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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: HF/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 HF/6-31+G**
 hartrees
Energy at 0K-379.254153
Energy at 298.15K-379.258963
Nuclear repulsion energy324.807573
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/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 3390 3066 0.00      
2 Ag 2000 1809 0.00      
3 Ag 1843 1666 0.00      
4 Ag 1263 1142 0.00      
5 Ag 820 742 0.00      
6 Ag 482 436 0.00      
7 Au 1128 1020 0.00      
8 Au 376 340 0.00      
9 B1g 831 751 0.00      
10 B1u 3371 3048 0.65      
11 B1u 1978 1789 776.07      
12 B1u 1503 1359 3.43      
13 B1u 1027 928 15.87      
14 B1u 807 730 0.33      
15 B2g 1113 1006 0.00      
16 B2g 839 759 0.00      
17 B2g 240 217 0.00      
18 B2u 3389 3064 2.99      
19 B2u 1822 1647 9.12      
20 B2u 1431 1294 104.02      
21 B2u 1175 1062 43.53      
22 B2u 449 406 36.83      
23 B3g 3371 3048 0.00      
24 B3g 1528 1382 0.00      
25 B3g 1340 1211 0.00      
26 B3g 647 585 0.00      
27 B3g 490 443 0.00      
28 B3u 986 891 125.35      
29 B3u 559 505 2.67      
30 B3u 94 85 18.84      

Unscaled Zero Point Vibrational Energy (zpe) 20143.6 cm-1
Scaled (by 0.9042) Zero Point Vibrational Energy (zpe) 18213.8 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/6-31+G**
ABC
0.17407 0.05650 0.04266

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.437
C2 0.000 0.000 -1.437
C3 0.000 1.273 0.662
C4 0.000 -1.273 0.662
C5 0.000 -1.273 -0.662
C6 0.000 1.273 -0.662
O7 0.000 0.000 2.632
O8 0.000 0.000 -2.632
H9 0.000 2.177 1.244
H10 0.000 -2.177 1.244
H11 0.000 -2.177 -1.244
H12 0.000 2.177 -1.244

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.87321.48961.48962.45472.45471.19494.06812.18542.18543.45283.4528
C22.87322.45472.45471.48961.48964.06811.19493.45283.45282.18542.1854
C31.48962.45472.54522.86941.32482.34463.53121.07493.49813.94102.1096
C41.48962.45472.54521.32482.86942.34463.53123.49811.07492.10963.9410
C52.45471.48962.86941.32482.54523.53122.34463.94102.10961.07493.4981
C62.45471.48961.32482.86942.54523.53122.34462.10963.94103.49811.0749
O71.19494.06812.34462.34463.53123.53125.26312.58172.58174.44464.4446
O84.06811.19493.53123.53122.34462.34465.26314.44464.44462.58172.5817
H92.18543.45281.07493.49813.94102.10962.58174.44464.35375.01402.4871
H102.18543.45283.49811.07492.10963.94102.58174.44464.35372.48715.0140
H113.45282.18543.94102.10961.07493.49814.44462.58175.01402.48714.3537
H123.45282.18542.10963.94103.49811.07494.44462.58172.48715.01404.3537

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.314 C1 C3 H9 115.959
C1 C4 C5 121.314 C1 C4 H10 115.959
C2 C5 C4 121.314 C2 C5 H11 115.959
C2 C6 C3 121.314 C2 C6 H12 115.959
C3 C1 C4 117.373 C3 C1 O7 121.314
C3 C6 H12 122.727 C4 C1 O7 121.314
C4 C5 H11 122.727 C5 C2 C6 117.373
C5 C2 O8 121.314 C5 C4 H10 122.727
C6 C2 O8 121.314 C6 C3 H9 122.727
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31+G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.143      
2 C -0.143      
3 C 0.113      
4 C 0.113      
5 C 0.113      
6 C 0.113      
7 O -0.498      
8 O -0.498      
9 H 0.207      
10 H 0.207      
11 H 0.207      
12 H 0.207      


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 -46.400 0.000 0.000
y 0.000 -37.515 0.000
z 0.000 0.000 -65.182
Traceless
 xyz
x 4.949 0.000 0.000
y 0.000 18.276 0.000
z 0.000 0.000 -23.224
Polar
3z2-r2-46.448
x2-y2-8.885
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.693 0.000 0.000
y 0.000 8.592 0.000
z 0.000 0.000 16.618


<r2> (average value of r2) Å2
<r2> 241.146
(<r2>)1/2 15.529