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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-380.395891
Energy at 298.15K-380.400165
Nuclear repulsion energy321.421972
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 3280 3088 0.00      
2 Ag 1807 1701 0.00      
3 Ag 1705 1605 0.00      
4 Ag 1190 1120 0.00      
5 Ag 784 738 0.00      
6 Ag 454 427 0.00      
7 Au 984 926 0.00      
8 Au 319 300 0.00      
9 B1g 752 708 0.00      
10 B1u 3261 3070 1.55      
11 B1u 1783 1678 307.23      
12 B1u 1413 1330 3.52      
13 B1u 960 904 11.46      
14 B1u 763 718 0.00      
15 B2g 977 919 0.00      
16 B2g 696 655 0.00      
17 B2g 184 173 0.00      
18 B2u 3278 3086 7.28      
19 B2u 1697 1598 12.65      
20 B2u 1359 1279 82.55      
21 B2u 1107 1042 39.70      
22 B2u 413 389 27.34      
23 B3g 3261 3070 0.00      
24 B3g 1441 1357 0.00      
25 B3g 1267 1193 0.00      
26 B3g 607 572 0.00      
27 B3g 453 426 0.00      
28 B3u 883 831 86.08      
29 B3u 503 473 1.19      
30 B3u 86 81 13.17      

Unscaled Zero Point Vibrational Energy (zpe) 18832.8 cm-1
Scaled (by 0.9414) Zero Point Vibrational Energy (zpe) 17729.2 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
0.17371 0.05489 0.04171

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 1.273 0.672
C4 0.000 -1.273 0.672
C5 0.000 -1.273 -0.672
C6 0.000 1.273 -0.672
O7 0.000 0.000 2.674
O8 0.000 0.000 -2.674
H9 0.000 2.184 1.257
H10 0.000 -2.184 1.257
H11 0.000 -2.184 -1.257
H12 0.000 2.184 -1.257

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.89461.49061.49062.47252.47251.22704.12162.19252.19253.47603.4760
C22.89462.47252.47251.49061.49064.12161.22703.47603.47602.19252.1925
C31.49062.47252.54652.87951.34442.37273.58051.08243.50653.95912.1332
C41.49062.47252.54651.34442.87952.37273.58053.50651.08242.13323.9591
C52.47251.49062.87951.34442.54653.58052.37273.95912.13321.08243.5065
C62.47251.49061.34442.87952.54653.58052.37272.13323.95913.50651.0824
O71.22704.12162.37272.37273.58053.58055.34852.60392.60394.49704.4970
O84.12161.22703.58053.58052.37272.37275.34854.49704.49702.60392.6039
H92.19253.47601.08243.50653.95912.13322.60394.49704.36855.03992.5134
H102.19253.47603.50651.08242.13323.95912.60394.49704.36852.51345.0399
H113.47602.19253.95912.13321.08243.50654.49702.60395.03992.51344.3685
H123.47602.19252.13323.95913.50651.08244.49702.60392.51345.03994.3685

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.332 C1 C3 H9 115.982
C1 C4 C5 121.332 C1 C4 H10 115.982
C2 C5 C4 121.332 C2 C5 H11 115.982
C2 C6 C3 121.332 C2 C6 H12 115.982
C3 C1 C4 117.336 C3 C1 O7 121.332
C3 C6 H12 122.686 C4 C1 O7 121.332
C4 C5 H11 122.686 C5 C2 C6 117.336
C5 C2 O8 121.332 C5 C4 H10 122.686
C6 C2 O8 121.332 C6 C3 H9 122.686
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability