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: MP2/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at MP2/6-31G(2df,p)
 hartrees
Energy at 0K-380.574019
Energy at 298.15K-380.578405
Nuclear repulsion energy322.546072
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 MP2/6-31G(2df,p)
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 3256 3076 0.00      
2 Ag 1709 1614 0.00      
3 Ag 1654 1562 0.00      
4 Ag 1161 1097 0.00      
5 Ag 786 743 0.00      
6 Ag 444 419 0.00      
7 Au 1003 947 0.00      
8 Au 329 311 0.00      
9 B1g 768 725 0.00      
10 B1u 3237 3057 0.00      
11 B1u 1715 1620 155.55      
12 B1u 1377 1301 9.31      
13 B1u 941 889 10.59      
14 B1u 757 715 0.28      
15 B2g 1016 960 0.00      
16 B2g 790 746 0.00      
17 B2g 225 213 0.00      
18 B2u 3255 3074 1.05      
19 B2u 1635 1544 22.74      
20 B2u 1341 1267 71.82      
21 B2u 1080 1020 40.23      
22 B2u 409 386 23.67      
23 B3g 3238 3058 0.00      
24 B3g 1407 1329 0.00      
25 B3g 1236 1167 0.00      
26 B3g 601 568 0.00      
27 B3g 437 413 0.00      
28 B3u 909 858 65.77      
29 B3u 514 485 2.91      
30 B3u 91 86 11.41      

Unscaled Zero Point Vibrational Energy (zpe) 18659.6 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 17624.0 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 MP2/6-31G(2df,p)
ABC
0.17606 0.05515 0.04200

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.442
C2 0.000 0.000 -1.442
C3 0.000 1.264 0.673
C4 0.000 -1.264 0.673
C5 0.000 -1.264 -0.673
C6 0.000 1.264 -0.673
O7 0.000 0.000 2.668
O8 0.000 0.000 -2.668
H9 0.000 2.177 1.257
H10 0.000 -2.177 1.257
H11 0.000 -2.177 -1.257
H12 0.000 2.177 -1.257

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.88351.47931.47932.46322.46321.22614.10952.18462.18463.46753.4675
C22.88352.46322.46321.47931.47934.10951.22613.46753.46752.18462.1846
C31.47932.46322.52732.86301.34522.36173.57141.08433.48983.94482.1351
C41.47932.46322.52731.34522.86302.36173.57143.48981.08432.13513.9448
C52.46321.47932.86301.34522.52733.57142.36173.94482.13511.08433.4898
C62.46321.47931.34522.86302.52733.57142.36172.13513.94483.48981.0843
O71.22614.10952.36172.36173.57143.57145.33562.59382.59384.48844.4884
O84.10951.22613.57143.57142.36172.36175.33564.48844.48842.59382.5938
H92.18463.46751.08433.48983.94482.13512.59384.48844.35355.02772.5148
H102.18463.46753.48981.08432.13513.94482.59384.48844.35352.51485.0277
H113.46752.18463.94482.13511.08433.48984.48842.59385.02772.51484.3535
H123.46752.18462.13513.94483.48981.08434.48842.59382.51485.02774.3535

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.327 C1 C3 H9 116.036
C1 C4 C5 121.327 C1 C4 H10 116.036
C2 C5 C4 121.327 C2 C5 H11 116.036
C2 C6 C3 121.327 C2 C6 H12 116.036
C3 C1 C4 117.346 C3 C1 O7 121.327
C3 C6 H12 122.636 C4 C1 O7 121.327
C4 C5 H11 122.636 C5 C2 C6 117.346
C5 C2 O8 121.327 C5 C4 H10 122.636
C6 C2 O8 121.327 C6 C3 H9 122.636
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability