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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: CBS-Q

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at CBS-Q
 hartrees
Energy at 0K-380.873712
Energy at 298.15K-380.879028
Nuclear repulsion energy324.925740
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 CBS-Q
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 3394 3394 0.00      
2 Ag 2016 2016 0.00      
3 Ag 1857 1857 0.00      
4 Ag 1259 1259 0.00      
5 Ag 819 819 0.00      
6 Ag 481 481 0.00      
7 Au 1127 1127 0.00      
8 Au 376 376 0.00      
9 B1g 833 833 0.00      
10 B1u 3373 3373 2.49      
11 B1u 1996 1996 712.26      
12 B1u 1497 1497 4.81      
13 B1u 1023 1023 15.71      
14 B1u 806 806 0.42      
15 B2g 1129 1129 0.00      
16 B2g 875 875 0.00      
17 B2g 256 256 0.00      
18 B2u 3392 3392 6.17      
19 B2u 1835 1835 10.94      
20 B2u 1431 1431 109.27      
21 B2u 1172 1172 44.19      
22 B2u 450 450 37.02      
23 B3g 3373 3373 0.00      
24 B3g 1525 1525 0.00      
25 B3g 1334 1334 0.00      
26 B3g 646 646 0.00      
27 B3g 485 485 0.00      
28 B3u 997 997 110.62      
29 B3u 563 563 0.75      
30 B3u 98 98 17.78      

Unscaled Zero Point Vibrational Energy (zpe) 20207.6 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 20207.6 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 CBS-Q
ABC
0.17465 0.05462 0.04161

See section I.F.4 to change rotational constant units
Geometric Data calculated at CBS-Q

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 1.272 0.662
C4 0.000 -1.272 0.662
C5 0.000 -1.272 -0.662
C6 0.000 1.272 -0.662
O7 0.000 0.000 2.630
O8 0.000 0.000 -2.630
H9 0.000 2.177 1.246
H10 0.000 -2.177 1.246
H11 0.000 -2.177 -1.246
H12 0.000 2.177 -1.246

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.88021.49091.49092.45732.45731.18974.06992.18612.18613.45763.4576
C22.88022.45732.45731.49091.49094.06991.18973.45763.45762.18612.1861
C31.49092.45732.54402.86821.32462.34283.52931.07713.49843.94202.1120
C41.49092.45732.54401.32462.86822.34283.52933.49841.07712.11203.9420
C52.45731.49092.86821.32462.54403.52932.34283.94202.11201.07713.4984
C62.45731.49091.32462.86822.54403.52932.34282.11203.94203.49841.0771
O71.18974.06992.34282.34283.52933.52935.25962.58012.58014.44544.4454
O84.06991.18973.52933.52932.34282.34285.25964.44544.44542.58012.5801
H92.18613.45761.07713.49843.94202.11202.58014.44544.35495.01722.4915
H102.18613.45763.49841.07712.11203.94202.58014.44544.35492.49155.0172
H113.45762.18613.94202.11201.07713.49844.44542.58015.01722.49154.3549
H123.45762.18612.11203.94203.49841.07714.44542.58012.49155.01724.3549

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.444 C1 C3 H9 115.758
C1 C4 C5 121.444 C1 C4 H10 115.758
C2 C5 C4 121.444 C2 C5 H11 115.758
C2 C6 C3 121.444 C2 C6 H12 115.758
C3 C1 C4 117.111 C3 C1 O7 121.444
C3 C6 H12 122.797 C4 C1 O7 121.444
C4 C5 H11 122.797 C5 C2 C6 117.111
C5 C2 O8 121.444 C5 C4 H10 122.797
C6 C2 O8 121.444 C6 C3 H9 122.797
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability