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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: B2PLYP/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B2PLYP/6-31G*
 hartrees
Energy at 0K-153.663400
Energy at 298.15K-153.667314
HF Energy-153.519341
Nuclear repulsion energy69.468106
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 B2PLYP/6-31G*
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' 3201 3038 8.90 49.88 0.72 0.83
2 A' 3078 2922 2.51 117.68 0.02 0.03
3 A' 2950 2800 131.76 123.99 0.34 0.51
4 A' 1820 1728 133.82 5.61 0.55 0.71
5 A' 1511 1434 17.47 22.50 0.70 0.82
6 A' 1458 1384 12.45 9.84 0.60 0.75
7 A' 1424 1352 16.41 5.21 0.74 0.85
8 A' 1153 1094 23.41 3.60 0.47 0.64
9 A' 908 862 7.14 6.15 0.38 0.56
10 A' 510 484 13.23 1.25 0.48 0.65
11 A" 3143 2983 8.56 68.27 0.75 0.86
12 A" 1521 1443 9.52 15.13 0.75 0.86
13 A" 1158 1099 1.12 0.77 0.75 0.86
14 A" 790 750 0.64 7.89 0.75 0.86
15 A" 152 145 0.41 1.10 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12388.4 cm-1
Scaled (by 0.9492) Zero Point Vibrational Energy (zpe) 11759.1 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 B2PLYP/6-31G*
ABC
1.89403 0.33643 0.30165

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.464 0.000
C2 -0.941 -0.712 0.000
O3 1.212 0.376 0.000
H4 -0.492 1.459 0.000
H5 -0.377 -1.645 0.000
H6 -1.591 -0.666 0.880
H7 -1.591 -0.666 -0.880

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.50571.21531.11022.14252.14122.1412
C21.50572.41202.21661.09031.09551.0955
O31.21532.41202.01942.57123.11783.1178
H41.11022.21662.01943.10632.54962.5496
H52.14251.09032.57123.10631.79061.7906
H62.14121.09553.11782.54961.79061.7603
H72.14121.09553.11782.54961.79061.7603

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.216 C1 C2 H6 109.802
C1 C2 H7 109.802 C2 C1 O3 124.519
C2 C1 H4 115.015 O3 C1 H4 120.467
H5 C2 H6 110.019 H5 C2 H7 110.019
H6 C2 H7 106.925
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B2PLYP/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.255      
2 C -0.540      
3 O -0.374      
4 H 0.112      
5 H 0.189      
6 H 0.179      
7 H 0.179      


Electric dipole moments


Electric Quadrupole moment
Quadrupole components in D Å


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.339 0.084 -0.001
y 0.084 3.562 -0.000
z -0.001 -0.000 2.543


<r2> (average value of r2) Å2
<r2> 46.959
(<r2>)1/2 6.853