119      
14 A' 403   1999Zer/Jen:119      
15 A" 3412   1999Zer/Jen:119      
16 A" 2924   1999Zer/Jen:119      
17 A" 2906   1999Zer/Jen:119      
18 A" 1455   1999Zer/Jen:119      
19 A" 1238   1999Zer/Jen:119      
20 A" 1293   1999Zer/Jen:119      
21 A" 1117   1999Zer/Jen:119      
22 A" 816   1999Zer/Jen:119      
23 A" 259   1999Zer/Jen:119      
24 A" 218   1999Zer/Jen:119      

vibrational zero-point energy: 19593.5 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for CH3CH2NH2 (Ethylamine).
Gas-phase IR spectra can be found in the NIST Chemistry Webbook here.
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
1.05934 0.29184 0.26014 1982Fis/Bot:116

Calculated rotational constants for CH3CH2NH2 (Ethylamine).
Product of moments of inertia moments of inertia
59565.42amu3Å6   2.72748381047203E-115gm3 cm6
Geometric Data
picture of Ethylamine

Point Group


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
rNH 1.052   1 9 1992Kuchitsu(II/21) !assumed, average
rCH 1.107   2 7 1992Kuchitsu(II/21) average
rCN 1.475   1 2 1992Kuchitsu(II/21)
rCC 1.531   2 3 1992Kuchitsu(II/21)
aHNC 111.1 2 1 9 1992Kuchitsu(II/21)
aHCC 113.2 2 3 4 1992Kuchitsu(II/21) average
aCCN 115 1 2 3 1992Kuchitsu(II/21)

These cartesians were determined using some assumed coordinate values. Cartesians
Atom x (Å) y (Å) z (Å)

Atom - Atom Distances bond lengths
Distances in Å
 

Calculated geometries for CH3CH2NH2 (Ethylamine).

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-C 5
H-N 2
C-C 1
C-N 1

Connectivity
Atom 1 Atom 2
N1 C2
N1 H9
N1 H10
C2 C3
C2 H7
C2 H8
C3 H4
C3 H5
C3 H6
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
8.900   9.500   webbook

Proton Affinity (kJ mol-1)
Proton Affinity unc. Product reference comment
912.0   CH3CH2NH3+ 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' CS trans False       1.220 NSRDS-NBS10 DT Cs 2 3
1 2 1A C1 gauche True          
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 CH3CH2NH2 (Ethylamine).
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' CS trans False       Cs 2 3
1 2 1A C1 gauche True      

Calculated electric quadrupole moments for CH3CH2NH2 (Ethylamine).
Electric dipole polarizability (Å3) polarizability
alpha unc. Reference
5.870   1998Gus/Rui:163

Calculated electric dipole polarizability for CH3CH2NH2 (Ethylamine).

References
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squib reference DOI
1982Fis/Bot:116 E Fischer, I Botskor "THE MICROWAVE-SPECTRUM OF TRANS-ETHYLAMINE" J. Mol. Spect. 91(1) 116-127, 1982 10.1016/0022-2852(82)90035-2
1992Kuchitsu(II/21) Kuchitsu (ed.), Landolt-Bornstein: Group II: Atomic and Molecular Physics Volume 21: Structure Data of Free Polyatomic Molecules. Springer-Verlag, Berlin, 1992.  
1998Gus/Rui:163 M Gussoni, R Rui, G Zerbi "Electronic and relaxation contribution to linear molecular polarizability. An analysis of the experimental values" J. Mol. Struct. 447 (1998) 163-215 10.1016/S0022-2860(97)00292-5
1999Zer/Jen:119 Zeroka, Jensen, and Samuels. Infrared spectra of some isotopomers of ethylamine and ithe ethylammonium ion: a theoretical study. J. Mol. Struct. (Theochem). Vol. 465. pgs. 119-139. 10.1016/S0166-1280(98)00324-8
NSRDS-NBS10 R. D. Nelson Jr., D. R. Lide, A. A. Maryott "Selected Values of electric dipole moments for molecules in the gas phase" NSRDS-NBS10, 1967 10.6028/NBS.NSRDS.10
TRC Frenkel, M; Marsh, K.N.; Wilhoit, R.C.; Kabo, G.J.; Roganov, G.N.,Thermodynamics of Organic Compounds in the Gas State,Thermodynamics Research Center, College Station, TX, 1994  
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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