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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: QCISD/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 QCISD/6-31G*
 hartrees
Energy at 0K-380.365008
Energy at 298.15K-380.369280
Nuclear repulsion energy321.256552
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/6-31G*
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 3235 3081 0.00      
2 Ag 1805 1719 0.00      
3 Ag 1702 1621 0.00      
4 Ag 1192 1135 0.00      
5 Ag 785 747 0.00      
6 Ag 455 433 0.00      
7 Au 969 923 0.00      
8 Au 323 308 0.00      
9 B1g 748 712 0.00      
10 B1u 3216 3063 1.42      
11 B1u 1782 1697 312.10      
12 B1u 1407 1340 4.55      
13 B1u 963 917 11.34      
14 B1u 763 726 0.02      
15 B2g 963 917 0.00      
16 B2g 711 677 0.00      
17 B2g 192 183 0.00      
18 B2u 3233 3079 6.18      
19 B2u 1694 1614 13.99      
20 B2u 1360 1295 77.43      
21 B2u 1108 1055 43.79      
22 B2u 414 394 27.79      
23 B3g 3216 3063 0.00      
24 B3g 1435 1367 0.00      
25 B3g 1269 1208 0.00      
26 B3g 608 579 0.00      
27 B3g 455 433 0.00      
28 B3u 883 841 94.16      
29 B3u 503 479 2.10      
30 B3u 88 83 13.44      

Unscaled Zero Point Vibrational Energy (zpe) 18737.8 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 17844.0 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 QCISD/6-31G*
ABC
0.17347 0.05488 0.04169

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.447
C2 0.000 0.000 -1.447
C3 0.000 1.274 0.672
C4 0.000 -1.274 0.672
C5 0.000 -1.274 -0.672
C6 0.000 1.274 -0.672
O7 0.000 0.000 2.674
O8 0.000 0.000 -2.674
H9 0.000 2.189 1.261
H10 0.000 -2.189 1.261
H11 0.000 -2.189 -1.261
H12 0.000 2.189 -1.261

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.89451.49071.49072.47282.47281.22724.12172.19742.19743.48233.4823
C22.89452.47282.47281.49071.49074.12171.22723.48233.48232.19742.1974
C31.49072.47282.54712.88031.34482.37283.58091.08853.51263.96602.1390
C41.49072.47282.54711.34482.88032.37283.58093.51261.08852.13903.9660
C52.47281.49072.88031.34482.54713.58092.37283.96602.13901.08853.5126
C62.47281.49071.34482.88032.54713.58092.37282.13903.96603.51261.0885
O71.22724.12172.37282.37283.58093.58095.34892.60632.60634.50314.5031
O84.12171.22723.58093.58092.37282.37285.34894.50314.50312.60632.6063
H92.19743.48231.08853.51263.96602.13902.60634.50314.37895.05292.5212
H102.19743.48233.51261.08852.13903.96602.60634.50314.37892.52125.0529
H113.48232.19743.96602.13901.08853.51264.50312.60635.05292.52124.3789
H123.48232.19742.13903.96603.51261.08854.50312.60632.52125.05294.3789

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.318 C1 C3 H9 115.974
C1 C4 C5 121.318 C1 C4 H10 115.974
C2 C5 C4 121.318 C2 C5 H11 115.974
C2 C6 C3 121.318 C2 C6 H12 115.974
C3 C1 C4 117.365 C3 C1 O7 121.318
C3 C6 H12 122.709 C4 C1 O7 121.318
C4 C5 H11 122.709 C5 C2 C6 117.365
C5 C2 O8 121.318 C5 C4 H10 122.709
C6 C2 O8 121.318 C6 C3 H9 122.709
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability