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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: CISD/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 CISD/6-31G
 hartrees
Energy at 0K-379.700633
Energy at 298.15K-379.705219
Nuclear repulsion energy321.073446
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 CISD/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 3316 3109 0.00      
2 Ag 1833 1719 0.00      
3 Ag 1727 1619 0.00      
4 Ag 1246 1169 0.00      
5 Ag 804 754 0.00      
6 Ag 476 446 0.00      
7 Au 1035 971 0.00      
8 Au 364 341 0.00      
9 B1g 782 734 0.00      
10 B1u 3292 3087 0.12      
11 B1u 1787 1676 305.50      
12 B1u 1461 1370 1.73      
13 B1u 997 935 12.90      
14 B1u 789 740 1.56      
15 B2g 1019 956 0.00      
16 B2g 736 690 0.00      
17 B2g 231 217 0.00      
18 B2u 3312 3106 6.36      
19 B2u 1751 1642 13.29      
20 B2u 1397 1310 67.69      
21 B2u 1145 1074 53.51      
22 B2u 424 397 34.65      
23 B3g 3292 3087 0.00      
24 B3g 1473 1382 0.00      
25 B3g 1318 1236 0.00      
26 B3g 639 599 0.00      
27 B3g 483 453 0.00      
28 B3u 910 853 120.21      
29 B3u 518 486 2.76      
30 B3u 94 88 18.47      

Unscaled Zero Point Vibrational Energy (zpe) 19324.9 cm-1
Scaled (by 0.9378) Zero Point Vibrational Energy (zpe) 18122.9 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 CISD/6-31G
ABC
0.17376 0.05478 0.04165

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.441
C2 0.000 0.000 -1.441
C3 0.000 1.273 0.671
C4 0.000 -1.273 0.671
C5 0.000 -1.273 -0.671
C6 0.000 1.273 -0.671
O7 0.000 0.000 2.681
O8 0.000 0.000 -2.681
H9 0.000 2.184 1.254
H10 0.000 -2.184 1.254
H11 0.000 -2.184 -1.254
H12 0.000 2.184 -1.254

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.88151.48771.48772.46572.46571.24064.12212.19212.19213.46883.4688
C22.88152.46572.46571.48771.48774.12211.24063.46883.46882.19212.1921
C31.48772.46572.54602.87801.34192.37963.58581.08183.50603.95702.1298
C41.48772.46572.54601.34192.87802.37963.58583.50601.08182.12983.9570
C52.46571.48772.87801.34192.54603.58582.37963.95702.12981.08183.5060
C62.46571.48771.34192.87802.54603.58582.37962.12983.95703.50601.0818
O71.24064.12212.37962.37963.58583.58585.36272.60912.60914.50094.5009
O84.12211.24063.58583.58582.37962.37965.36274.50094.50092.60912.6091
H92.19213.46881.08183.50603.95702.12982.60914.50094.36835.03722.5083
H102.19213.46883.50601.08182.12983.95702.60914.50094.36832.50835.0372
H113.46882.19213.95702.12981.08183.50604.50092.60915.03722.50834.3683
H123.46882.19212.12983.95703.50601.08184.50092.60912.50835.03724.3683

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.163 C1 C3 H9 116.214
C1 C4 C5 121.163 C1 C4 H10 116.214
C2 C5 C4 121.163 C2 C5 H11 116.214
C2 C6 C3 121.163 C2 C6 H12 116.214
C3 C1 C4 117.675 C3 C1 O7 121.163
C3 C6 H12 122.623 C4 C1 O7 121.163
C4 C5 H11 122.623 C5 C2 C6 117.675
C5 C2 O8 121.163 C5 C4 H10 122.623
C6 C2 O8 121.163 C6 C3 H9 122.623
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability