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: B2PLYP/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A'
Energy calculated at B2PLYP/6-31G(2df,p)
 hartrees
Energy at 0K-209.054029
Energy at 298.15K-209.059779
HF Energy-208.815903
Nuclear repulsion energy121.641126
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 B2PLYP/6-31G(2df,p)
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 3769 3599 35.97      
2 A 3630 3467 35.54      
3 A 3200 3056 5.19      
4 A 3149 3008 10.11      
5 A 3078 2940 5.40      
6 A 1808 1727 273.68      
7 A 1631 1558 88.89      
8 A 1503 1436 6.91      
9 A 1491 1424 9.00      
10 A 1413 1349 73.57      
11 A 1348 1288 91.78      
12 A 1133 1082 0.39      
13 A 1063 1015 4.11      
14 A 984 940 8.20      
15 A 849 811 2.17      
16 A 649 620 10.94      
17 A 553 528 16.76      
18 A 518 495 4.84      
19 A 415 396 3.77      
20 A 233 222 204.65      
21 A 47 45 0.24      

Unscaled Zero Point Vibrational Energy (zpe) 16230.7 cm-1
Scaled (by 0.955) Zero Point Vibrational Energy (zpe) 15500.4 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 B2PLYP/6-31G(2df,p)
ABC
0.35935 0.31078 0.17213

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP/6-31G(2df,p)

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.373 -0.286 0.000
C2 0.083 0.157 0.001
N3 0.981 -0.877 -0.031
O4 0.426 1.322 0.004
H5 -2.003 0.597 -0.059
H6 -1.582 -0.942 -0.849
H7 -1.608 -0.839 0.913
H8 1.956 -0.650 0.069
H9 0.700 -1.830 0.103

Atom - Atom Distances (Å)
  C1 C2 N3 O4 H5 H6 H7 H8 H9
C11.52162.42712.41191.08701.09281.09303.34912.5866
C21.52161.37001.21362.13312.16852.16432.04072.0836
N32.42711.37002.26763.32902.69162.75671.00551.0035
O42.41191.21362.26762.53543.14333.10312.49683.1654
H51.08702.13313.32902.53541.78041.77814.15323.6368
H61.09282.16852.69163.14331.78041.76513.66672.6275
H71.09302.16432.75673.10311.77811.76513.66792.6394
H83.34912.04071.00552.49684.15323.66673.66791.7241
H92.58662.08361.00353.16543.63682.62752.63941.7241

picture of Acetamide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 114.046 C1 C2 O4 123.328
C2 C1 H5 108.575 C2 C1 H6 111.021
C2 C1 H7 110.681 C2 N3 H8 117.601
C2 N3 H9 122.009 N3 C2 O4 122.612
H5 C1 H6 109.531 H5 C1 H7 109.306
H6 C1 H7 107.707 H8 N3 H9 118.219
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B2PLYP/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.502      
2 C 0.401      
3 N -0.535      
4 O -0.357      
5 H 0.162      
6 H 0.140      
7 H 0.150      
8 H 0.273      
9 H 0.269      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.242 -3.576 0.438 3.611
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.684 -2.238 0.561
y -2.238 -25.190 -0.668
z 0.561 -0.668 -24.476
Traceless
 xyz
x 4.149 -2.238 0.561
y -2.238 -2.610 -0.668
z 0.561 -0.668 -1.539
Polar
3z2-r2-3.079
x2-y24.506
xy-2.238
xz0.561
yz-0.668


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.213 -0.114 0.007
y -0.114 5.494 -0.010
z 0.007 -0.010 3.314


<r2> (average value of r2) Å2
<r2> 74.846
(<r2>)1/2 8.651