return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: B2PLYP=FULL/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=FULL/6-31G*
 hartrees
Energy at 0K-153.666959
Energy at 298.15K-153.670874
HF Energy-153.519362
Nuclear repulsion energy69.483870
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=FULL/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 3036 8.85 49.85 0.72 0.83
2 A' 3079 2920 2.49 117.61 0.02 0.03
3 A' 2950 2798 131.78 123.93 0.34 0.51
4 A' 1821 1727 133.91 5.63 0.55 0.71
5 A' 1511 1433 17.48 22.49 0.70 0.82
6 A' 1458 1383 12.49 9.83 0.60 0.75
7 A' 1424 1351 16.53 5.22 0.74 0.85
8 A' 1153 1094 23.41 3.58 0.47 0.64
9 A' 909 862 7.15 6.13 0.38 0.56
10 A' 510 484 13.23 1.25 0.48 0.65
11 A" 3143 2981 8.50 68.22 0.75 0.86
12 A" 1521 1442 9.55 15.12 0.75 0.86
13 A" 1158 1099 1.13 0.77 0.75 0.86
14 A" 790 750 0.64 7.88 0.75 0.86
15 A" 153 145 0.41 1.10 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12390.9 cm-1
Scaled (by 0.9484) Zero Point Vibrational Energy (zpe) 11751.6 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 B2PLYP=FULL/6-31G*
ABC
1.89492 0.33660 0.30180

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP=FULL/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
C11.50521.21501.11012.14202.14072.1407
C21.50522.41142.21611.09011.09541.0954
O31.21502.41142.01902.57073.11723.1172
H41.11012.21612.01903.10572.54902.5490
H52.14201.09012.57073.10571.79041.7904
H62.14071.09543.11722.54901.79041.7601
H72.14071.09543.11722.54901.79041.7601

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.222 C1 C2 H6 109.806
C1 C2 H7 109.806 C2 C1 O3 124.526
C2 C1 H4 115.011 O3 C1 H4 120.463
H5 C2 H6 110.016 H5 C2 H7 110.016
H6 C2 H7 106.919
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability