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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: B3PW91/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at B3PW91/6-31G*
 hartrees
Energy at 0K-381.301128
Energy at 298.15K-381.305543
Nuclear repulsion energy322.457796
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 B3PW91/6-31G*
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 3233 3093 0.00      
2 Ag 1774 1697 0.00      
3 Ag 1705 1631 0.00      
4 Ag 1173 1122 0.00      
5 Ag 784 750 0.00      
6 Ag 453 434 0.00      
7 Au 1017 973 0.00      
8 Au 335 321 0.00      
9 B1g 759 726 0.00      
10 B1u 3214 3074 2.98      
11 B1u 1776 1699 340.73      
12 B1u 1393 1332 7.06      
13 B1u 951 910 16.96      
14 B1u 760 727 0.90      
15 B2g 1026 982 0.00      
16 B2g 799 765 0.00      
17 B2g 237 227 0.00      
18 B2u 3230 3091 6.55      
19 B2u 1670 1598 17.63      
20 B2u 1336 1278 82.89      
21 B2u 1091 1044 46.40      
22 B2u 412 394 25.68      
23 B3g 3214 3075 0.00      
24 B3g 1411 1350 0.00      
25 B3g 1244 1190 0.00      
26 B3g 603 576 0.00      
27 B3g 449 429 0.00      
28 B3u 908 868 85.07      
29 B3u 514 491 2.97      
30 B3u 96 92 12.93      

Unscaled Zero Point Vibrational Energy (zpe) 18782.3 cm-1
Scaled (by 0.9567) Zero Point Vibrational Energy (zpe) 17969.0 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 B3PW91/6-31G*
ABC
0.17527 0.05522 0.04199

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

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 1.267 0.671
C4 0.000 -1.267 0.671
C5 0.000 -1.267 -0.671
C6 0.000 1.267 -0.671
O7 0.000 0.000 2.666
O8 0.000 0.000 -2.666
H9 0.000 2.181 1.259
H10 0.000 -2.181 1.259
H11 0.000 -2.181 -1.259
H12 0.000 2.181 -1.259

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.88561.48321.48322.46422.46421.22294.10852.18882.18883.47193.4719
C22.88562.46422.46421.48321.48324.10851.22293.47193.47192.18882.1888
C31.48322.46422.53322.86671.34202.36283.56901.08693.49733.95092.1352
C41.48322.46422.53321.34202.86672.36283.56903.49731.08692.13523.9509
C52.46421.48322.86671.34202.53323.56902.36283.95092.13521.08693.4973
C62.46421.48321.34202.86672.53323.56902.36282.13523.95093.49731.0869
O71.22294.10852.36282.36283.56903.56905.33142.59562.59564.48964.4896
O84.10851.22293.56903.56902.36282.36285.33144.48964.48962.59562.5956
H92.18883.47191.08693.49733.95092.13522.59564.48964.36215.03622.5171
H102.18883.47193.49731.08692.13523.95092.59564.48964.36212.51715.0362
H113.47192.18883.95092.13521.08693.49734.48962.59565.03622.51714.3621
H123.47192.18882.13523.95093.49731.08694.48962.59562.51715.03624.3621

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.356 C1 C3 H9 115.924
C1 C4 C5 121.356 C1 C4 H10 115.924
C2 C5 C4 121.356 C2 C5 H11 115.924
C2 C6 C3 121.356 C2 C6 H12 115.924
C3 C1 C4 117.289 C3 C1 O7 121.356
C3 C6 H12 122.721 C4 C1 O7 121.356
C4 C5 H11 122.721 C5 C2 C6 117.289
C5 C2 O8 121.356 C5 C4 H10 122.721
C6 C2 O8 121.356 C6 C3 H9 122.721
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.436      
2 C 0.436      
3 C -0.195      
4 C -0.195      
5 C -0.195      
6 C -0.195      
7 O -0.456      
8 O -0.456      
9 H 0.205      
10 H 0.205      
11 H 0.205      
12 H 0.205      


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 -44.543 0.000 0.000
y 0.000 -36.565 0.000
z 0.000 0.000 -60.075
Traceless
 xyz
x 3.777 0.000 0.000
y 0.000 15.744 0.000
z 0.000 0.000 -19.522
Polar
3z2-r2-39.043
x2-y2-7.978
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.685 0.000 0.000
y 0.000 8.875 0.000
z 0.000 0.000 15.390


<r2> (average value of r2) Å2
<r2> 242.739
(<r2>)1/2 15.580