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All results from a given calculation for CH3CONH2 (Acetamide)

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 C1 1A'
Energy calculated at QCISD/3-21G
 hartrees
Energy at 0K-207.248922
Energy at 298.15K-207.254974
HF Energy-206.812318
Nuclear repulsion energy119.921281
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 3672 3559 23.02      
2 A 3542 3433 29.29      
3 A 3147 3050 6.86      
4 A 3098 3002 13.90      
5 A 3039 2945 6.24      
6 A 1738 1685 222.07      
7 A 1698 1645 39.47      
8 A 1566 1518 8.36      
9 A 1553 1505 14.42      
10 A 1445 1401 21.37      
11 A 1341 1300 182.54      
12 A 1144 1109 0.50      
13 A 1100 1067 8.97      
14 A 1006 975 15.67      
15 A 804 779 1.80      
16 A 653 632 51.62      
17 A 543 526 12.27      
18 A 534 518 39.55      
19 A 416 403 2.88      
20 A 385 373 270.87      
21 A 108 105 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 16265.9 cm-1
Scaled (by 0.9692) Zero Point Vibrational Energy (zpe) 15764.9 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
0.34495 0.30543 0.16717

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

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.396 -0.255 0.000
C2 -0.089 0.155 -0.000
N3 -0.955 -0.921 -0.000
O4 -0.478 1.339 -0.000
H5 1.998 0.659 -0.000
H6 1.629 -0.850 0.894
H7 1.629 -0.851 -0.894
H8 -1.953 -0.742 0.000
H9 -0.631 -1.880 -0.000

Atom - Atom Distances (Å)
  C1 C2 N3 O4 H5 H6 H7 H8 H9
C11.54072.44392.46041.09441.09931.09933.38412.5976
C21.54071.38171.24622.14722.18252.18252.06842.1054
N32.44391.38172.31023.34962.73582.73541.01371.0115
O42.46041.24622.31022.56803.16773.16792.55043.2221
H51.09442.14723.34962.56801.79291.79294.19203.6544
H61.09932.18252.73583.16771.79291.78813.69362.6395
H71.09932.18252.73543.16791.79291.78813.69352.6389
H83.38412.06841.01372.55044.19203.69363.69351.7442
H92.59762.10541.01153.22213.65442.63952.63891.7442

picture of Acetamide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 113.388 C1 C2 O4 123.627
C2 C1 H5 107.945 C2 C1 H6 110.401
C2 C1 H7 110.402 C2 N3 H8 118.617
C2 N3 H9 122.471 N3 C2 O4 122.985
H5 C1 H6 109.626 H5 C1 H7 109.624
H6 C1 H7 108.831 H8 N3 H9 118.912
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability