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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-67.644699
Energy at 298.15K-67.648998
Nuclear repulsion energy159.459283
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 3240 3077 0.00      
2 Ag 1704 1618 0.00      
3 Ag 1628 1546 0.00      
4 Ag 1160 1101 0.00      
5 Ag 785 746 0.00      
6 Ag 436 414 0.00      
7 Au 986 936 0.00      
8 Au 337 320 0.00      
9 B1g 773 734 0.00      
10 B1u 3210 3048 0.14      
11 B1u 1685 1600 202.00      
12 B1u 1374 1304 7.17      
13 B1u 940 892 8.16      
14 B1u 753 715 0.26      
15 B2g 980 930 0.00      
16 B2g 737 700 0.00      
17 B2g 225 214 0.00      
18 B2u 3240 3076 7.20      
19 B2u 1641 1558 24.63      
20 B2u 1351 1283 83.24      
21 B2u 1086 1031 35.93      
22 B2u 400 380 25.20      
23 B3g 3212 3050 0.00      
24 B3g 1429 1357 0.00      
25 B3g 1251 1187 0.00      
26 B3g 592 562 0.00      
27 B3g 433 411 0.00      
28 B3u 909 863 101.21      
29 B3u 507 481 6.59      
30 B3u 94 89 13.05      

Unscaled Zero Point Vibrational Energy (zpe) 18548.4 cm-1
Scaled (by 0.9494) Zero Point Vibrational Energy (zpe) 17609.8 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
0.17000 0.05327 0.04056

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 1.464
C2 0.000 0.000 -1.464
C3 0.000 1.286 0.688
C4 0.000 -1.286 0.688
C5 0.000 -1.286 -0.688
C6 0.000 1.286 -0.688
O7 0.000 0.000 2.715
O8 0.000 0.000 -2.715
H9 0.000 2.212 1.274
H10 0.000 -2.212 1.274
H11 0.000 -2.212 -1.274
H12 0.000 2.212 -1.274

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.92711.50191.50192.50702.50701.25124.17822.22062.22063.51953.5195
C22.92712.50702.50701.50191.50194.17821.25123.51953.51952.22062.2206
C31.50192.50702.57282.91791.37662.40023.63801.09553.54754.01142.1695
C41.50192.50702.57281.37662.91792.40023.63803.54751.09552.16954.0114
C52.50701.50192.91791.37662.57283.63802.40024.01142.16951.09553.5475
C62.50701.50191.37662.91792.57283.63802.40022.16954.01143.54751.0955
O71.25124.17822.40022.40023.63803.63805.42942.64042.64044.56094.5609
O84.17821.25123.63803.63802.40022.40025.42944.56094.56092.64042.6404
H92.22063.51951.09553.54754.01142.16952.64044.56094.42495.10572.5472
H102.22063.51953.54751.09552.16954.01142.64044.56094.42492.54725.1057
H113.51952.22064.01142.16951.09553.54754.56092.64045.10572.54724.4249
H123.51952.22062.16954.01143.54751.09554.56092.64042.54725.10574.4249

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.075 C1 C3 H9 116.629
C1 C4 C5 121.075 C1 C4 H10 116.629
C2 C5 C4 121.075 C2 C5 H11 116.629
C2 C6 C3 121.075 C2 C6 H12 116.629
C3 C1 C4 117.849 C3 C1 O7 121.075
C3 C6 H12 122.295 C4 C1 O7 121.075
C4 C5 H11 122.295 C5 C2 C6 117.849
C5 C2 O8 121.075 C5 C4 H10 122.295
C6 C2 O8 121.075 C6 C3 H9 122.295
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability