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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: B3PW91/6-311G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at B3PW91/6-311G*
 hartrees
Energy at 0K-381.388229
Energy at 298.15K-381.392659
Nuclear repulsion energy323.138188
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 B3PW91/6-311G*
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 3209 3090 0.00      
2 Ag 1760 1694 0.00      
3 Ag 1695 1632 0.00      
4 Ag 1167 1124 0.00      
5 Ag 778 749 0.00      
6 Ag 454 437 0.00      
7 Au 1017 979 0.00      
8 Au 334 321 0.00      
9 B1g 756 727 0.00      
10 B1u 3189 3070 5.40      
11 B1u 1761 1696 389.41      
12 B1u 1384 1332 6.15      
13 B1u 949 913 18.59      
14 B1u 758 730 0.59      
15 B2g 1023 985 0.00      
16 B2g 808 778 0.00      
17 B2g 230 222 0.00      
18 B2u 3207 3087 9.58      
19 B2u 1660 1598 18.05      
20 B2u 1324 1274 79.23      
21 B2u 1086 1045 53.74      
22 B2u 413 398 25.34      
23 B3g 3189 3070 0.00      
24 B3g 1402 1350 0.00      
25 B3g 1236 1189 0.00      
26 B3g 602 580 0.00      
27 B3g 450 433 0.00      
28 B3u 912 878 92.08      
29 B3u 513 494 5.82      
30 B3u 93 90 12.69      

Unscaled Zero Point Vibrational Energy (zpe) 18678.8 cm-1
Scaled (by 0.9627) Zero Point Vibrational Energy (zpe) 17982.0 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 B3PW91/6-311G*
ABC
0.17582 0.05545 0.04216

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-311G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.443
C2 0.000 0.000 -1.443
C3 0.000 1.264 0.669
C4 0.000 -1.264 0.669
C5 0.000 -1.264 -0.669
C6 0.000 1.264 -0.669
O7 0.000 0.000 2.659
O8 0.000 0.000 -2.659
H9 0.000 2.179 1.255
H10 0.000 -2.179 1.255
H11 0.000 -2.179 -1.255
H12 0.000 2.179 -1.255

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.88541.48231.48232.46142.46141.21644.10182.18672.18673.46783.4678
C22.88542.46142.46141.48231.48234.10181.21643.46783.46782.18672.1867
C31.48232.46142.52892.86121.33832.35773.56031.08603.49263.94442.1305
C41.48232.46142.52891.33832.86122.35773.56033.49261.08602.13053.9444
C52.46141.48232.86121.33832.52893.56032.35773.94442.13051.08603.4926
C62.46141.48231.33832.86122.52893.56032.35772.13053.94443.49261.0860
O71.21644.10182.35772.35773.56033.56035.31822.59182.59184.47984.4798
O84.10181.21643.56033.56032.35772.35775.31824.47984.47982.59182.5918
H92.18673.46781.08603.49263.94442.13052.59184.47984.35735.02882.5106
H102.18673.46783.49261.08602.13053.94442.59184.47984.35732.51065.0288
H113.46782.18673.94442.13051.08603.49264.47982.59185.02882.51064.3573
H123.46782.18672.13053.94443.49261.08604.47982.59182.51065.02884.3573

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.458 C1 C3 H9 115.876
C1 C4 C5 121.458 C1 C4 H10 115.876
C2 C5 C4 121.458 C2 C5 H11 115.876
C2 C6 C3 121.458 C2 C6 H12 115.876
C3 C1 C4 117.084 C3 C1 O7 121.458
C3 C6 H12 122.666 C4 C1 O7 121.458
C4 C5 H11 122.666 C5 C2 C6 117.084
C5 C2 O8 121.458 C5 C4 H10 122.666
C6 C2 O8 121.458 C6 C3 H9 122.666
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-311G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.293      
2 C 0.293      
3 C -0.238      
4 C -0.238      
5 C -0.238      
6 C -0.238      
7 O -0.297      
8 O -0.297      
9 H 0.240      
10 H 0.240      
11 H 0.240      
12 H 0.240      


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 -45.405 0.000 0.000
y 0.000 -37.061 0.000
z 0.000 0.000 -60.712
Traceless
 xyz
x 3.481 0.000 0.000
y 0.000 15.998 0.000
z 0.000 0.000 -19.479
Polar
3z2-r2-38.958
x2-y2-8.345
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.334 0.000 0.000
y 0.000 9.233 0.000
z 0.000 0.000 15.669


<r2> (average value of r2) Å2
<r2> 242.326
(<r2>)1/2 15.567