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All results from a given calculation for CH3CONH2 (Acetamide)

using model chemistry: B1B95/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A'
Energy calculated at B1B95/3-21G*
 hartrees
Energy at 0K-207.967746
Energy at 298.15K-207.973836
Nuclear repulsion energy121.039340
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 B1B95/3-21G*
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 3697 3530 28.35      
2 A 3563 3402 27.62      
3 A 3202 3057 4.15      
4 A 3143 3001 9.79      
5 A 3077 2938 4.34      
6 A 1787 1706 229.08      
7 A 1672 1597 78.31      
8 A 1548 1478 12.04      
9 A 1524 1455 15.53      
10 A 1421 1357 41.61      
11 A 1358 1297 169.71      
12 A 1143 1092 0.34      
13 A 1087 1038 16.21      
14 A 1002 956 5.51      
15 A 829 792 2.20      
16 A 685 654 84.45      
17 A 550 525 100.50      
18 A 540 515 11.53      
19 A 496 474 156.37      
20 A 410 391 3.40      
21 A 67 64 0.13      

Unscaled Zero Point Vibrational Energy (zpe) 16400.0 cm-1
Scaled (by 0.9549) Zero Point Vibrational Energy (zpe) 15660.3 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 B1B95/3-21G*
ABC
0.35156 0.31197 0.17061

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/3-21G*

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.382 -0.234 -0.000
C2 0.090 0.154 0.000
N3 0.929 -0.925 -0.000
O4 0.495 1.320 0.000
H5 -1.977 0.678 -0.001
H6 -1.623 -0.826 -0.888
H7 -1.624 -0.824 0.889
H8 1.927 -0.762 -0.000
H9 0.588 -1.875 0.001

Atom - Atom Distances (Å)
  C1 C2 N3 O4 H5 H6 H7 H8 H9
C11.52252.41272.43701.08841.09421.09433.35172.5651
C21.52251.36741.23412.13202.16432.16432.05352.0901
N32.41271.36742.28683.31882.70392.70481.01151.0093
O42.43701.23412.28682.55403.14363.14302.52733.1967
H51.08842.13203.31882.55401.78181.78184.16143.6195
H61.09422.16432.70393.14361.78181.77663.66022.6040
H71.09432.16432.70483.14301.78181.77663.66112.6050
H83.35172.05351.01152.52734.16143.66023.66111.7410
H92.56512.09011.00933.19673.61952.60402.60501.7410

picture of Acetamide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 113.094 C1 C2 O4 123.938
C2 C1 H5 108.340 C2 C1 H6 110.536
C2 C1 H7 110.532 C2 N3 H8 118.593
C2 N3 H9 122.425 N3 C2 O4 122.968
H5 C1 H6 109.441 H5 C1 H7 109.438
H6 C1 H7 108.539 H8 N3 H9 118.981
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.692      
2 C 0.612      
3 N -0.779      
4 O -0.500      
5 H 0.250      
6 H 0.227      
7 H 0.227      
8 H 0.332      
9 H 0.324      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.311 -3.800 0.001 3.812
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.575 -2.621 -0.001
y -2.621 -24.697 -0.002
z -0.001 -0.002 -24.527
Traceless
 xyz
x 4.037 -2.621 -0.001
y -2.621 -2.145 -0.002
z -0.001 -0.002 -1.892
Polar
3z2-r2-3.783
x2-y24.121
xy-2.621
xz-0.001
yz-0.002


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.409 -0.024 -0.000
y -0.024 4.947 -0.000
z -0.000 -0.000 2.415


<r2> (average value of r2) Å2
<r2> 75.190
(<r2>)1/2 8.671