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/LANL2DZ

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/LANL2DZ
 hartrees
Energy at 0K-379.854204
Energy at 298.15K-379.858336
Nuclear repulsion energy314.523717
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/LANL2DZ
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 3217 3098 0.00      
2 Ag 1623 1564 0.00      
3 Ag 1466 1412 0.00      
4 Ag 1187 1143 0.00      
5 Ag 755 727 0.00      
6 Ag 443 427 0.00      
7 Au 912 878 0.00      
8 Au 331 319 0.00      
9 B1g 725 698 0.00      
10 B1u 3187 3069 1.38      
11 B1u 1533 1476 69.08      
12 B1u 1374 1323 3.39      
13 B1u 941 906 7.08      
14 B1u 736 709 0.00      
15 B2g 919 885 0.00      
16 B2g 695 669 0.00      
17 B2g 207 199 0.00      
18 B2u 3214 3095 18.05      
19 B2u 1579 1520 22.51      
20 B2u 1328 1279 51.24      
21 B2u 1077 1037 61.26      
22 B2u 387 372 25.68      
23 B3g 3187 3069 0.00      
24 B3g 1403 1352 0.00      
25 B3g 1259 1213 0.00      
26 B3g 599 577 0.00      
27 B3g 446 430 0.00      
28 B3u 869 837 101.96      
29 B3u 468 451 8.39      
30 B3u 84 81 16.00      

Unscaled Zero Point Vibrational Energy (zpe) 18073.6 cm-1
Scaled (by 0.9631) Zero Point Vibrational Energy (zpe) 17406.7 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/LANL2DZ
ABC
0.16966 0.05214 0.03988

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/LANL2DZ

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.467
C2 0.000 0.000 -1.467
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 2.753
O8 0.000 0.000 -2.753
H9 0.000 2.214 1.272
H10 0.000 -2.214 1.272
H11 0.000 -2.214 -1.272
H12 0.000 2.214 -1.272

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.93331.50441.50442.51102.51101.28604.21932.22222.22223.52173.5217
C22.93332.51102.51101.50441.50444.21931.28603.52173.52172.22222.2222
C31.50442.51102.57572.92101.37792.43263.67471.09433.54984.01332.1688
C41.50442.51102.57571.37792.92102.43263.67473.54981.09432.16884.0133
C52.51101.50442.92101.37792.57573.67472.43264.01332.16881.09433.5498
C62.51101.50441.37792.92102.57573.67472.43262.16884.01333.54981.0943
O71.28604.21932.43262.43263.67473.67475.50542.66312.66314.59354.5935
O84.21931.28603.67473.67472.43262.43265.50544.59354.59352.66312.6631
H92.22223.52171.09433.54984.01332.16882.66314.59354.42745.10652.5445
H102.22223.52173.54981.09432.16884.01332.66314.59354.42742.54455.1065
H113.52172.22224.01332.16881.09433.54984.59352.66315.10652.54454.4274
H123.52172.22222.16884.01333.54981.09434.59352.66312.54455.10654.4274

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.128 C1 C3 H9 116.659
C1 C4 C5 121.128 C1 C4 H10 116.659
C2 C5 C4 121.128 C2 C5 H11 116.659
C2 C6 C3 121.128 C2 C6 H12 116.659
C3 C1 C4 117.744 C3 C1 O7 121.128
C3 C6 H12 122.213 C4 C1 O7 121.128
C4 C5 H11 122.213 C5 C2 C6 117.744
C5 C2 O8 121.128 C5 C4 H10 122.213
C6 C2 O8 121.128 C6 C3 H9 122.213
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability