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 CHOCOOH (oxo acetic acid)

using model chemistry: HF/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 HF/3-21G*
 hartrees
Energy at 0K-299.777797
Energy at 298.15K-299.781162
HF Energy-299.777797
Nuclear repulsion energy163.871161
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 HF/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' 3849 3474 121.14      
2 A' 3301 2980 22.03      
3 A' 2027 1830 182.35      
4 A' 1914 1727 102.28      
5 A' 1480 1336 29.54      
6 A' 1408 1271 429.28      
7 A' 1290 1165 10.91      
8 A' 918 829 58.01      
9 A' 734 662 20.43      
10 A' 547 494 6.58      
11 A' 305 276 41.76      
12 A" 1154 1042 10.20      
13 A" 670 605 5.54      
14 A" 628 567 230.80      
15 A" 229 207 29.50      

Unscaled Zero Point Vibrational Energy (zpe) 10227.3 cm-1
Scaled (by 0.9026) Zero Point Vibrational Energy (zpe) 9231.1 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 HF/3-21G*
ABC
0.36739 0.15619 0.10959

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.767 -0.730 0.000
C2 0.000 0.576 0.000
O3 -0.174 -1.782 0.000
O4 -0.548 1.637 0.000
O5 1.329 0.404 0.000
H6 -1.839 -0.624 0.000
H7 1.586 -0.530 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 O4 O5 H6 H7
C11.51451.20712.37782.38311.07682.3614
C21.51452.36371.19471.33962.19521.9335
O31.20712.36373.43932.65262.02762.1593
O42.37781.19473.43932.24522.60373.0417
O52.38311.33962.65262.24523.32980.9696
H61.07682.19522.02762.60373.32983.4257
H72.36141.93352.15933.04170.96963.4257

picture of oxo acetic acid state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 O4 122.284 C1 C2 O5 113.083
C2 C1 O3 120.145 C2 C1 H6 114.753
C2 O5 H7 112.732 O3 C1 H6 125.102
O4 C2 O5 124.634
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.261      
2 C 0.814      
3 O -0.508      
4 O -0.557      
5 O -0.717      
6 H 0.270      
7 H 0.437      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.761 -2.304 0.000 2.427
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.730 -0.545 0.000
y -0.545 -37.778 0.000
z 0.000 0.000 -26.176
Traceless
 xyz
x 6.247 -0.545 0.000
y -0.545 -11.825 0.000
z 0.000 0.000 5.578
Polar
3z2-r211.155
x2-y212.048
xy-0.545
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.620 -1.011 0.000
y -1.011 4.534 0.000
z 0.000 0.000 1.383


<r2> (average value of r2) Å2
<r2> 98.868
(<r2>)1/2 9.943