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: M06-2X/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 M06-2X/3-21G*
 hartrees
Energy at 0K-227.705911
Energy at 298.15K 
HF Energy-227.705911
Nuclear repulsion energy119.945917
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 M06-2X/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' 3530 3344 30.34      
2 A' 3194 3025 1.22      
3 A' 3087 2924 0.01      
4 A' 1849 1752 214.29      
5 A' 1528 1448 22.15      
6 A' 1454 1378 54.99      
7 A' 1395 1321 45.83      
8 A' 1191 1128 197.11      
9 A' 1014 960 82.83      
10 A' 865 819 1.57      
11 A' 580 549 50.72      
12 A' 406 385 4.63      
13 A" 3150 2984 0.43      
14 A" 1538 1457 12.45      
15 A" 1113 1055 14.49      
16 A" 665 630 134.62      
17 A" 551 521 45.85      
18 A" 42i 40i 1.12      

Unscaled Zero Point Vibrational Energy (zpe) 13533.7 cm-1
Scaled (by 0.9472) Zero Point Vibrational Energy (zpe) 12819.1 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 M06-2X/3-21G*
ABC
0.36760 0.31358 0.17474

See section I.F.4 to change rotational constant units
Geometric Data calculated at M06-2X/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.135 -0.825 0.000
C2 0.000 0.165 0.000
O3 0.072 1.382 0.000
H4 2.081 -0.287 0.000
H5 1.058 -1.464 0.883
H6 1.058 -1.464 -0.883
O7 -1.204 -0.504 0.000
H8 -1.946 0.157 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 O7 H8
C11.50572.44951.08831.09321.09322.36093.2340
C21.50571.21932.12942.13422.13421.37761.9464
O32.44951.21932.61203.13933.13932.27732.3606
H41.08832.12942.61201.79211.79213.29234.0517
H51.09322.13423.13931.79211.76672.61193.5270
H61.09322.13423.13931.79211.76672.61193.5270
O72.36091.37762.27733.29232.61192.61190.9943
H83.23401.94642.36064.05173.52703.52700.9943

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 127.718 C1 C2 O7 109.852
C2 C1 H4 109.293 C2 C1 H5 109.382
C2 C1 H6 109.382 C2 O7 H8 109.226
O3 C2 O7 122.430 H4 C1 H5 110.473
H4 C1 H6 110.473 H5 C1 H6 107.813
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at M06-2X/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.643      
2 C 0.613      
3 O -0.486      
4 H 0.237      
5 H 0.245      
6 H 0.245      
7 O -0.591      
8 H 0.380      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.282 -1.411 0.000 1.439
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.047 -3.387 0.000
y -3.387 -27.885 0.000
z 0.000 0.000 -22.795
Traceless
 xyz
x 6.294 -3.387 0.000
y -3.387 -6.964 0.000
z 0.000 0.000 0.671
Polar
3z2-r21.341
x2-y28.839
xy-3.387
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.001 -0.100 0.000
y -0.100 4.075 0.000
z 0.000 0.000 2.255


<r2> (average value of r2) Å2
<r2> 71.760
(<r2>)1/2 8.471