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: B3PW91/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A'
Energy calculated at B3PW91/6-31G*
 hartrees
Energy at 0K-209.133981
Energy at 298.15K-209.139544
Nuclear repulsion energy121.483702
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 B3PW91/6-31G*
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 3752 3589 33.82      
2 A 3619 3462 32.92      
3 A 3169 3032 8.97      
4 A 3153 3017 15.25      
5 A 3075 2942 7.36      
6 A 1829 1750 322.27      
7 A 1648 1577 109.36      
8 A 1516 1450 10.57      
9 A 1497 1433 7.04      
10 A 1423 1361 72.09      
11 A 1368 1309 103.90      
12 A 1133 1084 0.54      
13 A 1065 1019 9.08      
14 A 993 950 5.89      
15 A 855 818 1.91      
16 A 678 649 15.94      
17 A 543 520 13.90      
18 A 522 499 7.92      
19 A 429 410 4.60      
20 A 128 122 239.37      
21 A 29 28 14.45      

Unscaled Zero Point Vibrational Energy (zpe) 16212.3 cm-1
Scaled (by 0.9567) Zero Point Vibrational Energy (zpe) 15510.3 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 B3PW91/6-31G*
ABC
0.36042 0.30891 0.17166

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-31G*

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.362 -0.336 -0.000
C2 0.078 0.147 -0.005
N3 1.025 -0.836 -0.012
O4 0.368 1.332 0.002
H5 -1.914 0.206 -0.772
H6 -1.472 -1.412 -0.169
H7 -1.815 -0.083 0.964
H8 1.995 -0.562 0.037
H9 0.797 -1.816 0.037

Atom - Atom Distances (Å)
  C1 C2 N3 O4 H5 H6 H7 H8 H9
C11.51852.43872.40291.09311.09451.09503.36492.6180
C21.51851.36511.21982.13512.20422.13902.04482.0909
N32.43871.36512.26523.20962.56743.09621.00941.0069
O42.40291.21982.26522.65953.30792.77352.49723.1768
H51.09312.13513.20962.65951.78251.76274.06533.4778
H61.09452.20422.56743.30791.78251.77973.57592.3145
H71.09502.13903.09622.77351.76271.77973.95093.2694
H83.36492.04481.00942.49724.06533.57593.95091.7338
H92.61802.09091.00693.17683.47782.31453.26941.7338

picture of Acetamide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 115.393 C1 C2 O4 122.307
C2 C1 H5 108.582 C2 C1 H6 114.056
C2 C1 H7 108.775 C2 N3 H8 118.123
C2 N3 H9 122.931 N3 C2 O4 122.300
H5 C1 H6 109.144 H5 C1 H7 107.328
H6 C1 H7 108.747 H8 N3 H9 118.608
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.605     -0.602
2 C 0.591     0.821
3 N -0.782     -0.996
4 O -0.501     -0.559
5 H 0.212     0.171
6 H 0.164     0.152
7 H 0.209     0.167
8 H 0.360     0.423
9 H 0.352     0.421


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.058 -3.752 0.188 3.757
CHELPG        
AIM        
ESP -0.079 -3.776 0.200 3.782


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.878 -2.390 0.209
y -2.390 -25.260 -0.257
z 0.209 -0.257 -24.465
Traceless
 xyz
x 4.985 -2.390 0.209
y -2.390 -3.089 -0.257
z 0.209 -0.257 -1.896
Polar
3z2-r2-3.791
x2-y25.383
xy-2.390
xz0.209
yz-0.257


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> 74.936
(<r2>)1/2 8.657