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All results from a given calculation for CH3CONH2 (Acetamide)

using model chemistry: B3PW91/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A'
Energy calculated at B3PW91/3-21G
 hartrees
Energy at 0K-207.984493
Energy at 298.15K-207.990627
Nuclear repulsion energy120.770062
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 B3PW91/3-21G
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 3690 3547 28.43      
2 A 3557 3419 25.69      
3 A 3190 3066 4.13      
4 A 3130 3008 10.33      
5 A 3065 2946 4.80      
6 A 1777 1708 227.58      
7 A 1673 1608 73.44      
8 A 1549 1489 12.04      
9 A 1524 1465 16.34      
10 A 1423 1368 39.83      
11 A 1355 1302 170.16      
12 A 1144 1100 0.22      
13 A 1089 1046 16.49      
14 A 1004 965 5.65      
15 A 826 794 2.45      
16 A 685 659 78.57      
17 A 550 529 95.58      
18 A 543 522 11.18      
19 A 495 476 168.31      
20 A 416 400 3.59      
21 A 81 78 0.15      

Unscaled Zero Point Vibrational Energy (zpe) 16382.9 cm-1
Scaled (by 0.9612) Zero Point Vibrational Energy (zpe) 15747.2 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 B3PW91/3-21G
ABC
0.35017 0.31037 0.16983

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/3-21G

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.386 -0.234 0.000
C2 0.090 0.154 -0.000
N3 0.932 -0.927 0.000
O4 0.496 1.323 -0.000
H5 -1.982 0.679 -0.000
H6 -1.628 -0.828 -0.890
H7 -1.628 -0.827 0.890
H8 1.932 -0.762 0.000
H9 0.593 -1.879 -0.000

Atom - Atom Distances (Å)
  C1 C2 N3 O4 H5 H6 H7 H8 H9
C11.52632.41882.44251.09071.09671.09673.35912.5727
C21.52631.37001.23702.13742.17022.17022.05692.0944
N32.41881.37002.29133.32682.71242.71251.01311.0109
O42.44251.23702.29132.56003.15113.15102.53153.2033
H51.09072.13743.32682.56001.78521.78524.17033.6292
H61.09672.17022.71243.15111.78521.78023.67012.6135
H71.09672.17022.71253.15101.78521.78023.67022.6138
H83.35912.05691.01312.53154.17033.67013.67021.7435
H92.57272.09441.01093.20333.62922.61352.61381.7435

picture of Acetamide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 113.155 C1 C2 O4 123.903
C2 C1 H5 108.367 C2 C1 H6 110.588
C2 C1 H7 110.588 C2 N3 H8 118.571
C2 N3 H9 122.487 N3 C2 O4 122.942
H5 C1 H6 109.390 H5 C1 H7 109.392
H6 C1 H7 108.499 H8 N3 H9 118.942
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.710      
2 C 0.619      
3 N -0.785      
4 O -0.503      
5 H 0.254      
6 H 0.231      
7 H 0.231      
8 H 0.335      
9 H 0.328      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.302 -3.824 0.000 3.835
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.557 -2.643 0.000
y -2.643 -24.706 0.000
z 0.000 0.000 -24.561
Traceless
 xyz
x 4.076 -2.643 0.000
y -2.643 -2.147 0.000
z 0.000 0.000 -1.929
Polar
3z2-r2-3.858
x2-y24.149
xy-2.643
xz0.000
yz0.000


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> 75.477
(<r2>)1/2 8.688