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: HF/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 HF/6-31G
 hartrees
Energy at 0K-227.701116
Energy at 298.15K-227.706157
Nuclear repulsion energy121.297222
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 HF/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' 3992 3604 92.75      
2 A' 3342 3017 5.91      
3 A' 3223 2910 1.79      
4 A' 1925 1738 361.06      
5 A' 1624 1466 22.55      
6 A' 1584 1431 45.76      
7 A' 1484 1340 101.82      
8 A' 1299 1173 208.19      
9 A' 1128 1019 96.77      
10 A' 931 841 1.62      
11 A' 622 561 64.99      
12 A' 453 409 6.41      
13 A" 3294 2974 4.63      
14 A" 1630 1472 12.12      
15 A" 1205 1088 17.09      
16 A" 701 633 200.71      
17 A" 589 532 54.63      
18 A" 110 100 0.41      

Unscaled Zero Point Vibrational Energy (zpe) 14567.6 cm-1
Scaled (by 0.9029) Zero Point Vibrational Energy (zpe) 13153.1 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 HF/6-31G
ABC
0.37847 0.31740 0.17823

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.101 -0.852 0.000
C2 0.000 0.150 0.000
O3 0.127 1.354 0.000
H4 2.053 -0.347 0.000
H5 1.020 -1.487 0.873
H6 1.020 -1.487 -0.873
O7 -1.222 -0.436 0.000
H8 -1.947 0.185 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 O7 H8
C11.48922.41201.07751.08211.08212.36013.2199
C21.48921.21102.11242.11662.11661.35471.9472
O32.41201.21102.56973.10303.10302.24132.3811
H41.07752.11242.56971.76881.76883.27594.0352
H51.08212.11663.10301.76881.74582.62473.5151
H61.08212.11663.10301.76881.74582.62473.5151
O72.36011.35472.24133.27592.62472.62470.9546
H83.21991.94722.38114.03523.51513.51510.9546

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 126.267 C1 C2 O7 112.081
C2 C1 H4 109.735 C2 C1 H5 109.791
C2 C1 H6 109.791 C2 O7 H8 113.834
O3 C2 O7 121.652 H4 C1 H5 109.974
H4 C1 H6 109.974 H5 C1 H6 107.547
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.516 -0.507    
2 C 0.719 1.131    
3 O -0.547 -0.724    
4 H 0.208 0.128    
5 H 0.209 0.156    
6 H 0.209 0.156    
7 O -0.721 -0.879    
8 H 0.439 0.539    


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.207 -1.927 0.000 1.938
CHELPG -0.216 -1.950 0.000 1.962
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.322 -4.291 0.000
y -4.291 -29.312 0.000
z 0.000 0.000 -23.077
Traceless
 xyz
x 6.873 -4.291 0.000
y -4.291 -8.113 0.000
z 0.000 0.000 1.240
Polar
3z2-r22.480
x2-y29.990
xy-4.291
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.768 0.025 0.000
y 0.025 4.309 0.000
z 0.000 0.000 2.432


<r2> (average value of r2) Å2
<r2> 71.143
(<r2>)1/2 8.435