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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: PBEPBE/cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at PBEPBE/cc-pVTZ
 hartrees
Energy at 0K-381.144743
Energy at 298.15K-381.149045
Nuclear repulsion energy321.652856
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 PBEPBE/cc-pVTZ
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 3124 3102 0.00      
2 Ag 1652 1641 0.00      
3 Ag 1625 1614 0.00      
4 Ag 1124 1117 0.00      
5 Ag 761 756 0.00      
6 Ag 442 439 0.00      
7 Au 993 986 0.00      
8 Au 320 317 0.00      
9 B1g 737 732 0.00      
10 B1u 3104 3083 3.67      
11 B1u 1660 1648 305.89      
12 B1u 1337 1328 6.39      
13 B1u 924 917 18.38      
14 B1u 738 733 0.54      
15 B2g 1002 996 0.00      
16 B2g 796 791 0.00      
17 B2g 224 223 0.00      
18 B2u 3121 3100 6.86      
19 B2u 1588 1577 19.23      
20 B2u 1280 1271 66.71      
21 B2u 1047 1040 45.28      
22 B2u 399 396 20.54      
23 B3g 3104 3083 0.00      
24 B3g 1352 1343 0.00      
25 B3g 1195 1187 0.00      
26 B3g 585 581 0.00      
27 B3g 437 434 0.00      
28 B3u 889 882 67.14      
29 B3u 496 492 5.38      
30 B3u 90 89 11.98      

Unscaled Zero Point Vibrational Energy (zpe) 18072.0 cm-1
Scaled (by 0.9931) Zero Point Vibrational Energy (zpe) 17947.3 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 PBEPBE/cc-pVTZ
ABC
0.17531 0.05484 0.04177

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/cc-pVTZ

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.445
C2 0.000 0.000 -1.445
C3 0.000 1.266 0.673
C4 0.000 -1.266 0.673
C5 0.000 -1.266 -0.673
C6 0.000 1.266 -0.673
O7 0.000 0.000 2.676
O8 0.000 0.000 -2.676
H9 0.000 2.184 1.264
H10 0.000 -2.184 1.264
H11 0.000 -2.184 -1.264
H12 0.000 2.184 -1.264

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.88951.48261.48262.46752.46751.23144.12092.19112.19113.47953.4795
C22.88952.46752.46751.48261.48264.12091.23143.47953.47952.19112.1911
C31.48262.46752.53212.86781.34642.36963.58061.09153.49993.95652.1437
C41.48262.46752.53211.34642.86782.36963.58063.49991.09152.14373.9565
C52.46751.48262.86781.34642.53213.58062.36963.95652.14371.09153.4999
C62.46751.48261.34642.86782.53213.58062.36962.14373.95653.49991.0915
O71.23144.12092.36962.36963.58063.58065.35232.60032.60034.50504.5050
O84.12091.23143.58063.58062.36962.36965.35234.50504.50502.60032.6003
H92.19113.47951.09153.49993.95652.14372.60034.50504.36725.04642.5285
H102.19113.47953.49991.09152.14373.95652.60034.50504.36722.52855.0464
H113.47952.19113.95652.14371.09153.49994.50502.60035.04642.52854.3672
H123.47952.19112.14373.95653.49991.09154.50502.60032.52855.04644.3672

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.359 C1 C3 H9 115.852
C1 C4 C5 121.359 C1 C4 H10 115.852
C2 C5 C4 121.359 C2 C5 H11 115.852
C2 C6 C3 121.359 C2 C6 H12 115.852
C3 C1 C4 117.282 C3 C1 O7 121.359
C3 C6 H12 122.789 C4 C1 O7 121.359
C4 C5 H11 122.789 C5 C2 C6 117.282
C5 C2 O8 121.359 C5 C4 H10 122.789
C6 C2 O8 121.359 C6 C3 H9 122.789
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/cc-pVTZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.206      
2 C 0.206      
3 C -0.115      
4 C -0.115      
5 C -0.115      
6 C -0.115      
7 O -0.231      
8 O -0.231      
9 H 0.128      
10 H 0.128      
11 H 0.128      
12 H 0.128      


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 -45.350 0.000 0.000
y 0.000 -37.690 0.000
z 0.000 0.000 -60.874
Traceless
 xyz
x 3.932 0.000 0.000
y 0.000 15.422 0.000
z 0.000 0.000 -19.354
Polar
3z2-r2-38.709
x2-y2-7.660
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.237 0.000 0.000
y 0.000 10.526 0.000
z 0.000 0.000 16.696


<r2> (average value of r2) Å2
<r2> 244.410
(<r2>)1/2 15.634