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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: PBE1PBE/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at PBE1PBE/6-31G*
 hartrees
Energy at 0K-381.020589
Energy at 298.15K-381.025029
HF Energy-381.020589
Nuclear repulsion energy322.924459
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 PBE1PBE/6-31G*
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 3249 3088 0.00      
2 Ag 1801 1711 0.00      
3 Ag 1722 1636 0.00      
4 Ag 1174 1115 0.00      
5 Ag 792 753 0.00      
6 Ag 455 432 0.00      
7 Au 1023 972 0.00      
8 Au 337 321 0.00      
9 B1g 762 724 0.00      
10 B1u 3230 3069 1.99      
11 B1u 1801 1712 352.45      
12 B1u 1395 1326 7.86      
13 B1u 956 908 16.17      
14 B1u 766 728 0.97      
15 B2g 1031 980 0.00      
16 B2g 803 763 0.00      
17 B2g 237 226 0.00      
18 B2u 3247 3086 4.35      
19 B2u 1689 1605 18.56      
20 B2u 1347 1280 84.74      
21 B2u 1095 1040 44.40      
22 B2u 415 394 26.44      
23 B3g 3230 3070 0.00      
24 B3g 1420 1350 0.00      
25 B3g 1250 1188 0.00      
26 B3g 606 576 0.00      
27 B3g 449 426 0.00      
28 B3u 912 867 87.37      
29 B3u 515 489 3.01      
30 B3u 97 92 12.95      

Unscaled Zero Point Vibrational Energy (zpe) 18902.1 cm-1
Scaled (by 0.9503) Zero Point Vibrational Energy (zpe) 17962.7 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 PBE1PBE/6-31G*
ABC
0.17556 0.05542 0.04212

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/6-31G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.441
C2 0.000 0.000 -1.441
C3 0.000 1.266 0.670
C4 0.000 -1.266 0.670
C5 0.000 -1.266 -0.670
C6 0.000 1.266 -0.670
O7 0.000 0.000 2.661
O8 0.000 0.000 -2.661
H9 0.000 2.179 1.258
H10 0.000 -2.179 1.258
H11 0.000 -2.179 -1.258
H12 0.000 2.179 -1.258

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.88121.48171.48172.46102.46101.21994.10112.18672.18673.46893.4689
C22.88122.46102.46101.48171.48174.10111.21993.46893.46892.18672.1867
C31.48172.46102.53112.86401.34002.35873.56291.08663.49463.94782.1339
C41.48172.46102.53111.34002.86402.35873.56293.49461.08662.13393.9478
C52.46101.48172.86401.34002.53113.56292.35873.94782.13391.08663.4946
C62.46101.48171.34002.86402.53113.56292.35872.13393.94783.49461.0866
O71.21994.10112.35872.35873.56293.56295.32102.59122.59124.48404.4840
O84.10111.21993.56293.56292.35872.35875.32104.48404.48402.59122.5912
H92.18673.46891.08663.49463.94782.13392.59124.48404.35825.03282.5169
H102.18673.46893.49461.08662.13393.94782.59124.48404.35822.51695.0328
H113.46892.18673.94782.13391.08663.49464.48402.59125.03282.51694.3582
H123.46892.18672.13393.94783.49461.08664.48402.59122.51695.03284.3582

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.337 C1 C3 H9 115.878
C1 C4 C5 121.337 C1 C4 H10 115.878
C2 C5 C4 121.337 C2 C5 H11 115.878
C2 C6 C3 121.337 C2 C6 H12 115.878
C3 C1 C4 117.327 C3 C1 O7 121.337
C3 C6 H12 122.786 C4 C1 O7 121.337
C4 C5 H11 122.786 C5 C2 C6 117.327
C5 C2 O8 121.337 C5 C4 H10 122.786
C6 C2 O8 121.337 C6 C3 H9 122.786
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.431      
2 C 0.431      
3 C -0.200      
4 C -0.200      
5 C -0.200      
6 C -0.200      
7 O -0.453      
8 O -0.453      
9 H 0.211      
10 H 0.211      
11 H 0.211      
12 H 0.211      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 0.000 0.000
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -44.673 0.000 0.000
y 0.000 -36.642 0.000
z 0.000 0.000 -60.039
Traceless
 xyz
x 3.667 0.000 0.000
y 0.000 15.714 0.000
z 0.000 0.000 -19.381
Polar
3z2-r2-38.762
x2-y2-8.032
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.682 0.000 0.000
y 0.000 8.780 0.000
z 0.000 0.000 15.313


<r2> (average value of r2) Å2
<r2> 242.129
(<r2>)1/2 15.560