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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-380.392373
Energy at 298.15K-380.396637
Nuclear repulsion energy321.961172
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 3292 3076 0.00      
2 Ag 1727 1614 0.00      
3 Ag 1663 1554 0.00      
4 Ag 1184 1106 0.00      
5 Ag 795 743 0.00      
6 Ag 453 424 0.00      
7 Au 979 915 0.00      
8 Au 316 296 0.00      
9 B1g 755 706 0.00      
10 B1u 3274 3059 0.41      
11 B1u 1720 1607 134.61      
12 B1u 1408 1315 7.63      
13 B1u 959 896 10.69      
14 B1u 766 715 0.18      
15 B2g 977 913 0.00      
16 B2g 682 638 0.00      
17 B2g 181 169 0.00      
18 B2u 3291 3075 3.96      
19 B2u 1659 1550 19.94      
20 B2u 1362 1273 80.32      
21 B2u 1106 1033 39.87      
22 B2u 410 383 25.37      
23 B3g 3274 3060 0.00      
24 B3g 1443 1348 0.00      
25 B3g 1269 1185 0.00      
26 B3g 608 569 0.00      
27 B3g 449 420 0.00      
28 B3u 885 827 81.01      
29 B3u 505 472 2.13      
30 B3u 90 84 12.11      

Unscaled Zero Point Vibrational Energy (zpe) 18741.2 cm-1
Scaled (by 0.9344) Zero Point Vibrational Energy (zpe) 17511.8 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=FULL/6-31G**
ABC
0.17589 0.05490 0.04184

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 1.440
C2 0.000 0.000 -1.440
C3 0.000 1.264 0.674
C4 0.000 -1.264 0.674
C5 0.000 -1.264 -0.674
C6 0.000 1.264 -0.674
O7 0.000 0.000 2.676
O8 0.000 0.000 -2.676
H9 0.000 2.177 1.254
H10 0.000 -2.177 1.254
H11 0.000 -2.177 -1.254
H12 0.000 2.177 -1.254

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.88041.47861.47862.46312.46311.23624.11652.18462.18463.46393.4639
C22.88042.46312.46311.47861.47864.11651.23623.46393.46392.18462.1846
C31.47862.46312.52882.86531.34722.36853.58061.08143.48983.94442.1329
C41.47862.46312.52881.34722.86532.36853.58063.48981.08142.13293.9444
C52.46311.47862.86531.34722.52883.58062.36853.94442.13291.08143.4898
C62.46311.47861.34722.86532.52883.58062.36852.13293.94443.48981.0814
O71.23624.11652.36852.36853.58063.58065.35272.60002.60004.49324.4932
O84.11651.23623.58063.58062.36852.36855.35274.49324.49322.60002.6000
H92.18463.46391.08143.48983.94442.13292.60004.49324.35345.02452.5088
H102.18463.46393.48981.08142.13293.94442.60004.49324.35342.50885.0245
H113.46392.18463.94442.13291.08143.48984.49322.60005.02452.50884.3534
H123.46392.18462.13293.94443.48981.08144.49322.60002.50885.02454.3534

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.227 C1 C3 H9 116.292
C1 C4 C5 121.227 C1 C4 H10 116.292
C2 C5 C4 121.227 C2 C5 H11 116.292
C2 C6 C3 121.227 C2 C6 H12 116.292
C3 C1 C4 117.547 C3 C1 O7 121.227
C3 C6 H12 122.481 C4 C1 O7 121.227
C4 C5 H11 122.481 C5 C2 C6 117.547
C5 C2 O8 121.227 C5 C4 H10 122.481
C6 C2 O8 121.227 C6 C3 H9 122.481
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability