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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: PBEPBE/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at PBEPBE/6-31G(2df,p)
 hartrees
Energy at 0K-153.651884
Energy at 298.15K-153.655748
HF Energy-153.651884
Nuclear repulsion energy69.246911
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 PBEPBE/6-31G(2df,p)
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' 3099 3067 7.61 49.34 0.72 0.84
2 A' 2969 2939 1.18 125.74 0.01 0.02
3 A' 2768 2739 141.18 131.29 0.34 0.50
4 A' 1785 1767 146.03 7.52 0.44 0.61
5 A' 1408 1394 16.09 22.07 0.66 0.79
6 A' 1383 1369 9.55 6.49 0.68 0.81
7 A' 1313 1300 25.27 7.46 0.70 0.82
8 A' 1090 1078 24.31 2.96 0.37 0.54
9 A' 861 853 9.16 5.58 0.39 0.56
10 A' 484 479 10.46 1.03 0.44 0.61
11 A" 3037 3006 4.23 66.94 0.75 0.86
12 A" 1419 1404 7.92 12.14 0.75 0.86
13 A" 1091 1080 1.04 1.71 0.75 0.86
14 A" 739 732 1.12 5.91 0.75 0.86
15 A" 166 164 0.10 1.04 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 11806.6 cm-1
Scaled (by 0.9897) Zero Point Vibrational Energy (zpe) 11685.0 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 PBEPBE/6-31G(2df,p)
ABC
1.88582 0.33413 0.29971

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.461 0.000
C2 -0.935 -0.724 0.000
O3 1.212 0.392 0.000
H4 -0.523 1.459 0.000
H5 -0.370 -1.667 0.000
H6 -1.596 -0.675 0.883
H7 -1.596 -0.675 -0.883

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.50971.21361.12632.16002.14912.1491
C21.50972.41892.22171.09861.10451.1045
O31.21362.41892.03652.59583.13053.1305
H41.12632.22172.03653.12942.54682.5468
H52.16001.09862.59583.12941.80711.8071
H62.14911.10453.13052.54681.80711.7666
H72.14911.10453.13052.54681.80711.7666

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.832 C1 C2 H6 109.620
C1 C2 H7 109.620 C2 C1 O3 124.954
C2 C1 H4 114.094 O3 C1 H4 120.951
H5 C2 H6 110.226 H5 C2 H7 110.226
H6 C2 H7 106.210
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.143      
2 C -0.480      
3 O -0.202      
4 H 0.074      
5 H 0.154      
6 H 0.155      
7 H 0.155      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -2.445 -0.377 0.000 2.474
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.198 -0.689 0.000
y -0.689 -17.792 0.000
z 0.000 0.000 -17.570
Traceless
 xyz
x -2.517 -0.689 0.000
y -0.689 1.092 0.000
z 0.000 0.000 1.425
Polar
3z2-r22.850
x2-y2-2.407
xy-0.689
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.625 0.210 0.000
y 0.210 4.069 0.000
z 0.000 0.000 2.878


<r2> (average value of r2) Å2
<r2> 47.085
(<r2>)1/2 6.862