return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: CCSD(T)/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 CCSD(T)/6-31G*
 hartrees
Energy at 0K-380.364772
Energy at 298.15K-380.368939
Nuclear repulsion energy320.571667
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 CCSD(T)/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 3211 3089        
2 Ag 1743 1677        
3 Ag 1662 1599        
4 Ag 1178 1133        
5 Ag 778 748        
6 Ag 450 433        
7 Au 938 902        
8 Au 309 297        
9 B1g 733 705        
10 B1u 3193 3072        
11 B1u 1735 1669        
12 B1u 1393 1340        
13 B1u 952 916        
14 B1u 755 727        
15 B2g 937 901        
16 B2g 676 650        
17 B2g 185 178        
18 B2u 3209 3087        
19 B2u 1647 1585        
20 B2u 1346 1295        
21 B2u 1095 1054        
22 B2u 408 392        
23 B3g 3193 3072        
24 B3g 1421 1367        
25 B3g 1255 1208        
26 B3g 602 579        
27 B3g 448 431        
28 B3u 861 828        
29 B3u 494 475        
30 B3u 91 88        

Unscaled Zero Point Vibrational Energy (zpe) 18447.0 cm-1
Scaled (by 0.9621) Zero Point Vibrational Energy (zpe) 17747.9 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 CCSD(T)/6-31G*
ABC
0.17333 0.05458 0.04151

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)/6-31G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.448
C2 0.000 0.000 -1.448
C3 0.000 1.274 0.676
C4 0.000 -1.274 0.676
C5 0.000 -1.274 -0.676
C6 0.000 1.274 -0.676
O7 0.000 0.000 2.682
O8 0.000 0.000 -2.682
H9 0.000 2.192 1.265
H10 0.000 -2.192 1.265
H11 0.000 -2.192 -1.265
H12 0.000 2.192 -1.265

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.89671.48971.48972.47702.47701.23364.13032.19922.19923.48803.4880
C22.89672.47702.47701.48971.48974.13031.23363.48803.48802.19922.1992
C31.48972.47702.54782.88431.35212.37623.59151.09053.51523.97212.1472
C41.48972.47702.54781.35212.88432.37623.59153.51521.09052.14723.9721
C52.47701.48972.88431.35212.54783.59152.37623.97212.14721.09053.5152
C62.47701.48971.35212.88432.54783.59152.37622.14723.97213.51521.0905
O71.23364.13032.37622.37623.59153.59155.36402.60972.60974.51484.5148
O84.13031.23363.59153.59152.37622.37625.36404.51484.51482.60972.6097
H92.19923.48801.09053.51523.97212.14722.60974.51484.38325.06112.5304
H102.19923.48803.51521.09052.14723.97212.60974.51484.38322.53045.0611
H113.48802.19923.97212.14721.09053.51524.51482.60975.06112.53044.3832
H123.48802.19922.14723.97213.51521.09054.51482.60972.53045.06114.3832

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 116.074
C1 C4 C5 121.227 C1 C4 H10 116.074
C2 C5 C4 121.227 C2 C5 H11 116.074
C2 C6 C3 121.227 C2 C6 H12 116.074
C3 C1 C4 117.547 C3 C1 O7 121.227
C3 C6 H12 122.699 C4 C1 O7 121.227
C4 C5 H11 122.699 C5 C2 C6 117.547
C5 C2 O8 121.227 C5 C4 H10 122.699
C6 C2 O8 121.227 C6 C3 H9 122.699
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability