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 C2H2O4 (Oxalic Acid)

using model chemistry: BLYP/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2H 1Ag
Energy calculated at BLYP/6-31G**
 hartrees
Energy at 0K-378.272686
Energy at 298.15K-378.276629
HF Energy-378.272686
Nuclear repulsion energy231.048101
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/6-31G**
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Ag 3451 3424 0.00      
2 Ag 1756 1743 0.00      
3 Ag 1396 1385 0.00      
4 Ag 1179 1170 0.00      
5 Ag 785 779 0.00      
6 Ag 544 540 0.00      
7 Ag 387 384 0.00      
8 Au 715 709 177.64      
9 Au 428 424 45.92      
10 Au 130 129 5.17      
11 Bg 756 750 0.00      
12 Bg 695 689 0.00      
13 Bu 3454 3427 186.73      
14 Bu 1790 1776 306.94      
15 Bu 1306 1296 763.12      
16 Bu 1164 1155 29.59      
17 Bu 639 634 19.18      
18 Bu 254 252 54.40      

Unscaled Zero Point Vibrational Energy (zpe) 10412.8 cm-1
Scaled (by 0.9923) Zero Point Vibrational Energy (zpe) 10332.6 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/6-31G**
ABC
0.18757 0.12542 0.07516

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

Point Group is C2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.055 0.775 0.000
C2 0.055 -0.775 0.000
O3 1.142 1.387 0.000
O4 -1.142 -1.387 0.000
O5 -1.142 1.340 0.000
O6 1.142 -1.340 0.000
H7 1.810 0.654 0.000
H8 -1.810 -0.654 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 O4 O5 O6 H7 H8
C11.55431.34402.41951.22462.43001.86902.2630
C21.55432.41951.34402.43001.22462.26301.8690
O31.34402.41953.59242.28412.72630.99183.5883
O42.41951.34403.59242.72632.28413.58830.9918
O51.22462.43002.28412.72633.52053.03052.1023
O62.43001.22462.72632.28413.52052.10233.0305
H71.86902.26300.99183.58833.03052.10233.8488
H82.26301.86903.58830.99182.10233.03053.8488

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 112.997 C1 C2 O6 121.512
C1 O3 H7 105.296 C2 C1 O3 112.997
C2 C1 O5 121.512 C2 O4 H8 105.296
O3 C1 O5 125.491 O4 C2 O6 125.491
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.521      
2 C 0.521      
3 O -0.425      
4 O -0.425      
5 O -0.428      
6 O -0.428      
7 H 0.332      
8 H 0.332      


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 -29.983 3.452 0.000
y 3.452 -41.274 0.000
z 0.000 0.000 -31.225
Traceless
 xyz
x 6.266 3.452 0.000
y 3.452 -10.670 0.000
z 0.000 0.000 4.404
Polar
3z2-r28.808
x2-y211.291
xy3.452
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.660 -0.190 0.000
y -0.190 4.998 0.000
z 0.000 0.000 2.375


<r2> (average value of r2) Å2
<r2> 137.186
(<r2>)1/2 11.713