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Experimental data for N(CH3)3 (Trimethylamine)

22 02 02 11 45
Other names
Methanamine, N,N-dimethyl-; Methylamine, N,N-dimethyl-; TMA; Trimethylamine;
INChI INChIKey SMILES IUPAC name
InChI=1S/C3H9N/c1-4(2)3/h1-3H3 GETQZCLCWQTVFV-UHFFFAOYSA-N CN(C)C Trimethylamine
State Conformation
1A1 C3V
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 -23.60   kJ mol-1 TRC
Hfg(0K) enthalpy of formation     kJ mol-1 TRC
Entropy (298.15K) entropy 288.80   J K-1 mol-1 TRC
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
1 A1 2953   1993Mur/Zer:581      
2 A1 2775   1993Mur/Zer:581      
3 A1 1459   1993Mur/Zer:581      
4 A1 1444   1993Mur/Zer:581      
5 A1 1186   1993Mur/Zer:581      
6 A1 828   1993Mur/Zer:581      
7 A1 367   1993Mur/Zer:581      
8 A2 2977   1993Mur/Zer:581      
9 A2 1453   1993Mur/Zer:581      
10 A2 1046   1993Mur/Zer:581      
11 A2 255   1993Mur/Zer:581      
12 E 2981   1993Mur/Zer:581      
13 E 2953   1993Mur/Zer:581      
14 E 2776   1993Mur/Zer:581      
15 E 1471   1993Mur/Zer:581      
16 E 1444   1993Mur/Zer:581      
17 E 1409   1993Mur/Zer:581      
18 E 1275   1993Mur/Zer:581      
19 E 1103   1993Mur/Zer:581      
20 E 1043   1993Mur/Zer:581      
21 E 424   1993Mur/Zer:581      
22 E 281   1993Mur/Zer:581      

vibrational zero-point energy: 25530.4 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for N(CH3)3 (Trimethylamine).
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

Calculated rotational constants for N(CH3)3 (Trimethylamine).
Product of moments of inertia moments of inertia
amu3Å6   0gm3 cm6
Geometric Data
picture of Trimethylamine

Point Group C3v


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 1.451   1 2 1976Hellwege(II/7)
rCH 1.109   2 8 1976Hellwege(II/7) sides
rCH 1.088   2 5 1976Hellwege(II/7) middle
aCNC 110.9 2 1 3 1976Hellwege(II/7)
aHCN 111.7 1 2 5 1976Hellwege(II/7) to middle H
aHCN 110.1 1 2 8 1976Hellwege(II/7) to side H
aHCH 108.1 5 2 8 1976Hellwege(II/7) side to middle
aHCH 108.6 8 2 9 1976Hellwege(II/7) side to side
dHCCH 120.11 5 2 1 8 from symmetry, anti to sy

Cartesians
Atom x (Å) y (Å) z (Å)
N1 0.0000 -0.0000 -0.3852
C2 -0.9758 -0.9757 0.0634
C3 1.3330 -0.3571 0.0634
C4 -0.3572 1.3328 0.0634
H5 -1.0253 -1.0252 1.1492
H6 1.4006 -0.3752 1.1492
H7 -0.3753 1.4004 1.1492
H8 -1.9833 -0.7091 -0.3156
H9 -0.7093 -1.9833 -0.3156
H10 1.6060 -1.3629 -0.3156
H11 2.0722 0.3776 -0.3156
H12 0.3774 2.0722 -0.3156
H13 -1.3631 1.6057 -0.3156

Atom - Atom Distances bond lengths
Distances in Å
  N1 C2 C3 C4 H5 H6 H7 H8 H9 H10 H11 H12 H13
N1   1.45101.45101.45102.11112.11112.11112.10742.10742.10742.10742.10742.1074
C2 1.4510   2.39022.38991.08802.68082.68061.10901.10902.63803.35643.35622.6376
C3 1.45102.3902   2.39012.68081.08802.68073.35642.63801.10901.10902.63783.3563
C4 1.45102.38992.3901   2.68062.68071.08802.63763.35623.35632.63781.10901.1090
H5 2.11111.08802.68082.6806   2.51152.51121.77861.77863.03043.70243.70233.0300
H6 2.11112.68081.08802.68072.5115   2.51133.70243.03041.77861.77863.03023.7023
H7 2.11112.68062.68071.08802.51122.5113   3.03003.70233.70233.03021.77861.7786
H8 2.10741.10903.35642.63761.77863.70243.0300   1.80193.64844.19863.64802.3964
H9 2.10741.10902.63803.35621.77863.03043.70231.8019   2.39703.64844.19853.6480
H10 2.10742.63801.10903.35633.03041.77863.70233.64842.3970   1.80193.64824.1985
H11 2.10743.35641.10902.63783.70241.77863.03024.19863.64841.8019   2.39673.6482
H12 2.10743.35622.63781.10903.70233.03021.77863.64804.19853.64822.3967   1.8019
H13 2.10742.63763.35631.10903.03003.70231.77862.39643.64804.19853.64821.8019  

Calculated geometries for N(CH3)3 (Trimethylamine).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle         atom1 atom2 atom3 angle
N1 C2 H5 111.700 N1 C2 H8 110.100
N1 C2 H9 110.100 N1 C3 H6 111.700
N1 C3 H10 110.100 N1 C3 H11 110.100
N1 C4 H7 111.700 N1 C4 H12 110.100
N1 C4 H13 110.100 C2 N1 C3 110.900
C2 N1 C4 110.884 C3 N1 C4 110.892
H5 C2 H8 108.099 H5 C2 H9 108.099
H6 C3 H10 108.099 H6 C3 H11 108.099
H7 C4 H12 108.099 H7 C4 H13 108.099
H8 C2 H9 108.658 H10 C3 H11 108.658
H12 C4 H13 108.658

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-C 9
C-N 3

Connectivity
Atom 1 Atom 2
N1 C2
N1 C3
N1 C4
C2 H5
C2 H8
C2 H9
C3 H6
C3 H10
C3 H11
C4 H7
C4 H12
C4 H13
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   1A1

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
7.850 0.050 8.540   webbook

Proton Affinity (kJ mol-1)
Proton Affinity unc. Product reference comment
948.9   (CH3)3NH+ 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 1A1 C3v True       0.612 NSRDS-NBS10 MW C3v 1 1
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 N(CH3)3 (Trimethylamine).
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 1A1 C3v True       C3v 1 1

Calculated electric quadrupole moments for N(CH3)3 (Trimethylamine).
Electric dipole polarizability (Å3) polarizability
alpha unc. Reference
7.076   1997Oln/Can:59

Calculated electric dipole polarizability for N(CH3)3 (Trimethylamine).

References
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squib reference DOI
1976Hellwege(II/7) Hellwege, KH and AM Hellwege (ed.). Landolt-Bornstein: Group II: Atomic and Molecular Physics Volume 7: Structure Data of Free Polyatomic Molecules. Springer-Verlag. Berlin. 1976.  
1993Mur/Zer:581 Murphy, Zerbetto, Duncan, and McKean. Vibrational Spectrum and Harmonic Force Field of Trimethlamine. J. Phys. Chem. Vol. 97, #3, pgs. 581-595. 10.1021/j100105a010
1997Oln/Can:59 TN Olney, NM Cann, G Cooper, CE Brion, Absolute scale determination for photoabsorption spectra and the calculation of molecular properties using dipole sum-rules, Chem. Phys. 223 (1997) 59-98 10.1016/S0301-0104(97)00145-6
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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