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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: MP2/6-311G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at MP2/6-311G*
 hartrees
Energy at 0K-380.474331
Energy at 298.15K-380.478546
HF Energy-379.309342
Nuclear repulsion energy321.549001
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 MP2/6-311G*
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 3234 3073 0.00      
2 Ag 1708 1623 0.00      
3 Ag 1646 1564 0.00      
4 Ag 1173 1114 0.00      
5 Ag 782 743 0.00      
6 Ag 449 427 0.00      
7 Au 957 909 0.00      
8 Au 316 301 0.00      
9 B1g 744 707 0.00      
10 B1u 3215 3055 0.96      
11 B1u 1709 1624 160.62      
12 B1u 1387 1318 7.11      
13 B1u 948 901 11.95      
14 B1u 758 721 0.12      
15 B2g 954 907 0.00      
16 B2g 712 677 0.00      
17 B2g 169 160 0.00      
18 B2u 3232 3072 5.05      
19 B2u 1632 1551 21.55      
20 B2u 1341 1274 71.50      
21 B2u 1092 1038 51.50      
22 B2u 408 388 24.05      
23 B3g 3216 3056 0.00      
24 B3g 1418 1348 0.00      
25 B3g 1253 1190 0.00      
26 B3g 603 573 0.00      
27 B3g 444 422 0.00      
28 B3u 889 844 91.13      
29 B3u 498 473 6.66      
30 B3u 87 83 10.91      

Unscaled Zero Point Vibrational Energy (zpe) 18486.6 cm-1
Scaled (by 0.9503) Zero Point Vibrational Energy (zpe) 17567.8 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 MP2/6-311G*
ABC
0.17491 0.05480 0.04173

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-311G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.459
C2 0.000 0.000 -1.459
C3 0.000 1.270 0.674
C4 0.000 -1.270 0.674
C5 0.000 -1.270 -0.674
C6 0.000 1.270 -0.674
O7 0.000 0.000 2.679
O8 0.000 0.000 -2.679
H9 0.000 2.185 1.263
H10 0.000 -2.185 1.263
H11 0.000 -2.185 -1.263
H12 0.000 2.185 -1.263

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.91861.49271.49272.48302.48301.21934.13792.19352.19353.49033.4903
C22.91862.48302.48301.49271.49274.13791.21933.49033.49032.19352.1935
C31.49272.48302.53962.87561.34902.37253.58551.08773.50423.96062.1424
C41.49272.48302.53961.34902.87562.37253.58553.50421.08772.14243.9606
C52.48301.49272.87561.34902.53963.58552.37253.96062.14241.08773.5042
C62.48301.49271.34902.87562.53963.58552.37252.14243.96063.50421.0877
O71.21934.13792.37252.37253.58553.58555.35722.60342.60344.50634.5063
O84.13791.21933.58553.58552.37252.37255.35724.50634.50632.60342.6034
H92.19353.49031.08773.50423.96062.14242.60344.50634.36945.04672.5254
H102.19353.49033.50421.08772.14243.96062.60344.50634.36942.52545.0467
H113.49032.19353.96062.14241.08773.50424.50632.60345.04672.52544.3694
H123.49032.19352.14243.96063.50421.08774.50632.60342.52545.04674.3694

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.719 C1 C3 H9 115.544
C1 C4 C5 121.719 C1 C4 H10 115.544
C2 C5 C4 121.719 C2 C5 H11 115.544
C2 C6 C3 121.719 C2 C6 H12 115.544
C3 C1 C4 116.563 C3 C1 O7 121.719
C3 C6 H12 122.737 C4 C1 O7 121.719
C4 C5 H11 122.737 C5 C2 C6 116.563
C5 C2 O8 121.719 C5 C4 H10 122.737
C6 C2 O8 121.719 C6 C3 H9 122.737
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability