return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for CH3COOH (Acetic acid)

using model chemistry: CISD/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 CISD/6-31G*
 hartrees
Energy at 0K-228.358227
Energy at 298.15K-228.363178
HF Energy-227.809650
Nuclear repulsion energy121.586802
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 CISD/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' 3862 3576 75.84      
2 A' 3296 3052 5.13      
3 A' 3179 2943 1.51      
4 A' 1961 1815 331.36      
5 A' 1563 1447 13.19      
6 A' 1515 1402 83.40      
7 A' 1434 1328 34.25      
8 A' 1299 1203 225.89      
9 A' 1069 990 52.22      
10 A' 917 849 1.69      
11 A' 611 565 51.86      
12 A' 438 405 4.45      
13 A" 3253 3012 4.43      
14 A" 1564 1448 8.84      
15 A" 1135 1051 10.53      
16 A" 706 654 129.57      
17 A" 570 527 26.16      
18 A" 97 90 0.35      

Unscaled Zero Point Vibrational Energy (zpe) 14233.8 cm-1
Scaled (by 0.9258) Zero Point Vibrational Energy (zpe) 13177.7 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 CISD/6-31G*
ABC
0.38180 0.31807 0.17926

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.051 -0.915 0.000
C2 0.000 0.154 0.000
O3 0.196 1.340 0.000
H4 2.033 -0.454 0.000
H5 0.932 -1.545 0.879
H6 0.932 -1.545 -0.879
O7 -1.239 -0.373 0.000
H8 -1.857 0.371 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 O7 H8
C11.49912.41161.08441.08851.08852.35353.1796
C21.49911.20212.12212.12832.12831.34691.8694
O32.41161.20212.56803.10503.10502.23512.2698
H41.08442.12212.56801.78221.78223.27333.9764
H51.08852.12833.10501.78221.75782.61913.4961
H61.08852.12833.10501.78221.75782.61913.4961
O72.35351.34692.23513.27332.61912.61910.9674
H83.17961.86942.26983.97643.49613.49610.9674

picture of Acetic acid state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 O3 126.097 C1 C2 O7 111.467
C2 C1 H4 109.397 C2 C1 H5 109.651
C2 C1 H6 109.651 C2 O7 H8 106.609
O3 C2 O7 122.436 H4 C1 H5 110.212
H4 C1 H6 110.212 H5 C1 H6 107.696
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability