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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: MP2=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 MP2=FULL/6-31G
 hartrees
Energy at 0K-153.155683
Energy at 298.15K-153.159618
HF Energy-152.838893
Nuclear repulsion energy68.343513
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=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' 3182 3023 12.05 46.27 0.75 0.85
2 A' 3061 2909 3.72 123.58 0.01 0.02
3 A' 3010 2860 111.72 121.07 0.36 0.53
4 A' 1650 1568 46.82 1.38 0.75 0.86
5 A' 1541 1464 24.15 23.67 0.72 0.84
6 A' 1467 1394 25.07 5.34 0.71 0.83
7 A' 1455 1382 2.91 14.36 0.61 0.76
8 A' 1171 1113 23.71 4.75 0.53 0.69
9 A' 926 880 7.24 6.97 0.35 0.51
10 A' 513 487 12.74 1.95 0.49 0.66
11 A" 3138 2982 10.86 65.47 0.75 0.86
12 A" 1548 1470 12.35 18.60 0.75 0.86
13 A" 1175 1117 0.14 0.25 0.75 0.86
14 A" 816 776 1.85 8.74 0.75 0.86
15 A" 148 141 0.61 1.18 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12401.0 cm-1
Scaled (by 0.9501) Zero Point Vibrational Energy (zpe) 11782.2 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=FULL/6-31G
ABC
1.83896 0.32638 0.29245

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.472 0.000
C2 -0.981 -0.682 0.000
O3 1.252 0.334 0.000
H4 -0.442 1.484 0.000
H5 -0.431 -1.630 0.000
H6 -1.628 -0.630 0.887
H7 -1.628 -0.630 -0.887

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.51411.25951.10502.14532.15712.1571
C21.51412.45282.23191.09571.09991.0999
O31.25952.45282.04812.58633.16433.1643
H41.10502.23192.04813.11402.58152.5815
H52.14531.09572.58633.11401.79441.7944
H62.15711.09993.16432.58151.79441.7749
H72.15711.09993.16432.58151.79441.7749

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 109.534 C1 C2 H6 110.217
C1 C2 H7 110.217 C2 C1 O3 124.082
C2 C1 H4 116.022 O3 C1 H4 119.896
H5 C2 H6 109.632 H5 C2 H7 109.632
H6 C2 H7 107.581
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability