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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: CISD/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 CISD/6-311G*
 hartrees
Energy at 0K-380.243455
Energy at 298.15K-380.248075
Nuclear repulsion energy324.533587
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/6-311G*
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 3340 3090 0.00      
2 Ag 1929 1785 0.00      
3 Ag 1795 1661 0.00      
4 Ag 1228 1136 0.00      
5 Ag 807 747 0.00      
6 Ag 470 435 0.00      
7 Au 1060 981 0.00      
8 Au 354 327 0.00      
9 B1g 798 738 0.00      
10 B1u 3319 3071 1.85      
11 B1u 1913 1770 500.60      
12 B1u 1456 1347 5.21      
13 B1u 994 920 13.92      
14 B1u 790 731 0.15      
15 B2g 1050 972 0.00      
16 B2g 813 752 0.00      
17 B2g 217 200 0.00      
18 B2u 3337 3088 5.58      
19 B2u 1775 1642 14.17      
20 B2u 1398 1293 90.00      
21 B2u 1143 1058 49.93      
22 B2u 435 403 31.95      
23 B3g 3319 3071 0.00      
24 B3g 1485 1374 0.00      
25 B3g 1305 1207 0.00      
26 B3g 632 585 0.00      
27 B3g 470 435 0.00      
28 B3u 959 887 108.63      
29 B3u 538 498 3.67      
30 B3u 92 85 14.62      

Unscaled Zero Point Vibrational Energy (zpe) 19609.9 cm-1
Scaled (by 0.9253) Zero Point Vibrational Energy (zpe) 18145.0 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/6-311G*
ABC
0.17510 0.05620 0.04254

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

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 1.268 0.664
C4 0.000 -1.268 0.664
C5 0.000 -1.268 -0.664
C6 0.000 1.268 -0.664
O7 0.000 0.000 2.639
O8 0.000 0.000 -2.639
H9 0.000 2.176 1.246
H10 0.000 -2.176 1.246
H11 0.000 -2.176 -1.246
H12 0.000 2.176 -1.246

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.88011.48671.48672.45672.45671.19884.07902.18442.18443.45663.4566
C22.88012.45672.45671.48671.48674.07901.19883.45663.45662.18442.1844
C31.48672.45672.53622.86291.32812.34703.53801.07813.49263.93802.1146
C41.48672.45672.53621.32812.86292.34703.53803.49261.07812.11463.9380
C52.45671.48672.86291.32812.53623.53802.34703.93802.11461.07813.4926
C62.45671.48671.32812.86292.53623.53802.34702.11463.93803.49261.0781
O71.19884.07902.34702.34703.53803.53805.27782.58342.58344.45264.4526
O84.07901.19883.53803.53802.34702.34705.27784.45264.45262.58342.5834
H92.18443.45661.07813.49263.93802.11462.58344.45264.35145.01442.4918
H102.18443.45663.49261.07812.11463.93802.58344.45264.35142.49185.0144
H113.45662.18443.93802.11461.07813.49264.45262.58345.01442.49184.3514
H123.45662.18442.11463.93803.49261.07814.45262.58342.49185.01444.3514

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.465 C1 C3 H9 115.871
C1 C4 C5 121.465 C1 C4 H10 115.871
C2 C5 C4 121.465 C2 C5 H11 115.871
C2 C6 C3 121.465 C2 C6 H12 115.871
C3 C1 C4 117.071 C3 C1 O7 121.465
C3 C6 H12 122.664 C4 C1 O7 121.465
C4 C5 H11 122.664 C5 C2 C6 117.071
C5 C2 O8 121.465 C5 C4 H10 122.664
C6 C2 O8 121.465 C6 C3 H9 122.664
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability