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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: MP2/cc-pVDZ

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/cc-pVDZ
 hartrees
Energy at 0K-380.380377
Energy at 298.15K-380.384755
Nuclear repulsion energy320.163311
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/cc-pVDZ
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 3248 3093 0.00      
2 Ag 1715 1633 0.00      
3 Ag 1651 1572 0.00      
4 Ag 1148 1093 0.00      
5 Ag 787 749 0.00      
6 Ag 446 425 0.00      
7 Au 1002 955 0.00      
8 Au 329 314 0.00      
9 B1g 762 726 0.00      
10 B1u 3227 3074 0.78      
11 B1u 1715 1633 142.33      
12 B1u 1369 1304 7.85      
13 B1u 940 895 10.90      
14 B1u 758 722 0.26      
15 B2g 1001 953 0.00      
16 B2g 768 732 0.00      
17 B2g 218 208 0.00      
18 B2u 3246 3092 3.72      
19 B2u 1640 1562 22.26      
20 B2u 1335 1272 77.35      
21 B2u 1075 1024 42.02      
22 B2u 406 387 22.36      
23 B3g 3228 3075 0.00      
24 B3g 1418 1351 0.00      
25 B3g 1234 1175 0.00      
26 B3g 600 572 0.00      
27 B3g 441 420 0.00      
28 B3u 903 860 71.14      
29 B3u 511 486 4.18      
30 B3u 92 88 9.94      

Unscaled Zero Point Vibrational Energy (zpe) 18605.7 cm-1
Scaled (by 0.9525) Zero Point Vibrational Energy (zpe) 17721.9 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 MP2/cc-pVDZ
ABC
0.17404 0.05424 0.04135

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.456
C2 0.000 0.000 -1.456
C3 0.000 1.270 0.679
C4 0.000 -1.270 0.679
C5 0.000 -1.270 -0.679
C6 0.000 1.270 -0.679
O7 0.000 0.000 2.689
O8 0.000 0.000 -2.689
H9 0.000 2.196 1.265
H10 0.000 -2.196 1.265
H11 0.000 -2.196 -1.265
H12 0.000 2.196 -1.265

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.91201.48891.48892.48422.48421.23324.14532.20402.20403.49603.4960
C22.91202.48422.48421.48891.48894.14531.23323.49603.49602.20402.2040
C31.48892.48422.54012.88031.35792.37793.59971.09533.51483.97342.1526
C41.48892.48422.54011.35792.88032.37793.59973.51481.09532.15263.9734
C52.48421.48892.88031.35792.54013.59972.37793.97342.15261.09533.5148
C62.48421.48891.35792.88032.54013.59972.37792.15263.97343.51481.0953
O71.23324.14532.37792.37793.59973.59975.37852.61742.61744.52254.5225
O84.14531.23323.59973.59972.37792.37795.37854.52254.52252.61742.6174
H92.20403.49601.09533.51483.97342.15262.61744.52254.39135.06752.5290
H102.20403.49603.51481.09532.15263.97342.61744.52254.39132.52905.0675
H113.49602.20403.97342.15261.09533.51484.52252.61745.06752.52904.3913
H123.49602.20402.15263.97343.51481.09534.52252.61742.52905.06754.3913

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.461 C1 C3 H9 116.219
C1 C4 C5 121.461 C1 C4 H10 116.219
C2 C5 C4 121.461 C2 C5 H11 116.219
C2 C6 C3 121.461 C2 C6 H12 116.219
C3 C1 C4 117.078 C3 C1 O7 121.461
C3 C6 H12 122.320 C4 C1 O7 121.461
C4 C5 H11 122.320 C5 C2 C6 117.078
C5 C2 O8 121.461 C5 C4 H10 122.320
C6 C2 O8 121.461 C6 C3 H9 122.320
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability