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: B2PLYP=FULL/cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2H 1Ag
Energy calculated at B2PLYP=FULL/cc-pVTZ
 hartrees
Energy at 0K-378.259500
Energy at 298.15K-378.263651
HF Energy-377.828168
Nuclear repulsion energy234.441587
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 B2PLYP=FULL/cc-pVTZ
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 3657 3495 0.00      
2 Ag 1826 1745 0.00      
3 Ag 1457 1393 0.00      
4 Ag 1235 1180 0.00      
5 Ag 831 795 0.00      
6 Ag 568 543 0.00      
7 Ag 410 392 0.00      
8 Au 720 688 182.81      
9 Au 469 448 48.38      
10 Au 127 122 6.14      
11 Bg 843 806 0.00      
12 Bg 718 686 0.00      
13 Bu 3661 3499 262.67      
14 Bu 1849 1767 414.03      
15 Bu 1346 1287 799.03      
16 Bu 1213 1159 17.32      
17 Bu 676 646 21.46      
18 Bu 266 254 55.00      

Unscaled Zero Point Vibrational Energy (zpe) 10935.5 cm-1
Scaled (by 0.9558) Zero Point Vibrational Energy (zpe) 10452.1 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 B2PLYP=FULL/cc-pVTZ
ABC
0.19368 0.12869 0.07732

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP=FULL/cc-pVTZ

Point Group is C2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.054 0.766 0.000
C2 0.054 -0.766 0.000
O3 1.123 1.371 0.000
O4 -1.123 -1.371 0.000
O5 -1.123 1.319 0.000
O6 1.123 -1.319 0.000
H7 1.797 0.667 0.000
H8 -1.797 -0.667 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 O4 O5 O6 H7 H8
C11.53491.32342.38881.20422.39431.85322.2562
C21.53492.38881.32342.39431.20422.25621.8532
O31.32342.38883.54402.24682.69000.97383.5607
O42.38881.32343.54402.69002.24683.56070.9738
O51.20422.39432.24682.69003.46552.99182.0978
O62.39431.20422.69002.24683.46552.09782.9918
H71.85322.25620.97383.56072.99182.09783.8332
H82.25621.85323.56070.97382.09782.99183.8332

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 113.181 C1 C2 O6 121.411
C1 O3 H7 106.557 C2 C1 O3 113.181
C2 C1 O5 121.411 C2 O4 H8 106.557
O3 C1 O5 125.409 O4 C2 O6 125.409
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability