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: PBEPBEultrafine/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A'
Energy calculated at PBEPBEultrafine/6-31G*
 hartrees
Energy at 0K-208.961924
Energy at 298.15K-208.967480
HF Energy-208.961924
Nuclear repulsion energy120.574157
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 PBEPBEultrafine/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A 3635 3575 21.28      
2 A 3504 3446 18.27      
3 A 3089 3038 8.57      
4 A 3080 3029 15.43      
5 A 3000 2951 8.48      
6 A 1765 1736 271.75      
7 A 1593 1567 91.60      
8 A 1472 1448 8.19      
9 A 1454 1430 6.60      
10 A 1373 1350 56.38      
11 A 1321 1300 103.50      
12 A 1097 1079 0.14      
13 A 1028 1011 7.31      
14 A 956 940 4.62      
15 A 827 814 3.10      
16 A 660 649 14.33      
17 A 524 515 13.58      
18 A 504 496 9.09      
19 A 416 409 4.42      
20 A 164 161 222.69      
21 A 39 39 8.44      

Unscaled Zero Point Vibrational Energy (zpe) 15750.1 cm-1
Scaled (by 0.9835) Zero Point Vibrational Energy (zpe) 15490.3 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 PBEPBEultrafine/6-31G*
ABC
0.35419 0.30518 0.16922

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBEultrafine/6-31G*

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.373 -0.326 0.000
C2 0.080 0.150 -0.011
N3 1.020 -0.855 -0.007
O4 0.386 1.342 0.002
H5 -1.956 0.318 -0.674
H6 -1.503 -1.380 -0.300
H7 -1.784 -0.200 1.016
H8 2.002 -0.593 0.039
H9 0.776 -1.841 0.014

Atom - Atom Distances (Å)
  C1 C2 N3 O4 H5 H6 H7 H8 H9
C11.52942.45062.42451.09981.10271.10333.38562.6287
C21.52941.37621.23022.14792.22042.15732.06112.1092
N32.45061.37622.28633.26782.59363.05561.01731.0157
O42.42451.23022.28632.64453.32672.84902.52073.2062
H51.09982.14793.26782.64451.79621.77634.12363.5490
H61.10272.22042.59363.32671.79621.78943.60812.3461
H71.10332.15733.05562.84901.77631.78943.92953.2011
H83.38562.06111.01732.52074.12363.60813.92951.7496
H92.62872.10921.01573.20623.54902.34613.20111.7496

picture of Acetamide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 114.902 C1 C2 O4 122.576
C2 C1 H5 108.454 C2 C1 H6 114.065
C2 C1 H7 108.978 C2 N3 H8 118.107
C2 N3 H9 123.009 N3 C2 O4 122.505
H5 C1 H6 109.273 H5 C1 H7 107.458
H6 C1 H7 108.415 H8 N3 H9 118.762
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBEultrafine/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.576      
2 C 0.536      
3 N -0.715      
4 O -0.462      
5 H 0.201      
6 H 0.152      
7 H 0.197      
8 H 0.337      
9 H 0.329      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.028 -3.583 0.334 3.599
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.103 -2.392 0.436
y -2.392 -25.201 -0.512
z 0.436 -0.512 -24.560
Traceless
 xyz
x 4.777 -2.392 0.436
y -2.392 -2.870 -0.512
z 0.436 -0.512 -1.908
Polar
3z2-r2-3.816
x2-y25.098
xy-2.392
xz0.436
yz-0.512


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.326 -0.238 0.005
y -0.238 5.542 -0.008
z 0.005 -0.008 2.971


<r2> (average value of r2) Å2
<r2> 75.855
(<r2>)1/2 8.709