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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: QCISD/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 QCISD/6-311G*
 hartrees
Energy at 0K-380.508468
Energy at 298.15K-380.512738
Nuclear repulsion energy321.289501
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 QCISD/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 3212 3075 0.00      
2 Ag 1795 1719 0.00      
3 Ag 1688 1616 0.00      
4 Ag 1177 1127 0.00      
5 Ag 774 741 0.00      
6 Ag 450 431 0.00      
7 Au 968 927 0.00      
8 Au 324 310 0.00      
9 B1g 747 715 0.00      
10 B1u 3192 3056 2.74      
11 B1u 1777 1701 345.94      
12 B1u 1391 1332 3.78      
13 B1u 951 911 12.16      
14 B1u 756 724 0.00      
15 B2g 959 918 0.00      
16 B2g 737 705 0.00      
17 B2g 181 173 0.00      
18 B2u 3209 3073 8.74      
19 B2u 1675 1604 14.04      
20 B2u 1339 1282 74.03      
21 B2u 1093 1046 50.35      
22 B2u 412 395 26.07      
23 B3g 3192 3056 0.00      
24 B3g 1418 1357 0.00      
25 B3g 1251 1198 0.00      
26 B3g 604 578 0.00      
27 B3g 449 430 0.00      
28 B3u 894 856 94.99      
29 B3u 502 481 4.78      
30 B3u 86 82 12.04      

Unscaled Zero Point Vibrational Energy (zpe) 18601.2 cm-1
Scaled (by 0.9574) Zero Point Vibrational Energy (zpe) 17808.7 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 QCISD/6-311G*
ABC
0.17300 0.05489 0.04167

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.454
C2 0.000 0.000 -1.454
C3 0.000 1.275 0.673
C4 0.000 -1.275 0.673
C5 0.000 -1.275 -0.673
C6 0.000 1.275 -0.673
O7 0.000 0.000 2.671
O8 0.000 0.000 -2.671
H9 0.000 2.192 1.259
H10 0.000 -2.192 1.259
H11 0.000 -2.192 -1.259
H12 0.000 2.192 -1.259

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.90751.49551.49552.47962.47961.21754.12502.20082.20083.48813.4881
C22.90752.47962.47961.49551.49554.12501.21753.48813.48812.20082.2008
C31.49552.47962.55072.88381.34542.37083.57891.08853.51693.96952.1386
C41.49552.47962.55071.34542.88382.37083.57893.51691.08852.13863.9695
C52.47961.49552.88381.34542.55073.57892.37083.96952.13861.08853.5169
C62.47961.49551.34542.88382.55073.57892.37082.13863.96953.51691.0885
O71.21754.12502.37082.37083.57893.57895.34242.60752.60754.50064.5006
O84.12501.21753.57893.57892.37082.37085.34244.50064.50062.60752.6075
H92.20083.48811.08853.51693.96952.13862.60754.50064.38445.05652.5189
H102.20083.48813.51691.08852.13863.96952.60754.50064.38442.51895.0565
H113.48812.20083.96952.13861.08853.51694.50062.60755.05652.51894.3844
H123.48812.20082.13863.96953.51691.08854.50062.60752.51895.05654.3844

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.485 C1 C3 H9 115.898
C1 C4 C5 121.485 C1 C4 H10 115.898
C2 C5 C4 121.485 C2 C5 H11 115.898
C2 C6 C3 121.485 C2 C6 H12 115.898
C3 C1 C4 117.031 C3 C1 O7 121.485
C3 C6 H12 122.617 C4 C1 O7 121.485
C4 C5 H11 122.617 C5 C2 C6 117.031
C5 C2 O8 121.485 C5 C4 H10 122.617
C6 C2 O8 121.485 C6 C3 H9 122.617
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability