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

using model chemistry: MP2/CEP-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/CEP-31G
 hartrees
Energy at 0K-44.981543
Energy at 298.15K-44.986262
HF Energy-44.598462
Nuclear repulsion energy65.354678
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/CEP-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' 3640 3517 38.26      
2 A' 3202 3094 18.62      
3 A' 3069 2966 8.73      
4 A' 1667 1611 181.22      
5 A' 1510 1459 24.39      
6 A' 1457 1408 28.02      
7 A' 1319 1274 60.98      
8 A' 1174 1135 161.49      
9 A' 1007 973 134.96      
10 A' 817 790 32.86      
11 A' 539 520 39.04      
12 A' 399 386 5.30      
13 A" 3173 3066 18.22      
14 A" 1504 1453 13.93      
15 A" 1105 1067 5.82      
16 A" 629 608 187.72      
17 A" 527 510 19.37      
18 A" 83 80 0.77      

Unscaled Zero Point Vibrational Energy (zpe) 13409.8 cm-1
Scaled (by 0.9663) Zero Point Vibrational Energy (zpe) 12957.9 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/CEP-31G
ABC
0.34430 0.29654 0.16436

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.201 -0.800 0.000
C2 0.000 0.161 0.000
O3 0.022 1.428 0.000
H4 2.135 -0.211 0.000
H5 1.155 -1.449 0.897
H6 1.155 -1.449 -0.897
O7 -1.228 -0.567 0.000
H8 -2.001 0.057 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 O7 H8
C11.53802.52101.10511.10791.10792.44023.3139
C21.53801.26772.16752.17482.17481.42802.0033
O32.52101.26772.67433.21963.21962.35522.4442
H41.10512.16752.67431.81621.81623.38264.1446
H51.10792.17483.21961.81621.79412.69493.6094
H61.10792.17483.21961.81621.79412.69493.6094
O72.44021.42802.35523.38262.69492.69490.9926
H83.31392.00332.44424.14463.60943.60940.9926

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 127.670 C1 C2 O7 110.664
C2 C1 H4 109.080 C2 C1 H5 109.489
C2 C1 H6 109.489 C2 O7 H8 110.413
O3 C2 O7 121.666 H4 C1 H5 110.313
H4 C1 H6 110.313 H5 C1 H6 108.140
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability