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: B3PW91/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B3PW91/6-31G**
 hartrees
Energy at 0K-229.004786
Energy at 298.15K-229.009606
Nuclear repulsion energy121.085334
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 B3PW91/6-31G**
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' 3790 3632 50.31      
2 A' 3204 3071 4.26      
3 A' 3078 2950 1.37      
4 A' 1871 1793 294.19      
5 A' 1477 1416 13.83      
6 A' 1424 1365 92.67      
7 A' 1356 1299 19.79      
8 A' 1222 1171 208.46      
9 A' 1001 960 46.48      
10 A' 876 840 3.07      
11 A' 584 560 44.17      
12 A' 420 402 4.67      
13 A" 3153 3022 3.66      
14 A" 1483 1421 9.60      
15 A" 1065 1021 10.61      
16 A" 689 660 109.04      
17 A" 547 524 20.57      
18 A" 76 73 0.61      

Unscaled Zero Point Vibrational Energy (zpe) 13657.0 cm-1
Scaled (by 0.9584) Zero Point Vibrational Energy (zpe) 13088.9 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 B3PW91/6-31G**
ABC
0.37836 0.31580 0.17781

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-31G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.052 -0.920 0.000
C2 0.000 0.154 0.000
O3 0.200 1.346 0.000
H4 2.040 -0.462 0.000
H5 0.934 -1.557 0.881
H6 0.934 -1.557 -0.881
O7 -1.245 -0.373 0.000
H8 -1.853 0.384 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 O7 H8
C11.50302.42101.08891.09371.09372.36133.1833
C21.50301.20912.13072.13932.13931.35241.8667
O32.42101.20912.57993.12203.12202.24622.2669
H41.08892.13072.57991.78851.78853.28643.9830
H51.09372.13933.12201.78851.76152.63213.5082
H61.09372.13933.12201.78851.76152.63213.5082
O72.36131.35242.24623.28642.63212.63210.9702
H83.18331.86672.26693.98303.50823.50820.9702

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 126.083 C1 C2 O7 111.470
C2 C1 H4 109.547 C2 C1 H5 109.946
C2 C1 H6 109.946 C2 O7 H8 105.800
O3 C2 O7 122.446 H4 C1 H5 110.053
H4 C1 H6 110.053 H5 C1 H6 107.269
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.457      
2 C 0.554      
3 O -0.461      
4 H 0.171      
5 H 0.170      
6 H 0.170      
7 O -0.484      
8 H 0.336      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.435 -1.570 0.000 1.629
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.670 -3.768 0.000
y -3.768 -26.438 0.000
z 0.000 0.000 -22.601
Traceless
 xyz
x 4.850 -3.768 0.000
y -3.768 -5.303 0.000
z 0.000 0.000 0.453
Polar
3z2-r20.906
x2-y26.769
xy-3.768
xz0.000
yz0.000


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


<r2> (average value of r2) Å2
<r2> 70.604
(<r2>)1/2 8.403