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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: CCD/6-31+G**

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/6-31+G**
 hartrees
Energy at 0K-380.400618
Energy at 298.15K-380.404695
Nuclear repulsion energy321.768839
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/6-31+G**
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 3286 3096 0.00      
2 Ag 1819 1714 0.00      
3 Ag 1717 1618 0.00      
4 Ag 1196 1127 0.00      
5 Ag 790 744 0.00      
6 Ag 457 431 0.00      
7 Au 964 908 0.00      
8 Au 308 290 0.00      
9 B1g 736 694 0.00      
10 B1u 3267 3078 0.53      
11 B1u 1807 1703 309.88      
12 B1u 1420 1338 2.70      
13 B1u 965 909 9.65      
14 B1u 770 726 0.02      
15 B2g 956 901 0.00      
16 B2g 606 571 0.00      
17 B2g 100 94 0.00      
18 B2u 3284 3094 4.59      
19 B2u 1704 1606 12.37      
20 B2u 1364 1285 79.28      
21 B2u 1113 1049 35.96      
22 B2u 418 394 27.55      
23 B3g 3267 3078 0.00      
24 B3g 1450 1366 0.00      
25 B3g 1280 1206 0.00      
26 B3g 613 578 0.00      
27 B3g 461 434 0.00      
28 B3u 865 815 92.78      
29 B3u 498 469 3.30      
30 B3u 80 75 14.77      

Unscaled Zero Point Vibrational Energy (zpe) 18777.6 cm-1
Scaled (by 0.9423) Zero Point Vibrational Energy (zpe) 17694.2 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/6-31+G**
ABC
0.17357 0.05511 0.04183

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.444
C2 0.000 0.000 -1.444
C3 0.000 1.274 0.672
C4 0.000 -1.274 0.672
C5 0.000 -1.274 -0.672
C6 0.000 1.274 -0.672
O7 0.000 0.000 2.669
O8 0.000 0.000 -2.669
H9 0.000 2.185 1.255
H10 0.000 -2.185 1.255
H11 0.000 -2.185 -1.255
H12 0.000 2.185 -1.255

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.88791.48931.48932.46972.46971.22464.11252.19352.19353.47303.4730
C22.88792.46972.46971.48931.48934.11251.22463.47303.47302.19352.1935
C31.48932.46972.54742.88021.34412.36823.57521.08233.50793.95972.1321
C41.48932.46972.54741.34412.88022.36823.57523.50791.08232.13213.9597
C52.46971.48932.88021.34412.54743.57522.36823.95972.13211.08233.5079
C62.46971.48931.34412.88022.54743.57522.36822.13213.95973.50791.0823
O71.22464.11252.36822.36823.57523.57525.33712.60252.60254.49134.4913
O84.11251.22463.57523.57522.36822.36825.33714.49134.49132.60252.6025
H92.19353.47301.08233.50793.95972.13212.60254.49134.37075.04042.5105
H102.19353.47303.50791.08232.13213.95972.60254.49134.37072.51055.0404
H113.47302.19353.95972.13211.08233.50794.49132.60255.04042.51054.3707
H123.47302.19352.13213.95973.50791.08234.49132.60252.51055.04044.3707

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.217 C1 C3 H9 116.174
C1 C4 C5 121.217 C1 C4 H10 116.174
C2 C5 C4 121.217 C2 C5 H11 116.174
C2 C6 C3 121.217 C2 C6 H12 116.174
C3 C1 C4 117.565 C3 C1 O7 121.217
C3 C6 H12 122.608 C4 C1 O7 121.217
C4 C5 H11 122.608 C5 C2 C6 117.565
C5 C2 O8 121.217 C5 C4 H10 122.608
C6 C2 O8 121.217 C6 C3 H9 122.608
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability