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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: B3PW91/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at B3PW91/6-31+G**
 hartrees
Energy at 0K-381.321426
Energy at 298.15K-381.325833
Nuclear repulsion energy322.370081
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 B3PW91/6-31+G**
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 3227 3099 0.00      
2 Ag 1757 1687 0.00      
3 Ag 1694 1626 0.00      
4 Ag 1165 1118 0.00      
5 Ag 783 752 0.00      
6 Ag 453 435 0.00      
7 Au 1016 976 0.00      
8 Au 335 321 0.00      
9 B1g 753 723 0.00      
10 B1u 3208 3080 1.35      
11 B1u 1756 1686 443.63      
12 B1u 1382 1327 6.24      
13 B1u 948 911 17.63      
14 B1u 760 729 0.64      
15 B2g 1014 974 0.00      
16 B2g 785 753 0.00      
17 B2g 226 217 0.00      
18 B2u 3225 3097 3.42      
19 B2u 1661 1595 18.87      
20 B2u 1330 1277 81.26      
21 B2u 1087 1043 41.82      
22 B2u 412 396 25.13      
23 B3g 3209 3081 0.00      
24 B3g 1403 1347 0.00      
25 B3g 1240 1190 0.00      
26 B3g 602 578 0.00      
27 B3g 450 432 0.00      
28 B3u 901 865 86.49      
29 B3u 511 491 5.32      
30 B3u 92 88 14.88      

Unscaled Zero Point Vibrational Energy (zpe) 18692.5 cm-1
Scaled (by 0.9601) Zero Point Vibrational Energy (zpe) 17946.7 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 B3PW91/6-31+G**
ABC
0.17492 0.05526 0.04199

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-31+G**

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.441
C2 0.000 0.000 -1.441
C3 0.000 1.268 0.672
C4 0.000 -1.268 0.672
C5 0.000 -1.268 -0.672
C6 0.000 1.268 -0.672
O7 0.000 0.000 2.665
O8 0.000 0.000 -2.665
H9 0.000 2.182 1.258
H10 0.000 -2.182 1.258
H11 0.000 -2.182 -1.258
H12 0.000 2.182 -1.258

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.88141.48301.48302.46362.46361.22464.10592.19002.19003.47113.4711
C22.88142.46362.46361.48301.48304.10591.22463.47113.47112.19002.1900
C31.48302.46362.53602.86971.34312.36273.56961.08663.50003.95352.1357
C41.48302.46362.53601.34312.86972.36273.56963.50001.08662.13573.9535
C52.46361.48302.86971.34312.53603.56962.36273.95352.13571.08663.5000
C62.46361.48301.34312.86972.53603.56962.36272.13573.95353.50001.0866
O71.22464.10592.36272.36273.56963.56965.33052.59652.59654.48984.4898
O84.10591.22463.56963.56962.36272.36275.33054.48984.48982.59652.5965
H92.19003.47111.08663.50003.95352.13572.59654.48984.36485.03852.5170
H102.19003.47113.50001.08662.13573.95352.59654.48984.36482.51705.0385
H113.47112.19003.95352.13571.08663.50004.48982.59655.03852.51704.3648
H123.47112.19002.13573.95353.50001.08664.48982.59652.51705.03854.3648

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.240 C1 C3 H9 116.067
C1 C4 C5 121.240 C1 C4 H10 116.067
C2 C5 C4 121.240 C2 C5 H11 116.067
C2 C6 C3 121.240 C2 C6 H12 116.067
C3 C1 C4 117.521 C3 C1 O7 121.240
C3 C6 H12 122.693 C4 C1 O7 121.240
C4 C5 H11 122.693 C5 C2 C6 117.521
C5 C2 O8 121.240 C5 C4 H10 122.693
C6 C2 O8 121.240 C6 C3 H9 122.693
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-31+G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.229      
2 C -0.229      
3 C 0.140      
4 C 0.140      
5 C 0.140      
6 C 0.140      
7 O -0.421      
8 O -0.421      
9 H 0.185      
10 H 0.185      
11 H 0.185      
12 H 0.185      


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 -45.665 0.000 0.000
y 0.000 -37.060 0.000
z 0.000 0.000 -63.086
Traceless
 xyz
x 4.408 0.000 0.000
y 0.000 17.315 0.000
z 0.000 0.000 -21.723
Polar
3z2-r2-43.446
x2-y2-8.605
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.728 0.000 0.000
y 0.000 9.862 0.000
z 0.000 0.000 17.427


<r2> (average value of r2) Å2
<r2> 243.718
(<r2>)1/2 15.611