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/3-21G

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/3-21G
 hartrees
Energy at 0K-226.964197
Energy at 298.15K-226.969062
HF Energy-226.529364
Nuclear repulsion energy118.780014
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/3-21G
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' 3502 3343 16.21      
2 A' 3219 3074 4.98      
3 A' 3116 2975 1.03      
4 A' 1753 1674 129.81      
5 A' 1575 1503 21.80      
6 A' 1479 1412 29.50      
7 A' 1389 1326 35.81      
8 A' 1186 1133 152.69      
9 A' 1010 964 140.61      
10 A' 831 793 3.82      
11 A' 567 541 42.33      
12 A' 408 390 3.60      
13 A" 3187 3043 3.33      
14 A" 1582 1511 9.35      
15 A" 1132 1081 7.33      
16 A" 662 632 135.34      
17 A" 554 529 31.35      
18 A" 112 107 0.94      

Unscaled Zero Point Vibrational Energy (zpe) 13631.1 cm-1
Scaled (by 0.9548) Zero Point Vibrational Energy (zpe) 13014.9 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=FULL/3-21G
ABC
0.35777 0.30917 0.17118

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.156 -0.813 0.000
C2 0.000 0.167 0.000
O3 0.050 1.402 0.000
H4 2.093 -0.257 0.000
H5 1.092 -1.451 0.886
H6 1.092 -1.451 -0.886
O7 -1.208 -0.539 0.000
H8 -1.947 0.129 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 O7 H8
C11.51552.47621.08991.09311.09312.37933.2426
C21.51551.23612.13512.14382.14381.39881.9473
O32.47621.23612.63163.16423.16422.31252.3678
H41.08992.13512.63161.79201.79203.31234.0579
H51.09312.14383.16421.79201.77112.62813.5382
H61.09312.14383.16421.79201.77112.62813.5382
O72.37931.39882.31253.31232.62812.62810.9962
H83.24261.94732.36784.05793.53823.53820.9962

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 128.008 C1 C2 O7 109.390
C2 C1 H4 108.971 C2 C1 H5 109.467
C2 C1 H6 109.467 C2 O7 H8 107.604
O3 C2 O7 122.602 H4 C1 H5 110.349
H4 C1 H6 110.349 H5 C1 H6 108.222
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability