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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: MP2/CEP-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 MP2/CEP-31G
 hartrees
Energy at 0K-67.108470
Energy at 298.15K-67.112609
Nuclear repulsion energy156.731961
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/CEP-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 3206 3098 0.00      
2 Ag 1621 1567 0.00      
3 Ag 1456 1407 0.00      
4 Ag 1170 1131 0.00      
5 Ag 760 734 0.00      
6 Ag 434 419 0.00      
7 Au 930 899 0.00      
8 Au 343 331 0.00      
9 B1g 743 718 0.00      
10 B1u 3168 3061 2.09      
11 B1u 1524 1473 57.28      
12 B1u 1356 1310 4.40      
13 B1u 931 899 5.16      
14 B1u 737 712 0.01      
15 B2g 922 891 0.00      
16 B2g 656 634 0.00      
17 B2g 212 205 0.00      
18 B2u 3204 3096 27.95      
19 B2u 1579 1526 26.11      
20 B2u 1330 1285 57.63      
21 B2u 1076 1040 47.38      
22 B2u 381 368 26.57      
23 B3g 3170 3064 0.00      
24 B3g 1401 1353 0.00      
25 B3g 1260 1217 0.00      
26 B3g 588 568 0.00      
27 B3g 437 422 0.00      
28 B3u 865 836 101.82      
29 B3u 475 459 7.13      
30 B3u 91 88 15.54      

Unscaled Zero Point Vibrational Energy (zpe) 18011.3 cm-1
Scaled (by 0.9663) Zero Point Vibrational Energy (zpe) 17404.3 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/CEP-31G
ABC
0.16626 0.05116 0.03912

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.480
C2 0.000 0.000 -1.480
C3 0.000 1.301 0.699
C4 0.000 -1.301 0.699
C5 0.000 -1.301 -0.699
C6 0.000 1.301 -0.699
O7 0.000 0.000 2.778
O8 0.000 0.000 -2.778
H9 0.000 2.233 1.283
H10 0.000 -2.233 1.283
H11 0.000 -2.233 -1.283
H12 0.000 2.233 -1.283

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.96031.51791.51792.53782.53781.29784.25812.24212.24213.55283.5528
C22.96032.53782.53781.51791.51794.25811.29783.55283.55282.24212.2421
C31.51792.53782.60262.95401.39732.45293.71211.10013.58274.05232.1898
C41.51792.53782.60261.39732.95402.45293.71213.58271.10012.18984.0523
C52.53781.51792.95401.39732.60263.71212.45294.05232.18981.10013.5827
C62.53781.51791.39732.95402.60263.71212.45292.18984.05233.58271.1001
O71.29784.25812.45292.45293.71213.71215.55582.68762.68764.63454.6345
O84.25811.29783.71213.71212.45292.45295.55584.63454.63452.68762.6876
H92.24213.55281.10013.58274.05232.18982.68764.63454.46695.15142.5658
H102.24213.55283.58271.10012.18984.05232.68764.63454.46692.56585.1514
H113.55282.24214.05232.18981.10013.58274.63452.68765.15142.56584.4669
H123.55282.24212.18984.05233.58271.10014.63452.68762.56585.15144.4669

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 120.987 C1 C3 H9 116.935
C1 C4 C5 120.987 C1 C4 H10 116.935
C2 C5 C4 120.987 C2 C5 H11 116.935
C2 C6 C3 120.987 C2 C6 H12 116.935
C3 C1 C4 118.027 C3 C1 O7 120.987
C3 C6 H12 122.078 C4 C1 O7 120.987
C4 C5 H11 122.078 C5 C2 C6 118.027
C5 C2 O8 120.987 C5 C4 H10 122.078
C6 C2 O8 120.987 C6 C3 H9 122.078
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability