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 CH3CONH2 (Acetamide)

using model chemistry: MP2/CEP-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A'
Energy calculated at MP2/CEP-31G*
 hartrees
Energy at 0K-39.847027
Energy at 298.15K-39.852838
HF Energy-39.277608
Nuclear repulsion energy67.398014
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 MP2/CEP-31G*
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 3753 3563 37.66      
2 A 3609 3426 43.33      
3 A 3219 3056 13.50      
4 A 3205 3043 17.83      
5 A 3106 2949 10.14      
6 A 1791 1700 332.79      
7 A 1651 1568 91.20      
8 A 1519 1443 9.78      
9 A 1500 1424 8.35      
10 A 1440 1367 76.99      
11 A 1361 1293 114.75      
12 A 1139 1081 0.24      
13 A 1074 1020 5.45      
14 A 999 948 9.50      
15 A 865 821 2.15      
16 A 652 619 26.00      
17 A 542 515 25.89      
18 A 514 488 23.15      
19 A 425 404 6.22      
20 A 319 303 272.55      
21 A 28 26 3.78      

Unscaled Zero Point Vibrational Energy (zpe) 16355.3 cm-1
Scaled (by 0.9494) Zero Point Vibrational Energy (zpe) 15527.7 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 MP2/CEP-31G*
ABC
0.34915 0.30120 0.16712

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G*

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.384 -0.332 -0.000
C2 0.075 0.147 -0.002
N3 1.033 -0.862 -0.053
O4 0.386 1.350 0.008
H5 -1.938 0.257 -0.749
H6 -1.484 -1.407 -0.225
H7 -1.820 -0.121 0.991
H8 1.995 -0.572 0.114
H9 0.784 -1.817 0.190

Atom - Atom Distances (Å)
  C1 C2 N3 O4 H5 H6 H7 H8 H9
C11.53552.47452.44101.10171.10281.10363.38952.6349
C21.53551.39151.24252.15052.21242.15632.05332.0968
N32.47451.39152.30523.24992.58073.12671.01921.0167
O42.44101.24252.30522.67773.33902.82732.50893.1973
H51.10172.15053.24992.67771.80211.78444.11153.5488
H61.10282.21242.58073.33901.80211.80153.59412.3420
H71.10362.15633.12672.82731.78441.80153.94033.2095
H83.38952.05331.01922.50894.11153.59413.94031.7388
H92.63492.09681.01673.19733.54882.34203.20951.7388

picture of Acetamide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 115.338 C1 C2 O4 122.619
C2 C1 H5 108.137 C2 C1 H6 112.946
C2 C1 H7 108.474 C2 N3 H8 115.945
C2 N3 H9 120.275 N3 C2 O4 122.021
H5 C1 H6 109.657 H5 C1 H7 108.030
H6 C1 H7 109.468 H8 N3 H9 117.314
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability