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: B1B95/6-311G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A'
Energy calculated at B1B95/6-311G**
 hartrees
Energy at 0K-209.185922
Energy at 298.15K-209.191611
Nuclear repulsion energy122.056733
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 B1B95/6-311G**
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 3766 3616 36.27      
2 A 3625 3480 34.04      
3 A 3161 3035 10.24      
4 A 3143 3018 14.57      
5 A 3065 2943 7.49      
6 A 1820 1747 353.74      
7 A 1623 1558 119.47      
8 A 1487 1428 12.91      
9 A 1465 1407 8.99      
10 A 1397 1341 104.79      
11 A 1349 1295 71.85      
12 A 1122 1077 0.45      
13 A 1048 1006 5.96      
14 A 981 941 7.38      
15 A 853 819 2.11      
16 A 677 650 12.53      
17 A 544 522 14.67      
18 A 521 500 7.71      
19 A 423 406 4.08      
20 A 202 194 201.34      
21 A 27 26 8.11      

Unscaled Zero Point Vibrational Energy (zpe) 16148.9 cm-1
Scaled (by 0.9601) Zero Point Vibrational Energy (zpe) 15504.5 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 B1B95/6-311G**
ABC
0.36375 0.31186 0.17329

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/6-311G**

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.354 -0.341 -0.000
C2 0.077 0.148 -0.005
N3 1.025 -0.828 -0.008
O4 0.358 1.326 0.001
H5 -1.912 0.221 -0.748
H6 -1.459 -1.408 -0.197
H7 -1.793 -0.117 0.973
H8 1.991 -0.550 0.030
H9 0.798 -1.804 0.020

Atom - Atom Distances (Å)
  C1 C2 N3 O4 H5 H6 H7 H8 H9
C11.51222.42892.38991.08861.09001.09083.35182.6024
C21.51221.36081.21172.12382.19422.12682.03762.0808
N32.42891.36082.25553.20542.55773.06741.00531.0024
O42.38991.21172.25552.63323.28872.76662.48793.1611
H51.08862.12383.20542.63321.77821.75744.05343.4688
H61.09002.19422.55773.28871.77821.77403.56162.3012
H71.09082.12683.06742.76661.75741.77403.92333.2349
H83.35182.03761.00532.48794.05343.56163.92331.7305
H92.60242.08081.00243.16113.46882.30123.23491.7305

picture of Acetamide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 115.332 C1 C2 O4 122.267
C2 C1 H5 108.389 C2 C1 H6 113.971
C2 C1 H7 108.499 C2 N3 H8 118.117
C2 N3 H9 122.676 N3 C2 O4 122.399
H5 C1 H6 109.419 H5 C1 H7 107.492
H6 C1 H7 108.873 H8 N3 H9 119.059
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/6-311G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.365      
2 C 0.312      
3 N -0.475      
4 O -0.366      
5 H 0.156      
6 H 0.112      
7 H 0.155      
8 H 0.240      
9 H 0.232      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.049 -3.756 0.129 3.759
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.288 -2.323 0.128
y -2.323 -25.644 -0.156
z 0.128 -0.156 -24.674
Traceless
 xyz
x 4.871 -2.323 0.128
y -2.323 -3.163 -0.156
z 0.128 -0.156 -1.709
Polar
3z2-r2-3.417
x2-y25.356
xy-2.323
xz0.128
yz-0.156


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.414 -0.189 0.002
y -0.189 5.533 -0.002
z 0.002 -0.002 3.330


<r2> (average value of r2) Å2
<r2> 74.571
(<r2>)1/2 8.635