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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: PBE1PBE/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 PBE1PBE/3-21G
 hartrees
Energy at 0K-152.797530
Energy at 298.15K-152.801475
HF Energy-152.797530
Nuclear repulsion energy69.124291
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 PBE1PBE/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' 3187 3060 6.23 46.82 0.72 0.83
2 A' 3063 2942 0.70 109.16 0.01 0.03
3 A' 2927 2811 122.56 112.80 0.35 0.52
4 A' 1781 1710 95.35 3.62 0.46 0.63
5 A' 1514 1454 25.53 26.54 0.72 0.84
6 A' 1458 1400 2.69 10.38 0.68 0.81
7 A' 1427 1370 46.41 7.40 0.75 0.86
8 A' 1141 1096 31.07 3.07 0.48 0.65
9 A' 897 862 11.43 5.32 0.33 0.50
10 A' 496 476 11.14 1.29 0.53 0.70
11 A" 3126 3002 3.35 65.89 0.75 0.86
12 A" 1535 1474 17.10 18.36 0.75 0.86
13 A" 1166 1120 1.77 1.02 0.75 0.86
14 A" 819 787 4.73 7.18 0.75 0.86
15 A" 167 160 0.03 1.12 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12351.8 cm-1
Scaled (by 0.9604) Zero Point Vibrational Energy (zpe) 11862.6 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 PBE1PBE/3-21G
ABC
1.89958 0.33180 0.29821

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.460 0.000
C2 -0.949 -0.710 0.000
O3 1.224 0.378 0.000
H4 -0.516 1.441 0.000
H5 -0.388 -1.648 0.000
H6 -1.599 -0.661 0.884
H7 -1.599 -0.661 -0.884

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.50721.22711.10822.14342.14362.1436
C21.50722.43092.19491.09231.09821.0982
O31.22712.43092.03902.58913.13553.1355
H41.10822.19492.03903.09152.52482.5248
H52.14341.09232.58913.09151.79471.7947
H62.14361.09823.13552.52481.79471.7680
H72.14361.09823.13552.52481.79471.7680

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.057 C1 C2 H6 109.731
C1 C2 H7 109.731 C2 C1 O3 125.195
C2 C1 H4 113.240 O3 C1 H4 121.565
H5 C2 H6 110.028 H5 C2 H7 110.028
H6 C2 H7 107.219
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.238      
2 C -0.746      
3 O -0.418      
4 H 0.177      
5 H 0.254      
6 H 0.247      
7 H 0.247      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -2.614 -0.280 0.000 2.629
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.633 -0.791 0.000
y -0.791 -17.842 0.000
z 0.000 0.000 -17.771
Traceless
 xyz
x -2.826 -0.791 0.000
y -0.791 1.360 0.000
z 0.000 0.000 1.467
Polar
3z2-r22.933
x2-y2-2.791
xy-0.791
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.066 0.096 0.000
y 0.096 3.281 0.000
z 0.000 0.000 2.265


<r2> (average value of r2) Å2
<r2> 47.309
(<r2>)1/2 6.878