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-378.134775
Energy at 298.15K-378.138614
HF Energy-378.134775
Nuclear repulsion energy227.933840
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 3333 3307 0.00      
2 Ag 1666 1653 0.00      
3 Ag 1301 1292 0.00      
4 Ag 1148 1139 0.00      
5 Ag 757 752 0.00      
6 Ag 531 527 0.00      
7 Ag 388 385 0.00      
8 Au 679 674 272.79      
9 Au 419 416 54.02      
10 Au 129 128 5.95      
11 Bg 732 726 0.00      
12 Bg 660 655 0.00      
13 Bu 3331 3305 109.93      
14 Bu 1705 1692 226.61      
15 Bu 1222 1213 704.53      
16 Bu 1120 1112 73.39      
17 Bu 621 616 18.44      
18 Bu 250 248 59.14      

Unscaled Zero Point Vibrational Energy (zpe) 9996.3 cm-1
Scaled (by 0.9924) Zero Point Vibrational Energy (zpe) 9920.3 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/6-31G
ABC
0.18220 0.12285 0.07338

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 0.769 0.000
C2 0.055 -0.769 0.000
O3 1.157 1.407 0.000
O4 -1.157 -1.407 0.000
O5 -1.157 1.351 0.000
O6 1.157 -1.351 0.000
H7 1.886 0.720 0.000
H8 -1.886 -0.720 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 O4 O5 O6 H7 H8
C11.54211.36942.43851.24562.44191.94202.3595
C21.54212.43851.36942.44191.24562.35951.9420
O31.36942.43853.64222.31412.75741.00193.7119
O42.43851.36943.64222.75742.31413.71191.0019
O51.24562.44192.31412.75743.55683.10752.1950
O62.44191.24562.75742.31413.55682.19503.1075
H71.94202.35951.00193.71193.10752.19504.0372
H82.35951.94203.71191.00192.19503.10754.0372

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 113.630 C1 C2 O6 121.958
C1 O3 H7 108.966 C2 C1 O3 113.630
C2 C1 O5 121.958 C2 O4 H8 108.966
O3 C1 O5 124.412 O4 C2 O6 124.412
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 0.434      
2 C 0.434      
3 O -0.471      
4 O -0.471      
5 O -0.354      
6 O -0.354      
7 H 0.391      
8 H 0.391      


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 -29.969 3.655 0.000
y 3.655 -44.444 0.000
z 0.000 0.000 -31.746
Traceless
 xyz
x 8.126 3.655 0.000
y 3.655 -13.586 0.000
z 0.000 0.000 5.460
Polar
3z2-r210.920
x2-y214.475
xy3.655
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 7.008 -0.260 0.000
y -0.260 4.805 0.000
z 0.000 0.000 1.952


<r2> (average value of r2) Å2
<r2> 141.049
(<r2>)1/2 11.876