return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for CH3CH2NH2 (Ethylamine)

using model chemistry: QCISD/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS trans 1A'
1 2 no C1 gauche 1A

Conformer 1 (CS trans)

Jump to S1C2
Energy calculated at QCISD/3-21G
 hartrees
Energy at 0K-133.833005
Energy at 298.15K-133.841185
HF Energy-133.501721
Nuclear repulsion energy81.489935
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at QCISD/3-21G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3356 3253 5.53      
2 A' 3086 2991 37.61      
3 A' 3039 2945 25.69      
4 A' 3016 2923 17.30      
5 A' 1748 1694 15.86      
6 A' 1578 1529 2.55      
7 A' 1562 1514 0.46      
8 A' 1466 1421 3.89      
9 A' 1411 1367 5.86      
10 A' 1174 1138 14.86      
11 A' 1021 990 0.29      
12 A' 904 876 96.01      
13 A' 800 775 134.82      
14 A' 393 381 7.06      
15 A" 3447 3341 5.05      
16 A" 3092 2996 56.87      
17 A" 3066 2971 0.01      
18 A" 1576 1527 6.70      
19 A" 1419 1375 0.29      
20 A" 1318 1278 0.03      
21 A" 1036 1004 1.85      
22 A" 791 767 0.87      
23 A" 316 306 56.58      
24 A" 260 252 8.58      

Unscaled Zero Point Vibrational Energy (zpe) 20435.4 cm-1
Scaled (by 0.9692) Zero Point Vibrational Energy (zpe) 19806.0 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at QCISD/3-21G
ABC
1.02822 0.28278 0.25224

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.327 -0.108 0.000
C2 0.000 0.593 0.000
C3 1.239 -0.352 0.000
H4 2.176 0.224 0.000
H5 1.224 -0.995 0.893
H6 1.224 -0.995 -0.893
H7 0.029 1.243 -0.886
H8 0.029 1.243 0.886
H9 -1.412 -0.704 0.833
H10 -1.412 -0.704 -0.833

Atom - Atom Distances (Å)
  N1 C2 C3 H4 H5 H6 H7 H8 H9 H10
N11.50102.57723.51842.84412.84412.10922.10921.02791.0279
C21.50101.55842.20692.19512.19511.09911.09912.09112.0911
C32.57721.55841.09991.10051.10052.18932.18932.80132.8013
H43.51842.20691.09991.78621.78622.53632.53633.79883.7988
H52.84412.19511.10051.78621.78563.09872.53712.65283.1643
H62.84412.19511.10051.78621.78562.53713.09873.16432.6528
H72.10921.09912.18932.53633.09872.53711.77252.97052.4228
H82.10921.09912.18932.53632.53713.09871.77252.42282.9705
H91.02792.09112.80133.79882.65283.16432.97052.42281.6666
H101.02792.09112.80133.79883.16432.65282.42282.97051.6666

picture of Ethylamine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C2 C3 114.777 N1 C2 H7 107.419
N1 C2 H8 107.419 C2 N1 H9 110.152
C2 N1 H10 110.152 C2 C3 H4 111.067
C2 C3 H5 110.100 C2 C3 H6 110.100
C3 C2 H7 109.734 C3 C2 H8 109.734
H4 C3 H5 108.533 H4 C3 H6 108.533
H5 C3 H6 108.441 H7 C2 H8 107.483
H9 N1 H10 108.328
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (C1 gauche)

Jump to S1C1
Energy calculated at QCISD/3-21G
 hartrees
Energy at 0K-133.832202
Energy at 298.15K 
Nuclear repulsion energy 
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at QCISD/3-21G
Rotational Constants (cm-1) from geometry optimized at QCISD/3-21G
ABC
1.02822 0.28278 0.25224

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/3-21G

Point Group is Cs

Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability