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: B1B95/6-31+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 B1B95/6-31+G**
 hartrees
Energy at 0K-229.016954
Energy at 298.15K-229.021749
Nuclear repulsion energy121.256617
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 B1B95/6-31+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' 3801 3636 65.61      
2 A' 3212 3072 3.11      
3 A' 3085 2951 1.33      
4 A' 1856 1776 365.14      
5 A' 1469 1405 15.38      
6 A' 1415 1354 96.67      
7 A' 1341 1283 43.71      
8 A' 1213 1160 204.07      
9 A' 1000 956 51.60      
10 A' 879 841 2.98      
11 A' 582 557 43.38      
12 A' 418 400 4.66      
13 A" 3162 3025 2.33      
14 A" 1475 1411 11.63      
15 A" 1061 1015 8.52      
16 A" 674 645 108.24      
17 A" 546 522 25.78      
18 A" 68 65 0.38      

Unscaled Zero Point Vibrational Energy (zpe) 13627.7 cm-1
Scaled (by 0.9566) Zero Point Vibrational Energy (zpe) 13036.3 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 B1B95/6-31+G**
ABC
0.37958 0.31678 0.17838

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/6-31+G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.063 -0.903 0.000
C2 0.000 0.152 0.000
O3 0.182 1.346 0.000
H4 2.043 -0.432 0.000
H5 0.952 -1.540 0.880
H6 0.952 -1.540 -0.880
O7 -1.239 -0.388 0.000
H8 -1.865 0.352 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 O7 H8
C11.49752.41601.08711.09191.09192.35903.1855
C21.49751.20852.12432.13132.13131.35141.8756
O32.41601.20852.57403.11423.11422.24192.2754
H41.08712.12432.57401.78641.78643.28203.9853
H51.09192.13133.11421.78641.76002.62733.5055
H61.09192.13133.11421.78641.76002.62733.5055
O72.35901.35142.24193.28202.62732.62730.9690
H83.18551.87562.27543.98533.50553.50550.9690

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 126.131 C1 C2 O7 111.691
C2 C1 H4 109.533 C2 C1 H5 109.800
C2 C1 H6 109.800 C2 O7 H8 106.699
O3 C2 O7 122.178 H4 C1 H5 110.136
H4 C1 H6 110.136 H5 C1 H6 107.409
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/6-31+G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.480      
2 C 0.412      
3 O -0.453      
4 H 0.194      
5 H 0.194      
6 H 0.194      
7 O -0.428      
8 H 0.367      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.300 -1.749 0.000 1.774
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.130 -3.930 0.000
y -3.930 -27.604 0.000
z 0.000 0.000 -23.252
Traceless
 xyz
x 5.297 -3.930 0.000
y -3.930 -5.912 0.000
z 0.000 0.000 0.615
Polar
3z2-r21.230
x2-y27.473
xy-3.930
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.003 -0.033 0.000
y -0.033 5.399 0.000
z 0.000 0.000 3.443


<r2> (average value of r2) Å2
<r2> 70.907
(<r2>)1/2 8.421