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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: MP2/6-31G(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 MP2/6-31G(2df,p)
 hartrees
Energy at 0K-153.464417
Energy at 298.15K-153.468349
HF Energy-152.931876
Nuclear repulsion energy69.615902
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 MP2/6-31G(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' 3237 3057 3.44 42.27 0.74 0.85
2 A' 3104 2932 0.84 105.57 0.01 0.02
3 A' 2971 2806 105.92 114.06 0.32 0.48
4 A' 1801 1701 106.30 5.22 0.48 0.65
5 A' 1490 1407 16.80 18.29 0.68 0.81
6 A' 1447 1366 10.41 7.86 0.53 0.69
7 A' 1396 1318 19.92 3.03 0.75 0.85
8 A' 1142 1079 22.10 3.12 0.38 0.55
9 A' 906 855 6.51 5.68 0.34 0.50
10 A' 502 474 12.36 1.12 0.39 0.56
11 A" 3190 3013 2.79 57.00 0.75 0.86
12 A" 1501 1418 8.49 11.04 0.75 0.86
13 A" 1146 1083 0.67 1.07 0.75 0.86
14 A" 783 739 1.06 5.13 0.75 0.86
15 A" 166 157 0.59 0.81 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12389.8 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 11702.2 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 MP2/6-31G(2df,p)
ABC
1.90108 0.33784 0.30289

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.463 0.000
C2 -0.938 -0.712 0.000
O3 1.209 0.376 0.000
H4 -0.495 1.455 0.000
H5 -0.376 -1.644 0.000
H6 -1.586 -0.663 0.878
H7 -1.586 -0.663 -0.878

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.50351.21221.10862.14002.13452.1345
C21.50352.40742.21151.08821.09261.0926
O31.21222.40742.01672.56803.10923.1092
H41.10862.21152.01673.10072.53932.5393
H52.14001.08822.56803.10071.78811.7881
H62.13451.09263.10922.53931.78811.7564
H72.13451.09263.10922.53931.78811.7564

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.293 C1 C2 H6 109.595
C1 C2 H7 109.595 C2 C1 O3 124.523
C2 C1 H4 114.859 O3 C1 H4 120.618
H5 C2 H6 110.156 H5 C2 H7 110.156
H6 C2 H7 106.986
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability