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: 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-153.391224
Energy at 298.15K-153.395152
HF Energy-152.920472
Nuclear repulsion energy69.512237
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
(Å4/u)
Dep P Dep U
1 A' 3269 3055 6.58 45.74 0.74 0.85
2 A' 3132 2926 2.02 110.43 0.01 0.03
3 A' 3009 2811 123.13 119.02 0.32 0.49
4 A' 1805 1687 98.20 4.33 0.58 0.74
5 A' 1524 1424 15.01 20.86 0.70 0.83
6 A' 1469 1372 11.82 10.10 0.55 0.71
7 A' 1433 1339 15.17 4.14 0.75 0.86
8 A' 1164 1088 21.93 3.44 0.44 0.62
9 A' 922 862 6.05 5.99 0.38 0.55
10 A' 512 478 13.18 1.31 0.46 0.63
11 A" 3220 3009 6.71 61.20 0.75 0.86
12 A" 1535 1435 8.76 14.16 0.75 0.86
13 A" 1166 1090 0.55 0.75 0.75 0.86
14 A" 797 745 0.55 7.44 0.75 0.86
15 A" 150 140 0.52 0.98 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12553.6 cm-1
Scaled (by 0.9344) Zero Point Vibrational Energy (zpe) 11730.1 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
1.89686 0.33715 0.30218

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 0.463 0.000
C2 -0.947 -0.701 0.000
O3 1.217 0.362 0.000
H4 -0.481 1.458 0.000
H5 -0.391 -1.632 0.000
H6 -1.592 -0.650 0.877
H7 -1.592 -0.650 -0.877

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.50071.22141.10492.13152.13092.1309
C21.50072.41142.20871.08491.08941.0894
O31.22142.41142.02082.56173.11163.1116
H41.10492.20872.02083.09152.53892.5389
H52.13151.08492.56173.09151.78221.7822
H62.13091.08943.11162.53891.78221.7539
H72.13091.08943.11162.53891.78221.7539

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.002 C1 C2 H6 109.688
C1 C2 H7 109.688 C2 C1 O3 124.387
C2 C1 H4 115.079 O3 C1 H4 120.533
H5 C2 H6 110.101 H5 C2 H7 110.101
H6 C2 H7 107.216
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability