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All results from a given calculation for C2H2O4 (Oxalic Acid)

using model chemistry: B3PW91/STO-3G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2H 1Ag
Energy calculated at B3PW91/STO-3G
 hartrees
Energy at 0K-373.052811
Energy at 298.15K 
HF Energy-373.052811
Nuclear repulsion energy232.098838
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 B3PW91/STO-3G
Rotational Constants (cm-1) from geometry optimized at B3PW91/STO-3G
See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/STO-3G

Point Group is C2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.037 0.777 0.000
C2 0.037 -0.777 0.000
O3 1.231 1.254 0.000
O4 -1.231 -1.254 0.000
O5 -1.231 1.232 0.000
O6 1.231 -1.232 0.000
H7 1.672 0.238 0.000
H8 -1.672 -0.238 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 O4 O5 O6 H7 H8
C11.55491.35482.35551.27762.37541.79181.9238
C21.55492.35551.35482.37541.27761.92381.7918
O31.35482.35553.51432.46162.48631.10783.2635
O42.35551.35483.51432.48632.46163.26351.1078
O51.27762.37542.46162.48633.48313.06811.5348
O62.37541.27762.48632.46163.48311.53483.0681
H71.79181.92381.10783.26353.06811.53483.3772
H81.92381.79183.26351.10781.53483.06813.3772

picture of Oxalic Acid state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 O4 107.904 C1 C2 O6 113.630
C1 O3 H7 92.818 C2 C1 O3 107.904
C2 C1 O5 113.630 C2 O4 H8 92.818
O3 C1 O5 138.467 O4 C2 O6 138.467
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.181      
2 C 0.181      
3 O -0.199      
4 O -0.199      
5 O -0.204      
6 O -0.204      
7 H 0.223      
8 H 0.223      


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


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -30.777 0.509 0.000
y 0.509 -35.388 0.000
z 0.000 0.000 -28.076
Traceless
 xyz
x 0.956 0.509 0.000
y 0.509 -5.962 0.000
z 0.000 0.000 5.006
Polar
3z2-r210.012
x2-y24.612
xy0.509
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> 130.505
(<r2>)1/2 11.424