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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: CCD/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 CCD/6-31G**
 hartrees
Energy at 0K-380.378758
Energy at 298.15K-380.383086
Nuclear repulsion energy322.036830
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 CCD/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 3291 3086 0.00      
2 Ag 1840 1725 0.00      
3 Ag 1730 1622 0.00      
4 Ag 1195 1120 0.00      
5 Ag 791 742 0.00      
6 Ag 457 429 0.00      
7 Au 988 926 0.00      
8 Au 324 304 0.00      
9 B1g 753 706 0.00      
10 B1u 3272 3068 1.01      
11 B1u 1831 1717 223.09      
12 B1u 1421 1333 4.88      
13 B1u 965 905 8.88      
14 B1u 771 723 0.07      
15 B2g 980 919 0.00      
16 B2g 699 656 0.00      
17 B2g 191 179 0.00      
18 B2u 3289 3084 6.50      
19 B2u 1714 1608 12.26      
20 B2u 1368 1282 85.37      
21 B2u 1114 1045 37.26      
22 B2u 418 392 28.28      
23 B3g 3272 3068 0.00      
24 B3g 1455 1364 0.00      
25 B3g 1279 1199 0.00      
26 B3g 615 576 0.00      
27 B3g 459 430 0.00      
28 B3u 885 830 85.28      
29 B3u 506 474 1.44      
30 B3u 88 83 13.16      

Unscaled Zero Point Vibrational Energy (zpe) 18980.2 cm-1
Scaled (by 0.9376) Zero Point Vibrational Energy (zpe) 17795.9 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 CCD/6-31G**
ABC
0.17404 0.05515 0.04188

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.445
C2 0.000 0.000 -1.445
C3 0.000 1.272 0.671
C4 0.000 -1.272 0.671
C5 0.000 -1.272 -0.671
C6 0.000 1.272 -0.671
O7 0.000 0.000 2.667
O8 0.000 0.000 -2.667
H9 0.000 2.183 1.255
H10 0.000 -2.183 1.255
H11 0.000 -2.183 -1.255
H12 0.000 2.183 -1.255

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.89011.48901.48902.46892.46891.22224.11232.19112.19113.47173.4717
C22.89012.46892.46891.48901.48904.11231.22223.47173.47172.19112.1911
C31.48902.46892.54392.87611.34192.36713.57231.08183.50363.95512.1301
C41.48902.46892.54391.34192.87612.36713.57233.50361.08182.13013.9551
C52.46891.48902.87611.34192.54393.57232.36713.95512.13011.08183.5036
C62.46891.48901.34192.87612.54393.57232.36712.13013.95513.50361.0818
O71.22224.11232.36712.36713.57233.57235.33452.60002.60004.48844.4884
O84.11231.22223.57233.57232.36712.36715.33454.48844.48842.60002.6000
H92.19113.47171.08183.50363.95512.13012.60004.48844.36555.03532.5092
H102.19113.47173.50361.08182.13013.95512.60004.48844.36552.50925.0353
H113.47172.19113.95512.13011.08183.50364.48842.60005.03532.50924.3655
H123.47172.19112.13013.95513.50361.08184.48842.60002.50925.03534.3655

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.325 C1 C3 H9 116.025
C1 C4 C5 121.325 C1 C4 H10 116.025
C2 C5 C4 121.325 C2 C5 H11 116.025
C2 C6 C3 121.325 C2 C6 H12 116.025
C3 C1 C4 117.350 C3 C1 O7 121.325
C3 C6 H12 122.650 C4 C1 O7 121.325
C4 C5 H11 122.650 C5 C2 C6 117.350
C5 C2 O8 121.325 C5 C4 H10 122.650
C6 C2 O8 121.325 C6 C3 H9 122.650
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability