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/6-311G**

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/6-311G**
 hartrees
Energy at 0K-378.389931
Energy at 298.15K-378.393899
HF Energy-378.389931
Nuclear repulsion energy231.455370
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/6-311G**
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 3478 3464 0.00      
2 Ag 1744 1737 0.00      
3 Ag 1376 1371 0.00      
4 Ag 1166 1162 0.00      
5 Ag 780 777 0.00      
6 Ag 543 541 0.00      
7 Ag 387 385 0.00      
8 Au 702 700 177.92      
9 Au 436 434 46.93      
10 Au 127 126 5.25      
11 Bg 785 781 0.00      
12 Bg 693 690 0.00      
13 Bu 3480 3467 205.41      
14 Bu 1774 1767 357.97      
15 Bu 1300 1294 728.50      
16 Bu 1142 1138 58.34      
17 Bu 646 644 20.90      
18 Bu 253 252 53.68      

Unscaled Zero Point Vibrational Energy (zpe) 10404.9 cm-1
Scaled (by 0.9961) Zero Point Vibrational Energy (zpe) 10364.3 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/6-311G**
ABC
0.18916 0.12507 0.07529

See section I.F.4 to change rotational constant units
Geometric Data calculated at BLYP/6-311G**

Point Group is C2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.058 0.777 0.000
C2 0.058 -0.777 0.000
O3 1.137 1.391 0.000
O4 -1.137 -1.391 0.000
O5 -1.137 1.338 0.000
O6 1.137 -1.338 0.000
H7 1.811 0.670 0.000
H8 -1.811 -0.670 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 O4 O5 O6 H7 H8
C11.55821.34282.42171.21622.42861.87162.2735
C21.55822.42171.34282.42861.21622.27351.8716
O31.34282.42173.59282.27402.72880.98713.5969
O42.42171.34283.59282.72882.27403.59690.9871
O51.21622.42862.27402.72883.51103.02242.1181
O62.42861.21622.72882.27403.51102.11813.0224
H71.87162.27350.98713.59693.02242.11813.8621
H82.27351.87163.59690.98712.11813.02243.8621

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 112.979 C1 C2 O6 121.692
C1 O3 H7 105.877 C2 C1 O3 112.979
C2 C1 O5 121.692 C2 O4 H8 105.877
O3 C1 O5 125.329 O4 C2 O6 125.329
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/6-311G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.262      
2 C 0.262      
3 O -0.235      
4 O -0.235      
5 O -0.285      
6 O -0.285      
7 H 0.257      
8 H 0.257      


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 -30.571 3.552 0.000
y 3.552 -42.118 0.000
z 0.000 0.000 -31.646
Traceless
 xyz
x 6.311 3.552 0.000
y 3.552 -11.009 0.000
z 0.000 0.000 4.698
Polar
3z2-r29.396
x2-y211.547
xy3.552
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.787 -0.183 0.000
y -0.183 5.138 0.000
z 0.000 0.000 2.611


<r2> (average value of r2) Å2
<r2> 137.404
(<r2>)1/2 11.722