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Experimental data for CH3NHCH3 (Dimethylamine)

22 02 02 11 45
Other names
Dimethylamine; DMA; Methanamine, N-methyl-; N-Methylmethanamine;
INChI INChIKey SMILES IUPAC name
InChI=1S/C2H7N/c1-3-2/h3H,1-2H3 ROSDSFDQCJNGOL-UHFFFAOYSA-N CNC Dimethylamine
State Conformation
1A' CS
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 -18.60   kJ mol-1 TRC
Hfg(0K) enthalpy of formation 3.00   kJ mol-1 TRC
Entropy (298.15K) entropy 270.69   J K-1 mol-1 TRC
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity 14.43   kJ mol-1 TRC
Heat Capacity (298.15K) heat capacity 70.50   J K-1 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' 3335   1974sve/kov      
2 A' 2912   1974sve/kov      
3 A' 2855   1974sve/kov      
4 A' 2802   1974sve/kov      
5 A' 1496   1974sve/kov      
6 A' 1496   1974sve/kov      
7 A' 1404   1974sve/kov      
8 A' 1245   1974sve/kov      
9 A' 1155   1974sve/kov      
10 A' 930   1974sve/kov      
12 A' 383   1974sve/kov      
13 A' 230   1974sve/kov      
14 A" 2967   1974sve/kov      
15 A" 2967   1974sve/kov      
16 A" 2802   1974sve/kov      
17 A" 1466   1974sve/kov      
18 A" 1466   1974sve/kov      
19 A" 1404   1974sve/kov      
20 A"     1974sve/kov       1155 questionable assignment?
21 A" 1079   1974sve/kov      
22 A" 1024   1974sve/kov      
23 A"     1974sve/kov       724 questionable assignment?
24 A" 257   1974sve/kov      

Calculated vibrational frequencies for CH3NHCH3 (Dimethylamine).
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
1.14220 0.31135 0.27406 1968Wol/Lau:5058

Calculated rotational constants for CH3NHCH3 (Dimethylamine).
Product of moments of inertia moments of inertia
49154.27amu3Å6   2.25076005977437E-115gm3 cm6
Geometric Data
picture of Dimethylamine

Point Group Cs


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 1.462   1 3 1968Wol/Lau:5058
rNH 1.019   1 2 1968Wol/Lau:5058
rCH 1.084   3 9 1968Wol/Lau:5058 point out
rCH 1.098   3 7 1968Wol/Lau:5058 point up
rCH 1.098   3 5 1968Wol/Lau:5058 point down
aCNC 112.2 3 1 4 1968Wol/Lau:5058
aHCH 109 7 3 9 1968Wol/Lau:5058 out to up
aHCH 109 5 3 9 1968Wol/Lau:5058 out to down
aHCH 107.2 5 3 7 1968Wol/Lau:5058 up to down
aHNC 108.9 2 1 3 1968Wol/Lau:5058
aHCN 109.7 1 3 9 1968Wol/Lau:5058 out H
aHCN 108.2 1 3 7 1968Wol/Lau:5058 up H
aHCN 113.8 1 3 5 1968Wol/Lau:5058 down H

Cartesians
Atom x (Å) y (Å) z (Å)
N1 0.0934 -0.5520 0.0000
H2 -0.6454 -1.2544 0.0000
C3 -0.0220 0.2554 1.2139
C4 -0.0220 0.2554 -1.2139
H5 -0.9221 0.8833 1.2437
H6 -0.9221 0.8833 -1.2437
H7 0.8440 0.9287 1.2609
H8 0.8440 0.9287 -1.2609
H9 -0.0138 -0.3909 2.0843
H10 -0.0138 -0.3909 -2.0843

Atom - Atom Distances bond lengths
Distances in Å
  N1 H2 C3 C4 H5 H6 H7 H8 H9 H10
N1   1.01941.46251.46252.15362.15362.08462.08462.09332.0933
H2 1.0194   2.03512.03512.48862.48862.92822.92822.34282.3428
C3 1.46252.0351   2.42781.09792.69151.09802.70701.08413.3609
C4 1.46252.03512.4278   2.69151.09792.70701.09803.36091.0841
H5 2.15362.48861.09792.6915   2.48741.76683.06501.77633.6775
H6 2.15362.48862.69151.09792.4874   3.06501.76683.67751.7763
H7 2.08462.92821.09802.70701.76683.0650   2.52181.77633.6970
H8 2.08462.92822.70701.09803.06501.76682.5218   3.69701.7763
H9 2.09332.34281.08413.36091.77633.67751.77633.6970   4.1686
H10 2.09332.34283.36091.08413.67751.77633.69701.77634.1686  

Calculated geometries for CH3NHCH3 (Dimethylamine).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle         atom1 atom2 atom3 angle
N1 C3 H5 113.764 N1 C3 H7 108.171
N1 C3 H9 109.675 N1 C4 H6 113.764
N1 C4 H8 108.171 N1 C4 H10 109.675
H2 N1 C3 108.857 H2 N1 C4 108.857
C3 N1 C4 112.207 H5 C3 H7 107.144
H5 C3 H9 108.987 H6 C4 H8 107.144
H6 C4 H10 108.987 H7 C3 H9 108.980
H8 C4 H10 108.980

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-C 6
H-N 1
C-N 2

Connectivity
Atom 1 Atom 2
N1 H2
N1 C3
N1 C4
C3 H5
C3 H7
C3 H9
C4 H6
C4 H8
C4 H10
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
8.240 0.080 8.950   webbook

Proton Affinity (kJ mol-1)
Proton Affinity unc. Product reference comment
929.5   (CH3)2NH2+ 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 True       1.030 NSRDS-NBS10 DT Cs 2 3
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 CH3NHCH3 (Dimethylamine).
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 True       Cs 2 3

Calculated electric quadrupole moments for CH3NHCH3 (Dimethylamine).
Electric dipole polarizability (Å3) polarizability
alpha unc. Reference
5.447   1997Oln/Can:59

Calculated electric dipole polarizability for CH3NHCH3 (Dimethylamine).

References
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squib reference DOI
1968Wol/Lau:5058 JE Wollrab, VW Laurie,"Microwave spectrum of Dimethylamine" J. Chem. Phys. 48(1), 5058, 1968 10.1063/1.1668177
1974sve/kov L.M. Sverdlov, M. A. Kovner, E. P. Krainov, "Vibrational Spectra of Polyatomic Molecules" Wiley, New York 1974  
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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