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All results from a given calculation for CH3CHO (Acetaldehyde)

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 CS 1A'
Energy calculated at B3LYP/3-21G*
 hartrees
Energy at 0K-152.978549
Energy at 298.15K-152.982484
HF Energy-152.978549
Nuclear repulsion energy68.960660
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
4/u)
Dep P Dep U
1 A' 3158 3038 9.38 47.65 0.70 0.82
2 A' 3045 2929 1.29 108.85 0.02 0.03
3 A' 2893 2783 131.86 113.74 0.35 0.52
4 A' 1755 1688 91.92 3.05 0.46 0.63
5 A' 1520 1463 22.88 26.24 0.72 0.84
6 A' 1457 1401 3.34 11.73 0.69 0.82
7 A' 1430 1375 36.67 8.02 0.74 0.85
8 A' 1135 1091 28.46 3.45 0.53 0.69
9 A' 880 846 13.25 5.51 0.32 0.48
10 A' 493 475 10.61 1.35 0.54 0.70
11 A" 3095 2977 6.33 66.60 0.75 0.86
12 A" 1540 1482 13.89 18.94 0.75 0.86
13 A" 1164 1119 1.47 0.92 0.75 0.86
14 A" 818 787 3.18 7.50 0.75 0.86
15 A" 168 162 0.03 1.15 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12275.3 cm-1
Scaled (by 0.962) Zero Point Vibrational Energy (zpe) 11808.8 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
1.89646 0.32949 0.29625

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.462 0.000
C2 -0.951 -0.717 0.000
O3 1.227 0.384 0.000
H4 -0.521 1.441 0.000
H5 -0.388 -1.652 0.000
H6 -1.600 -0.669 0.884
H7 -1.600 -0.669 -0.884

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.51431.22911.10882.14992.14952.1495
C21.51432.43992.19991.09191.09781.0978
O31.22912.43992.04212.59943.14343.1434
H41.10882.19992.04213.09622.52902.5290
H52.14991.09192.59943.09621.79381.7938
H62.14951.09783.14342.52901.79381.7675
H72.14951.09783.14342.52901.79381.7675

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.108 C1 C2 H6 109.721
C1 C2 H7 109.721 C2 C1 O3 125.266
C2 C1 H4 113.089 O3 C1 H4 121.645
H5 C2 H6 110.012 H5 C2 H7 110.012
H6 C2 H7 107.220
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.249      
2 C -0.659      
3 O -0.406      
4 H 0.152      
5 H 0.225      
6 H 0.220      
7 H 0.220      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -2.522 -0.290 0.000 2.539
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.631 -0.762 0.000
y -0.762 -17.936 0.000
z 0.000 0.000 -17.751
Traceless
 xyz
x -2.787 -0.762 0.000
y -0.762 1.255 0.000
z 0.000 0.000 1.532
Polar
3z2-r23.064
x2-y2-2.695
xy-0.762
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.072 0.099 0.000
y 0.099 3.305 0.000
z 0.000 0.000 2.263


<r2> (average value of r2) Å2
<r2> 47.536
(<r2>)1/2 6.895