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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: G2

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at G2
 hartrees
Energy at 0K-380.850762
Energy at 298.15K-380.856090
Nuclear repulsion energy325.000508
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 HF/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 3410 3213 0.00      
2 Ag 2020 1903 0.00      
3 Ag 1857 1750 0.00      
4 Ag 1270 1196 0.00      
5 Ag 822 775 0.00      
6 Ag 483 455 0.00      
7 Au 1136 1070 0.00      
8 Au 379 357 0.00      
9 B1g 837 789 0.00      
10 B1u 3390 3194 2.25      
11 B1u 2001 1885 656.20      
12 B1u 1511 1423 4.83      
13 B1u 1028 969 16.48      
14 B1u 808 761 0.42      
15 B2g 1133 1067 0.00      
16 B2g 863 813 0.00      
17 B2g 255 241 0.00      
18 B2u 3408 3211 5.65      
19 B2u 1835 1729 9.94      
20 B2u 1438 1355 106.01      
21 B2u 1181 1113 45.83      
22 B2u 449 423 38.04      
23 B3g 3390 3194 0.00      
24 B3g 1535 1446 0.00      
25 B3g 1342 1265 0.00      
26 B3g 648 610 0.00      
27 B3g 489 461 0.00      
28 B3u 995 938 122.44      
29 B3u 562 529 0.59      
30 B3u 98 93 18.17      

Unscaled Zero Point Vibrational Energy (zpe) 20286.0 cm-1
Scaled (by 0.9422) Zero Point Vibrational Energy (zpe) 19113.4 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
0.17565 0.05490 0.04183

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 1.265 0.674
C4 0.000 -1.265 0.674
C5 0.000 -1.265 -0.674
C6 0.000 1.265 -0.674
O7 0.000 0.000 2.676
O8 0.000 0.000 -2.676
H9 0.000 2.181 1.258
H10 0.000 -2.181 1.258
H11 0.000 -2.181 -1.258
H12 0.000 2.181 -1.258

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.87971.47881.47882.46322.46321.23644.11622.18872.18873.46933.4693
C22.87972.46322.46321.47881.47884.11621.23643.46933.46932.18872.1887
C31.47882.46322.52982.86631.34762.36853.58091.08673.49523.95062.1382
C41.47882.46322.52981.34762.86632.36853.58093.49521.08672.13823.9506
C52.46321.47882.86631.34762.52983.58092.36853.95062.13821.08673.4952
C62.46321.47881.34762.86632.52983.58092.36852.13823.95063.49521.0867
O71.23644.11622.36852.36853.58093.58095.35262.60172.60174.49854.4985
O84.11621.23643.58093.58092.36852.36855.35264.49854.49852.60172.6017
H92.18873.46931.08673.49523.95062.13822.60174.49854.36235.03602.5161
H102.18873.46933.49521.08672.13823.95062.60174.49854.36232.51615.0360
H113.46932.18873.95062.13821.08673.49524.49852.60175.03602.51614.3623
H123.46932.18872.13823.95063.49521.08674.49852.60172.51615.03604.3623

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.401 C1 C3 H9 115.844
C1 C4 C5 121.401 C1 C4 H10 115.844
C2 C5 C4 121.401 C2 C5 H11 115.844
C2 C6 C3 121.401 C2 C6 H12 115.844
C3 C1 C4 117.198 C3 C1 O7 121.401
C3 C6 H12 122.755 C4 C1 O7 121.401
C4 C5 H11 122.755 C5 C2 C6 117.198
C5 C2 O8 121.401 C5 C4 H10 122.755
C6 C2 O8 121.401 C6 C3 H9 122.755
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability