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: mPW1PW91/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A'
Energy calculated at mPW1PW91/3-21G
 hartrees
Energy at 0K-208.005758
Energy at 298.15K-208.011921
Nuclear repulsion energy121.027929
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 mPW1PW91/3-21G
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 3714 3545 31.50      
2 A 3581 3418 29.54      
3 A 3209 3063 3.65      
4 A 3149 3006 9.08      
5 A 3083 2943 4.21      
6 A 1795 1713 233.03      
7 A 1683 1606 78.72      
8 A 1557 1486 12.44      
9 A 1531 1462 16.27      
10 A 1432 1367 44.31      
11 A 1368 1306 170.25      
12 A 1153 1101 0.30      
13 A 1096 1047 17.54      
14 A 1011 966 5.38      
15 A 836 798 2.11      
16 A 690 659 85.24      
17 A 555 530 102.29      
18 A 547 522 11.78      
19 A 500 478 160.73      
20 A 419 400 3.59      
21 A 85 81 0.15      

Unscaled Zero Point Vibrational Energy (zpe) 16496.0 cm-1
Scaled (by 0.9546) Zero Point Vibrational Energy (zpe) 15747.1 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 mPW1PW91/3-21G
ABC
0.35164 0.31183 0.17060

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/3-21G

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.382 -0.237 0.000
C2 0.089 0.154 -0.000
N3 0.932 -0.923 0.000
O4 0.491 1.321 0.000
H5 -1.979 0.675 -0.000
H6 -1.623 -0.829 -0.889
H7 -1.623 -0.829 0.889
H8 1.930 -0.756 0.000
H9 0.596 -1.874 -0.000

Atom - Atom Distances (Å)
  C1 C2 N3 O4 H5 H6 H7 H8 H9
C11.52242.41372.43641.08921.09511.09513.35222.5676
C21.52241.36701.23452.13282.16502.16502.05282.0901
N32.41371.36702.28643.32032.70632.70651.01151.0092
O42.43641.23452.28642.55353.14373.14362.52613.1968
H51.08922.13283.32032.55351.78291.78294.16203.6226
H61.09512.16502.70633.14371.78291.77773.66242.6078
H71.09512.16502.70653.14361.78291.77773.66252.6081
H83.35222.05281.01152.52614.16203.66243.66251.7408
H92.56762.09011.00923.19683.62262.60782.60811.7408

picture of Acetamide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 113.196 C1 C2 O4 123.866
C2 C1 H5 108.367 C2 C1 H6 110.551
C2 C1 H7 110.550 C2 N3 H8 118.558
C2 N3 H9 122.470 N3 C2 O4 122.938
H5 C1 H6 109.420 H5 C1 H7 109.420
H6 C1 H7 108.518 H8 N3 H9 118.971
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.719      
2 C 0.631      
3 N -0.798      
4 O -0.511      
5 H 0.258      
6 H 0.235      
7 H 0.235      
8 H 0.338      
9 H 0.331      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.326 -3.841 0.000 3.855
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.552 -2.625 0.000
y -2.625 -24.774 0.000
z 0.000 0.000 -24.563
Traceless
 xyz
x 4.117 -2.625 0.000
y -2.625 -2.217 0.000
z 0.000 0.000 -1.900
Polar
3z2-r2-3.799
x2-y24.222
xy-2.625
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 0.000 0.000 0.000
y 0.000 0.000 0.000
z 0.000 0.000 0.000


<r2> (average value of r2) Å2
<r2> 75.221
(<r2>)1/2 8.673