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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: MP2=FULL/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 MP2=FULL/6-31G
 hartrees
Energy at 0K-379.846793
Energy at 298.15K-379.850972
Nuclear repulsion energy317.398254
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 MP2=FULL/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 3222 3061 0.00      
2 Ag 1654 1571 0.00      
3 Ag 1519 1443 0.00      
4 Ag 1198 1138 0.00      
5 Ag 777 738 0.00      
6 Ag 455 433 0.00      
7 Au 921 875 0.00      
8 Au 328 311 0.00      
9 B1g 723 687 0.00      
10 B1u 3200 3041 1.45      
11 B1u 1577 1498 43.61      
12 B1u 1396 1326 5.95      
13 B1u 957 910 6.68      
14 B1u 756 718 0.15      
15 B2g 925 879 0.00      
16 B2g 616 585 0.00      
17 B2g 193 183 0.00      
18 B2u 3220 3059 9.99      
19 B2u 1609 1529 19.48      
20 B2u 1345 1278 56.80      
21 B2u 1100 1045 52.51      
22 B2u 397 378 25.24      
23 B3g 3200 3041 0.00      
24 B3g 1416 1346 0.00      
25 B3g 1272 1209 0.00      
26 B3g 610 579 0.00      
27 B3g 461 438 0.00      
28 B3u 838 796 96.39      
29 B3u 485 461 4.66      
30 B3u 91 87 14.06      

Unscaled Zero Point Vibrational Energy (zpe) 18229.3 cm-1
Scaled (by 0.9501) Zero Point Vibrational Energy (zpe) 17319.7 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 MP2=FULL/6-31G
ABC
0.17270 0.05316 0.04065

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.450
C2 0.000 0.000 -1.450
C3 0.000 1.276 0.682
C4 0.000 -1.276 0.682
C5 0.000 -1.276 -0.682
C6 0.000 1.276 -0.682
O7 0.000 0.000 2.727
O8 0.000 0.000 -2.727
H9 0.000 2.197 1.265
H10 0.000 -2.197 1.265
H11 0.000 -2.197 -1.265
H12 0.000 2.197 -1.265

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.90051.48931.48932.48502.48501.27654.17702.20522.20523.49283.4928
C22.90052.48502.48501.48931.48934.17701.27653.49283.49282.20522.2052
C31.48932.48502.55192.89381.36442.41003.63991.09023.52193.98182.1540
C41.48932.48502.55191.36442.89382.41003.63993.52191.09022.15403.9818
C52.48501.48932.89381.36442.55193.63992.41003.98182.15401.09023.5219
C62.48501.48931.36442.89382.55193.63992.41002.15403.98183.52191.0902
O71.27654.17702.41002.41003.63993.63995.45352.63932.63934.55644.5564
O84.17701.27653.63993.63992.41002.41005.45354.55644.55642.63932.6393
H92.20523.49281.09023.52193.98182.15402.63934.55644.39485.07082.5296
H102.20523.49283.52191.09022.15403.98182.63934.55644.39482.52965.0708
H113.49282.20523.98182.15401.09023.52194.55642.63935.07082.52964.3948
H123.49282.20522.15403.98183.52191.09024.55642.63932.52965.07084.3948

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.046 C1 C3 H9 116.649
C1 C4 C5 121.046 C1 C4 H10 116.649
C2 C5 C4 121.046 C2 C5 H11 116.649
C2 C6 C3 121.046 C2 C6 H12 116.649
C3 C1 C4 117.909 C3 C1 O7 121.046
C3 C6 H12 122.305 C4 C1 O7 121.046
C4 C5 H11 122.305 C5 C2 C6 117.909
C5 C2 O8 121.046 C5 C4 H10 122.305
C6 C2 O8 121.046 C6 C3 H9 122.305
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability