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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: HSEh1PBE/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at HSEh1PBE/3-21G
 hartrees
Energy at 0K-378.943083
Energy at 298.15K-378.947815
HF Energy-378.943083
Nuclear repulsion energy321.877580
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 HSEh1PBE/3-21G
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 3253 3133 0.00      
2 Ag 1743 1679 0.00      
3 Ag 1685 1623 0.00      
4 Ag 1214 1170 0.00      
5 Ag 780 751 0.00      
6 Ag 469 452 0.00      
7 Au 1103 1063 0.00      
8 Au 377 363 0.00      
9 B1g 817 787 0.00      
10 B1u 3231 3112 0.29      
11 B1u 1727 1664 178.44      
12 B1u 1415 1363 8.04      
13 B1u 965 929 14.71      
14 B1u 762 735 1.38      
15 B2g 1117 1076 0.00      
16 B2g 873 841 0.00      
17 B2g 295 284 0.00      
18 B2u 3249 3130 3.04      
19 B2u 1680 1618 19.38      
20 B2u 1333 1285 48.38      
21 B2u 1092 1052 81.81      
22 B2u 401 386 22.30      
23 B3g 3231 3112 0.00      
24 B3g 1413 1362 0.00      
25 B3g 1243 1197 0.00      
26 B3g 615 593 0.00      
27 B3g 457 440 0.00      
28 B3u 976 941 111.39      
29 B3u 549 528 13.80      
30 B3u 110 106 10.43      

Unscaled Zero Point Vibrational Energy (zpe) 19087.4 cm-1
Scaled (by 0.9633) Zero Point Vibrational Energy (zpe) 18386.9 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 HSEh1PBE/3-21G
ABC
0.17869 0.05432 0.04166

See section I.F.4 to change rotational constant units
Geometric Data calculated at HSEh1PBE/3-21G

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.453
C2 0.000 0.000 -1.453
C3 0.000 1.253 0.669
C4 0.000 -1.253 0.669
C5 0.000 -1.253 -0.669
C6 0.000 1.253 -0.669
O7 0.000 0.000 2.693
O8 0.000 0.000 -2.693
H9 0.000 2.170 1.247
H10 0.000 -2.170 1.247
H11 0.000 -2.170 -1.247
H12 0.000 2.170 -1.247

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.90541.47801.47802.46402.46401.24014.14542.17932.17933.46373.4637
C22.90542.46402.46401.47801.47804.14541.24013.46373.46372.17932.1793
C31.47802.46402.50612.84081.33782.38033.58761.08383.47113.92252.1241
C41.47802.46402.50611.33782.84082.38033.58763.47111.08382.12413.9225
C52.46401.47802.84081.33782.50613.58762.38033.92252.12411.08383.4711
C62.46401.47801.33782.84082.50613.58762.38032.12413.92253.47111.0838
O71.24014.14542.38032.38033.58763.58765.38552.60702.60704.49794.4979
O84.14541.24013.58763.58762.38032.38035.38554.49794.49792.60702.6070
H92.17933.46371.08383.47113.92252.12412.60704.49794.33925.00512.4946
H102.17933.46373.47111.08382.12413.92252.60704.49794.33922.49465.0051
H113.46372.17933.92252.12411.08383.47114.49792.60705.00512.49464.3392
H123.46372.17932.12413.92253.47111.08384.49792.60702.49465.00514.3392

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 122.026 C1 C3 H9 115.721
C1 C4 C5 122.026 C1 C4 H10 115.721
C2 C5 C4 122.026 C2 C5 H11 115.721
C2 C6 C3 122.026 C2 C6 H12 115.721
C3 C1 C4 115.949 C3 C1 O7 122.026
C3 C6 H12 122.254 C4 C1 O7 122.026
C4 C5 H11 122.254 C5 C2 C6 115.949
C5 C2 O8 122.026 C5 C4 H10 122.254
C6 C2 O8 122.026 C6 C3 H9 122.254
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability