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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: MP2/SDD

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/SDD
 hartrees
Energy at 0K-379.861758
Energy at 298.15K-379.865889
Nuclear repulsion energy314.577815
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/SDD
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 3216 3104 0.00      
2 Ag 1623 1566 0.00      
3 Ag 1466 1415 0.00      
4 Ag 1187 1146 0.00      
5 Ag 755 728 0.00      
6 Ag 443 427 0.00      
7 Au 911 880 0.00      
8 Au 331 320 0.00      
9 B1g 724 699 0.00      
10 B1u 3185 3075 1.23      
11 B1u 1532 1479 70.04      
12 B1u 1374 1326 3.41      
13 B1u 940 908 7.15      
14 B1u 735 710 0.00      
15 B2g 918 886 0.00      
16 B2g 693 669 0.00      
17 B2g 206 199 0.00      
18 B2u 3213 3102 17.45      
19 B2u 1578 1523 22.43      
20 B2u 1328 1281 51.23      
21 B2u 1077 1039 61.39      
22 B2u 387 373 25.60      
23 B3g 3185 3075 0.00      
24 B3g 1403 1354 0.00      
25 B3g 1258 1215 0.00      
26 B3g 598 578 0.00      
27 B3g 446 430 0.00      
28 B3u 868 838 101.31      
29 B3u 468 452 8.28      
30 B3u 84 81 15.95      

Unscaled Zero Point Vibrational Energy (zpe) 18065.2 cm-1
Scaled (by 0.9653) Zero Point Vibrational Energy (zpe) 17438.3 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/SDD
ABC
0.16968 0.05216 0.03990

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/SDD

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.466
C2 0.000 0.000 -1.466
C3 0.000 1.288 0.689
C4 0.000 -1.288 0.689
C5 0.000 -1.288 -0.689
C6 0.000 1.288 -0.689
O7 0.000 0.000 2.752
O8 0.000 0.000 -2.752
H9 0.000 2.213 1.272
H10 0.000 -2.213 1.272
H11 0.000 -2.213 -1.272
H12 0.000 2.213 -1.272

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.93251.50431.50432.51042.51041.28584.21842.22192.22193.52113.5211
C22.93252.51042.51041.50431.50434.21841.28583.52113.52112.22192.2219
C31.50432.51042.57552.92071.37732.43233.67391.09423.54944.01282.1684
C41.50432.51042.57551.37732.92072.43233.67393.54941.09422.16844.0128
C52.51041.50432.92071.37732.57553.67392.43234.01282.16841.09423.5494
C62.51041.50431.37732.92072.57553.67392.43232.16844.01283.54941.0942
O71.28584.21842.43232.43233.67393.67395.50422.66252.66254.59284.5928
O84.21841.28583.67393.67392.43232.43235.50424.59284.59282.66252.6625
H92.22193.52111.09423.54944.01282.16842.66254.59284.42675.10592.5444
H102.22193.52113.54941.09422.16844.01282.66254.59284.42672.54445.1059
H113.52112.22194.01282.16841.09423.54944.59282.66255.10592.54444.4267
H123.52112.22192.16844.01283.54941.09424.59282.66252.54445.10594.4267

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.126 C1 C3 H9 116.645
C1 C4 C5 121.126 C1 C4 H10 116.645
C2 C5 C4 121.126 C2 C5 H11 116.645
C2 C6 C3 121.126 C2 C6 H12 116.645
C3 C1 C4 117.749 C3 C1 O7 121.126
C3 C6 H12 122.229 C4 C1 O7 121.126
C4 C5 H11 122.229 C5 C2 C6 117.749
C5 C2 O8 121.126 C5 C4 H10 122.229
C6 C2 O8 121.126 C6 C3 H9 122.229
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability