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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: CID/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 CID/3-21G
 hartrees
Energy at 0K-377.734571
Energy at 298.15K-377.739362
Nuclear repulsion energy321.716481
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 CID/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 3317 3090 0.00      
2 Ag 1838 1713 0.00      
3 Ag 1752 1632 0.00      
4 Ag 1265 1179 0.00      
5 Ag 774 721 0.00      
6 Ag 479 446 0.00      
7 Au 1118 1041 0.00      
8 Au 391 365 0.00      
9 B1g 830 774 0.00      
10 B1u 3294 3068 0.23      
11 B1u 1816 1691 188.18      
12 B1u 1468 1367 6.16      
13 B1u 987 920 10.48      
14 B1u 765 713 0.20      
15 B2g 1111 1035 0.00      
16 B2g 863 804 0.00      
17 B2g 285 265 0.00      
18 B2u 3313 3087 4.78      
19 B2u 1751 1632 9.32      
20 B2u 1366 1273 48.87      
21 B2u 1120 1044 87.35      
22 B2u 414 385 26.08      
23 B3g 3293 3068 0.00      
24 B3g 1460 1361 0.00      
25 B3g 1270 1183 0.00      
26 B3g 629 586 0.00      
27 B3g 477 444 0.00      
28 B3u 987 919 121.91      
29 B3u 550 512 8.30      
30 B3u 101 94 12.31      

Unscaled Zero Point Vibrational Energy (zpe) 19542.3 cm-1
Scaled (by 0.9316) Zero Point Vibrational Energy (zpe) 18205.6 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 CID/3-21G
ABC
0.17602 0.05456 0.04165

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.455
C2 0.000 0.000 -1.455
C3 0.000 1.264 0.665
C4 0.000 -1.264 0.665
C5 0.000 -1.264 -0.665
C6 0.000 1.264 -0.665
O7 0.000 0.000 2.686
O8 0.000 0.000 -2.686
H9 0.000 2.177 1.240
H10 0.000 -2.177 1.240
H11 0.000 -2.177 -1.240
H12 0.000 2.177 -1.240

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.91051.49031.49032.46872.46871.23034.14082.18732.18733.46473.4647
C22.91052.46872.46871.49031.49034.14081.23033.46473.46472.18732.1873
C31.49032.46872.52772.85661.33082.38293.58131.07893.48833.93312.1131
C41.49032.46872.52771.33082.85662.38293.58133.48831.07892.11313.9331
C52.46871.49032.85661.33082.52773.58132.38293.93312.11311.07893.4883
C62.46871.49031.33082.85662.52773.58132.38292.11313.93313.48831.0789
O71.23034.14082.38292.38293.58133.58135.37112.61282.61284.48894.4889
O84.14081.23033.58133.58132.38292.38295.37114.48894.48892.61282.6128
H92.18733.46471.07893.48833.93312.11312.61284.48894.35345.01062.4807
H102.18733.46473.48831.07892.11313.93312.61284.48894.35342.48075.0106
H113.46472.18733.93312.11311.07893.48834.48892.61285.01062.48074.3534
H123.46472.18732.11313.93313.48831.07894.48892.61282.48075.01064.3534

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 122.004 C1 C3 H9 115.793
C1 C4 C5 122.004 C1 C4 H10 115.793
C2 C5 C4 122.004 C2 C5 H11 115.793
C2 C6 C3 122.004 C2 C6 H12 115.793
C3 C1 C4 115.993 C3 C1 O7 122.004
C3 C6 H12 122.203 C4 C1 O7 122.004
C4 C5 H11 122.203 C5 C2 C6 115.993
C5 C2 O8 122.004 C5 C4 H10 122.203
C6 C2 O8 122.004 C6 C3 H9 122.203
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability