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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: CID/6-311+G(3df,2p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at CID/6-311+G(3df,2p)
 hartrees
Energy at 0K-153.489520
Energy at 298.15K 
HF Energy-152.974561
Nuclear repulsion energy70.312989
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 CID/6-311+G(3df,2p)
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' 3252 3005 8.03      
2 A' 3132 2894 2.83      
3 A' 3035 2804 90.48      
4 A' 1923 1777 194.67      
5 A' 1526 1410 20.77      
6 A' 1487 1374 14.16      
7 A' 1448 1338 14.29      
8 A' 1181 1091 24.29      
9 A' 933 862 5.45      
10 A' 527 487 16.28      
11 A" 3200 2957 7.55      
12 A" 1536 1420 9.45      
13 A" 1194 1103 0.13      
14 A" 812 750 0.94      
15 A" 162 150 2.16      

Unscaled Zero Point Vibrational Energy (zpe) 12674.1 cm-1
Scaled (by 0.924) Zero Point Vibrational Energy (zpe) 11710.8 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 CID/6-311+G(3df,2p)
ABC
1.93383 0.34421 0.30865

See section I.F.4 to change rotational constant units
Geometric Data calculated at CID/6-311+G(3df,2p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.461 0.000
C2 -0.923 -0.718 0.000
O3 1.190 0.386 0.000
H4 -0.491 1.445 0.000
H5 -0.361 -1.642 0.000
H6 -1.566 -0.672 0.873
H7 -1.566 -0.672 -0.873

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.49681.19221.09962.13322.12102.1210
C21.49682.38362.20551.08091.08581.0858
O31.19222.38361.98612.55313.07863.0786
H41.09962.20551.98613.08922.53002.5300
H52.13321.08092.55313.08921.77611.7761
H62.12101.08583.07862.53001.77611.7468
H72.12101.08583.07862.53001.77611.7468

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.668 C1 C2 H6 109.392
C1 C2 H7 109.392 C2 C1 O3 124.465
C2 C1 H4 115.455 O3 C1 H4 120.080
H5 C2 H6 110.109 H5 C2 H7 110.109
H6 C2 H7 107.097
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability