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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: HF/STO-3G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at HF/STO-3G
 hartrees
Energy at 0K-374.353348
Energy at 298.15K-374.357850
Nuclear repulsion energy320.294046
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 HF/STO-3G
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 3734 3049 0.00      
2 Ag 2073 1693 0.00      
3 Ag 1989 1624 0.00      
4 Ag 1351 1103 0.00      
5 Ag 854 698 0.00      
6 Ag 490 400 0.00      
7 Au 1222 998 0.00      
8 Au 426 348 0.00      
9 B1g 878 717 0.00      
10 B1u 3706 3026 64.01      
11 B1u 2055 1678 42.61      
12 B1u 1614 1318 4.41      
13 B1u 1053 860 1.40      
14 B1u 850 694 0.01      
15 B2g 1221 997 0.00      
16 B2g 883 721 0.00      
17 B2g 271 221 0.00      
18 B2u 3732 3047 5.56      
19 B2u 2000 1633 4.61      
20 B2u 1487 1214 82.22      
21 B2u 1251 1022 19.88      
22 B2u 435 355 20.95      
23 B3g 3705 3025 0.00      
24 B3g 1632 1333 0.00      
25 B3g 1395 1139 0.00      
26 B3g 679 554 0.00      
27 B3g 504 411 0.00      
28 B3u 1006 822 37.13      
29 B3u 545 445 0.20      
30 B3u 86 70 5.84      

Unscaled Zero Point Vibrational Energy (zpe) 21563.8 cm-1
Scaled (by 0.8165) Zero Point Vibrational Energy (zpe) 17606.8 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 HF/STO-3G
ABC
0.17185 0.05438 0.04131

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/STO-3G

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.464
C2 0.000 0.000 -1.464
C3 0.000 1.279 0.659
C4 0.000 -1.279 0.659
C5 0.000 -1.279 -0.659
C6 0.000 1.279 -0.659
O7 0.000 0.000 2.691
O8 0.000 0.000 -2.691
H9 0.000 2.201 1.230
H10 0.000 -2.201 1.230
H11 0.000 -2.201 -1.230
H12 0.000 2.201 -1.230

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.92731.51161.51162.47802.47801.22744.15472.21322.21323.47823.4782
C22.92732.47802.47801.51161.51164.15471.22743.47823.47822.21322.2132
C31.51162.47802.55882.87791.31712.40163.58561.08413.52683.95952.1011
C41.51162.47802.55881.31712.87792.40163.58563.52681.08412.10113.9595
C52.47801.51162.87791.31712.55883.58562.40163.95952.10111.08413.5268
C62.47801.51161.31712.87792.55883.58562.40162.10113.95953.52681.0841
O71.22744.15472.40162.40163.58563.58565.38202.64182.64184.49624.4962
O84.15471.22743.58563.58562.40162.40165.38204.49624.49622.64182.6418
H92.21323.47821.08413.52683.95952.10112.64184.49624.40165.04222.4595
H102.21323.47823.52681.08412.10113.95952.64184.49624.40162.45955.0422
H113.47822.21323.95952.10111.08413.52684.49622.64185.04222.45954.4016
H123.47822.21322.10113.95953.52681.08414.49622.64182.45955.04224.4016

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 122.181 C1 C3 H9 116.025
C1 C4 C5 122.181 C1 C4 H10 116.025
C2 C5 C4 122.181 C2 C5 H11 116.025
C2 C6 C3 122.181 C2 C6 H12 116.025
C3 C1 C4 115.637 C3 C1 O7 122.181
C3 C6 H12 121.794 C4 C1 O7 122.181
C4 C5 H11 121.794 C5 C2 C6 115.637
C5 C2 O8 122.181 C5 C4 H10 121.794
C6 C2 O8 122.181 C6 C3 H9 121.794
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.186      
2 C 0.186      
3 C -0.073      
4 C -0.073      
5 C -0.073      
6 C -0.073      
7 O -0.202      
8 O -0.202      
9 H 0.081      
10 H 0.081      
11 H 0.081      
12 H 0.081      


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 -40.657 0.000 0.000
y 0.000 -37.405 0.000
z 0.000 0.000 -53.366
Traceless
 xyz
x 4.728 0.000 0.000
y 0.000 9.607 0.000
z 0.000 0.000 -14.335
Polar
3z2-r2-28.671
x2-y2-3.252
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.250 0.000 0.000
y 0.000 4.869 0.000
z 0.000 0.000 11.253


<r2> (average value of r2) Å2
<r2> 244.050
(<r2>)1/2 15.622