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: MP2=FULL/6-31+G**

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/6-31+G**
 hartrees
Energy at 0K-228.486364
Energy at 298.15K-228.491178
HF Energy-227.825810
Nuclear repulsion energy120.666928
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/6-31+G**
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' 3797 3566 72.60      
2 A' 3281 3082 2.74      
3 A' 3148 2956 1.91      
4 A' 1821 1710 294.72      
5 A' 1524 1431 15.52      
6 A' 1455 1366 54.82      
7 A' 1357 1275 72.97      
8 A' 1217 1143 185.95      
9 A' 1029 966 79.90      
10 A' 881 828 6.08      
11 A' 581 545 40.59      
12 A' 428 402 4.21      
13 A" 3241 3044 2.17      
14 A" 1524 1431 10.07      
15 A" 1089 1023 4.36      
16 A" 659 619 109.31      
17 A" 549 516 30.66      
18 A" 68 64 0.40      

Unscaled Zero Point Vibrational Energy (zpe) 13823.1 cm-1
Scaled (by 0.9392) Zero Point Vibrational Energy (zpe) 12982.6 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/6-31+G**
ABC
0.37258 0.31621 0.17662

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.081 -0.886 0.000
C2 0.000 0.153 0.000
O3 0.160 1.362 0.000
H4 2.048 -0.398 0.000
H5 0.977 -1.518 0.879
H6 0.977 -1.518 -0.879
O7 -1.236 -0.421 0.000
H8 -1.878 0.308 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 O7 H8
C11.49892.42941.08351.08751.08752.36253.1904
C21.49891.21992.12092.12602.12601.36281.8844
O32.42941.21992.58173.12053.12052.26492.2942
H41.08352.12092.58171.78131.78133.28403.9891
H51.08752.12603.12051.78131.75762.62163.5015
H61.08752.12603.12051.78131.75762.62163.5015
O72.36251.36282.26493.28402.62162.62160.9720
H83.19041.88442.29423.98913.50153.50150.9720

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 126.343 C1 C2 O7 111.203
C2 C1 H4 109.380 C2 C1 H5 109.542
C2 C1 H6 109.542 C2 O7 H8 106.422
O3 C2 O7 122.454 H4 C1 H5 110.268
H4 C1 H6 110.268 H5 C1 H6 107.819
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability