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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: QCISD/cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at QCISD/cc-pVDZ
 hartrees
Energy at 0K-380.422250
Energy at 298.15K-380.426645
Nuclear repulsion energy319.941593
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 QCISD/cc-pVDZ
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 3236 3104 0.00      
2 Ag 1800 1727 0.00      
3 Ag 1693 1624 0.00      
4 Ag 1156 1109 0.00      
5 Ag 778 746 0.00      
6 Ag 447 429 0.00      
7 Au 1008 968 0.00      
8 Au 332 319 0.00      
9 B1g 764 733 0.00      
10 B1u 3215 3084 1.81      
11 B1u 1780 1708 324.69      
12 B1u 1378 1322 4.02      
13 B1u 943 905 11.32      
14 B1u 755 725 0.01      
15 B2g 1005 964 0.00      
16 B2g 778 747 0.00      
17 B2g 218 209 0.00      
18 B2u 3234 3102 6.28      
19 B2u 1683 1615 14.42      
20 B2u 1334 1280 80.29      
21 B2u 1079 1035 41.40      
22 B2u 410 393 24.25      
23 B3g 3215 3084 0.00      
24 B3g 1418 1361 0.00      
25 B3g 1236 1186 0.00      
26 B3g 601 576 0.00      
27 B3g 446 428 0.00      
28 B3u 907 871 76.35      
29 B3u 512 491 2.72      
30 B3u 90 86 10.94      

Unscaled Zero Point Vibrational Energy (zpe) 18724.1 cm-1
Scaled (by 0.9594) Zero Point Vibrational Energy (zpe) 17963.9 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 QCISD/cc-pVDZ
ABC
0.17219 0.05434 0.04131

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/cc-pVDZ

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.461
C2 0.000 0.000 -1.461
C3 0.000 1.278 0.676
C4 0.000 -1.278 0.676
C5 0.000 -1.278 -0.676
C6 0.000 1.278 -0.676
O7 0.000 0.000 2.685
O8 0.000 0.000 -2.685
H9 0.000 2.202 1.266
H10 0.000 -2.202 1.266
H11 0.000 -2.202 -1.266
H12 0.000 2.202 -1.266

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.92251.49951.49952.49042.49041.22334.14582.21022.21023.50503.5050
C22.92252.49042.49041.49951.49954.14581.22333.50503.50502.21022.2102
C31.49952.49042.55542.89151.35292.38013.59571.09603.52893.98482.1510
C41.49952.49042.55541.35292.89152.38013.59573.52891.09602.15103.9848
C52.49041.49952.89151.35292.55543.59572.38013.98482.15101.09603.5289
C62.49041.49951.35292.89152.55543.59572.38012.15103.98483.52891.0960
O71.22334.14582.38012.38013.59573.59575.36912.61902.61904.52264.5226
O84.14581.22333.59573.59572.38012.38015.36914.52264.52262.61902.6190
H92.21023.50501.09603.52893.98482.15102.61904.52264.40325.07932.5320
H102.21023.50503.52891.09602.15103.98482.61904.52264.40322.53205.0793
H113.50502.21023.98482.15101.09603.52894.52262.61905.07932.53204.4032
H123.50502.21022.15103.98483.52891.09604.52262.61902.53205.07934.4032

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.559 C1 C3 H9 115.899
C1 C4 C5 121.559 C1 C4 H10 115.899
C2 C5 C4 121.559 C2 C5 H11 115.899
C2 C6 C3 121.559 C2 C6 H12 115.899
C3 C1 C4 116.883 C3 C1 O7 121.559
C3 C6 H12 122.542 C4 C1 O7 121.559
C4 C5 H11 122.542 C5 C2 C6 116.883
C5 C2 O8 121.559 C5 C4 H10 122.542
C6 C2 O8 121.559 C6 C3 H9 122.542
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability