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: BLYP/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 BLYP/3-21G*
 hartrees
Energy at 0K-207.985617
Energy at 298.15K-207.991544
Nuclear repulsion energy119.438838
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 BLYP/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 3537 3514 10.90      
2 A 3404 3382 8.09      
3 A 3097 3077 8.05      
4 A 3031 3011 17.34      
5 A 2979 2960 8.26      
6 A 1690 1679 193.09      
7 A 1621 1610 44.89      
8 A 1521 1511 8.65      
9 A 1497 1487 16.15      
10 A 1386 1377 19.43      
11 A 1285 1277 155.07      
12 A 1103 1095 0.12      
13 A 1052 1046 8.82      
14 A 964 958 10.01      
15 A 775 770 4.42      
16 A 656 652 38.48      
17 A 523 519 32.80      
18 A 519 516 10.66      
19 A 427 424 222.32      
20 A 401 399 3.08      
21 A 65 65 0.12      

Unscaled Zero Point Vibrational Energy (zpe) 15766.4 cm-1
Scaled (by 0.9935) Zero Point Vibrational Energy (zpe) 15663.9 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 BLYP/3-21G*
ABC
0.34276 0.30274 0.16586

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

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.406 -0.228 -0.000
C2 0.093 0.157 -0.001
N3 0.935 -0.944 0.000
O4 0.514 1.334 -0.000
H5 -1.996 0.697 -0.023
H6 -1.652 -0.844 -0.882
H7 -1.659 -0.801 0.908
H8 1.945 -0.785 0.002
H9 0.588 -1.904 -0.002

Atom - Atom Distances (Å)
  C1 C2 N3 O4 H5 H6 H7 H8 H9
C11.54732.44822.47481.09691.10331.10353.39722.6049
C21.54731.38651.24992.15742.19612.19412.07842.1200
N32.44821.38652.31663.35912.73542.75221.02261.0210
O42.47481.24992.31662.58973.19563.17922.55703.2390
H51.09692.15743.35912.58971.79661.79584.21063.6662
H61.10332.19612.73543.19561.79661.79003.70482.6298
H71.10352.19412.75223.17921.79581.79003.71682.6635
H83.39722.07841.02262.55704.21063.70483.71681.7594
H92.60492.12001.02103.23903.66622.62982.66351.7594

picture of Acetamide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 113.007 C1 C2 O4 124.100
C2 C1 H5 108.140 C2 C1 H6 110.784
C2 C1 H7 110.613 C2 N3 H8 118.459
C2 N3 H9 122.701 N3 C2 O4 122.893
H5 C1 H6 109.480 H5 C1 H7 109.394
H6 C1 H7 108.414 H8 N3 H9 118.840
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.601      
2 C 0.557      
3 N -0.683      
4 O -0.459      
5 H 0.213      
6 H 0.192      
7 H 0.194      
8 H 0.296      
9 H 0.290      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.194 -3.613 0.003 3.618
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.901 -2.612 -0.007
y -2.612 -24.572 0.003
z -0.007 0.003 -24.625
Traceless
 xyz
x 3.698 -2.612 -0.007
y -2.612 -1.809 0.003
z -0.007 0.003 -1.888
Polar
3z2-r2-3.777
x2-y23.671
xy-2.612
xz-0.007
yz0.003


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> 76.953
(<r2>)1/2 8.772