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: BLYP/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 BLYP/3-21G
 hartrees
Energy at 0K-227.749689
Energy at 298.15K-227.754387
Nuclear repulsion energy118.222457
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 BLYP/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' 3288 3270 0.80      
2 A' 3105 3088 7.24      
3 A' 3002 2985 1.66      
4 A' 1717 1708 157.19      
5 A' 1497 1489 20.66      
6 A' 1402 1394 29.09      
7 A' 1323 1315 15.73      
8 A' 1131 1125 137.70      
9 A' 946 941 118.87      
10 A' 794 790 2.65      
11 A' 537 534 34.81      
12 A' 391 389 3.69      
13 A" 3053 3036 5.72      
14 A" 1509 1501 10.10      
15 A" 1069 1063 7.76      
16 A" 663 659 110.46      
17 A" 534 531 21.94      
18 A" 74 74 1.33      

Unscaled Zero Point Vibrational Energy (zpe) 13017.2 cm-1
Scaled (by 0.9945) Zero Point Vibrational Energy (zpe) 12945.6 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 BLYP/3-21G
ABC
0.35499 0.30624 0.16968

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.165 -0.809 0.000
C2 0.000 0.173 0.000
O3 0.038 1.408 0.000
H4 2.110 -0.254 0.000
H5 1.103 -1.457 0.889
H6 1.103 -1.457 -0.889
O7 -1.207 -0.552 0.000
H8 -1.953 0.133 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 O7 H8
C11.52412.48781.09641.10161.10162.38623.2576
C21.52411.23582.15322.15932.15931.40831.9535
O32.48781.23582.65673.18323.18322.32242.3645
H41.09642.15322.65671.80361.80363.33104.0819
H51.10162.15933.18321.80361.77832.63513.5574
H61.10162.15933.18321.80361.77832.63513.5574
O72.38621.40832.32243.33102.63512.63511.0128
H83.25761.95352.36454.08193.55743.55741.0128

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 128.381 C1 C2 O7 108.864
C2 C1 H4 109.418 C2 C1 H5 109.598
C2 C1 H6 109.598 C2 O7 H8 106.440
O3 C2 O7 122.756 H4 C1 H5 110.283
H4 C1 H6 110.283 H5 C1 H6 107.637
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.586      
2 C 0.531      
3 O -0.436      
4 H 0.211      
5 H 0.219      
6 H 0.219      
7 O -0.495      
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
  -0.272 -1.281 0.000 1.310
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.088 -2.862 0.000
y -2.862 -27.394 0.000
z 0.000 0.000 -22.767
Traceless
 xyz
x 5.992 -2.862 0.000
y -2.862 -6.467 0.000
z 0.000 0.000 0.474
Polar
3z2-r20.948
x2-y28.306
xy-2.862
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> 73.256
(<r2>)1/2 8.559