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: PBEPBEultrafine/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 PBEPBEultrafine/6-31G*
 hartrees
Energy at 0K-228.822626
Energy at 298.15K-228.827338
HF Energy-228.822626
Nuclear repulsion energy120.001598
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 PBEPBEultrafine/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3562 3503 26.10      
2 A' 3130 3078 4.60      
3 A' 3009 2960 1.67      
4 A' 1803 1773 253.46      
5 A' 1453 1429 14.70      
6 A' 1381 1359 61.19      
7 A' 1320 1298 16.59      
8 A' 1182 1163 197.21      
9 A' 969 953 54.76      
10 A' 847 833 2.95      
11 A' 562 553 38.70      
12 A' 407 400 4.63      
13 A" 3077 3026 3.83      
14 A" 1457 1433 9.94      
15 A" 1037 1020 8.69      
16 A" 682 671 99.80      
17 A" 531 522 16.44      
18 A" 61 60 0.80      

Unscaled Zero Point Vibrational Energy (zpe) 13234.7 cm-1
Scaled (by 0.9835) Zero Point Vibrational Energy (zpe) 13016.4 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 PBEPBEultrafine/6-31G*
ABC
0.37018 0.31177 0.17481

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.072 -0.909 0.000
C2 0.000 0.157 0.000
O3 0.180 1.364 0.000
H4 2.061 -0.433 0.000
H5 0.965 -1.555 0.887
H6 0.965 -1.555 -0.887
O7 -1.250 -0.402 0.000
H8 -1.866 0.367 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 O7 H8
C11.51112.44091.09771.10271.10272.37583.2023
C21.51111.22032.14382.15582.15581.36901.8775
O32.44091.22032.60123.14963.14962.27232.2759
H41.09772.14382.60121.80161.80163.31084.0074
H51.10272.15583.14961.80161.77452.64963.5346
H61.10272.15583.14961.80161.77452.64963.5346
O72.37581.36902.27233.31082.64962.64960.9854
H83.20231.87752.27594.00743.53463.53460.9854

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 126.338 C1 C2 O7 111.067
C2 C1 H4 109.509 C2 C1 H5 110.157
C2 C1 H6 110.157 C2 O7 H8 104.596
O3 C2 O7 122.595 H4 C1 H5 109.925
H4 C1 H6 109.925 H5 C1 H6 107.142
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBEultrafine/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.560      
2 C 0.506      
3 O -0.419      
4 H 0.198      
5 H 0.199      
6 H 0.199      
7 O -0.519      
8 H 0.398      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.400 -1.473 0.000 1.526
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.754 -3.539 -0.001
y -3.539 -26.459 -0.004
z -0.001 -0.004 -22.764
Traceless
 xyz
x 4.857 -3.539 -0.001
y -3.539 -5.200 -0.004
z -0.001 -0.004 0.343
Polar
3z2-r20.685
x2-y26.705
xy-3.539
xz-0.001
yz-0.004


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.682 -0.159 0.001
y -0.159 4.741 0.000
z 0.001 0.000 2.829


<r2> (average value of r2) Å2
<r2> 71.598
(<r2>)1/2 8.462