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: B3LYP/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 B3LYP/3-21G
 hartrees
Energy at 0K-208.059441
Energy at 298.15K-208.065543
Nuclear repulsion energy120.592970
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 B3LYP/3-21G
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 3659 3530 22.12      
2 A 3529 3405 20.66      
3 A 3178 3066 5.57      
4 A 3114 3005 12.95      
5 A 3059 2952 5.94      
6 A 1764 1702 222.17      
7 A 1673 1614 65.21      
8 A 1556 1501 10.23      
9 A 1532 1478 15.54      
10 A 1429 1379 29.14      
11 A 1342 1295 172.04      
12 A 1143 1103 0.23      
13 A 1091 1053 13.28      
14 A 1002 967 8.69      
15 A 815 786 2.81      
16 A 679 655 66.10      
17 A 543 524 63.07      
18 A 541 522 11.58      
19 A 476 459 198.98      
20 A 416 401 3.35      
21 A 80 77 0.11      

Unscaled Zero Point Vibrational Energy (zpe) 16309.6 cm-1
Scaled (by 0.9649) Zero Point Vibrational Energy (zpe) 15737.1 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 B3LYP/3-21G
ABC
0.34948 0.30883 0.16920

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/3-21G

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.389 -0.241 -0.000
C2 -0.090 0.155 -0.000
N3 -0.940 -0.923 0.000
O4 -0.490 1.326 0.000
H5 1.988 0.670 -0.000
H6 1.629 -0.835 0.889
H7 1.629 -0.835 -0.889
H8 -1.939 -0.753 -0.000
H9 -0.607 -1.879 0.000

Atom - Atom Distances (Å)
  C1 C2 N3 O4 H5 H6 H7 H8 H9
C11.53072.42672.44631.08981.09601.09603.36722.5822
C21.53071.37331.23732.14012.17352.17352.06012.0988
N32.42671.37332.29393.33292.71952.71941.01391.0117
O42.44631.23732.29392.56283.15413.15422.53393.2070
H51.08982.14013.33292.56281.78441.78444.17643.6371
H61.09602.17352.71953.15411.78441.77823.67792.6228
H71.09602.17352.71943.15421.78441.77823.67782.6228
H83.36722.06011.01392.53394.17643.67793.67781.7443
H92.58222.09881.01173.20703.63712.62282.62281.7443

picture of Acetamide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 113.252 C1 C2 O4 123.858
C2 C1 H5 108.328 C2 C1 H6 110.583
C2 C1 H7 110.584 C2 N3 H8 118.540
C2 N3 H9 122.563 N3 C2 O4 122.890
H5 C1 H6 109.446 H5 C1 H7 109.448
H6 C1 H7 108.437 H8 N3 H9 118.897
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.641     -0.619
2 C 0.613     0.809
3 N -0.747     -0.964
4 O -0.496     -0.535
5 H 0.230     0.164
6 H 0.208     0.164
7 H 0.208     0.164
8 H 0.316     0.409
9 H 0.309     0.408


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.269 -3.747 0.000 3.757
CHELPG        
AIM        
ESP 0.272 -3.758 0.000 3.767


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.734 2.584 0.000
y 2.584 -24.839 -0.000
z 0.000 -0.000 -24.565
Traceless
 xyz
x 3.968 2.584 0.000
y 2.584 -2.189 -0.000
z 0.000 -0.000 -1.779
Polar
3z2-r2-3.558
x2-y24.104
xy2.584
xz0.000
yz-0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.466 0.036 -0.000
y 0.036 4.976 0.001
z -0.000 0.001 2.412


<r2> (average value of r2) Å2
<r2> 75.759
(<r2>)1/2 8.704