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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: PBEPBEultrafine/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 PBEPBEultrafine/6-31G*
 hartrees
Energy at 0K-381.011071
Energy at 298.15K-381.015304
Nuclear repulsion energy320.311374
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 PBEPBEultrafine/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 Ag 3148 3096 0.00      
2 Ag 1677 1649 0.00      
3 Ag 1638 1611 0.00      
4 Ag 1136 1117 0.00      
5 Ag 765 753 0.00      
6 Ag 442 435 0.00      
7 Au 975 959 0.00      
8 Au 317 312 0.00      
9 B1g 735 723 0.00      
10 B1u 3128 3076 4.61      
11 B1u 1684 1656 264.08      
12 B1u 1349 1326 5.49      
13 B1u 923 908 17.23      
14 B1u 739 727 1.05      
15 B2g 989 973 0.00      
16 B2g 775 763 0.00      
17 B2g 228 224 0.00      
18 B2u 3145 3093 9.92      
19 B2u 1601 1574 17.96      
20 B2u 1293 1271 71.94      
21 B2u 1055 1037 46.87      
22 B2u 398 391 21.71      
23 B3g 3128 3077 0.00      
24 B3g 1362 1340 0.00      
25 B3g 1203 1183 0.00      
26 B3g 585 575 0.00      
27 B3g 436 428 0.00      
28 B3u 878 864 70.31      
29 B3u 497 488 3.44      
30 B3u 95 93 10.99      

Unscaled Zero Point Vibrational Energy (zpe) 18160.5 cm-1
Scaled (by 0.9835) Zero Point Vibrational Energy (zpe) 17860.8 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 PBEPBEultrafine/6-31G*
ABC
0.17416 0.05434 0.04141

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.451
C2 0.000 0.000 -1.451
C3 0.000 1.270 0.677
C4 0.000 -1.270 0.677
C5 0.000 -1.270 -0.677
C6 0.000 1.270 -0.677
O7 0.000 0.000 2.689
O8 0.000 0.000 -2.689
H9 0.000 2.191 1.270
H10 0.000 -2.191 1.270
H11 0.000 -2.191 -1.270
H12 0.000 2.191 -1.270

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.90181.48741.48742.47812.47811.23764.13952.19852.19853.49323.4932
C22.90182.47812.47811.48741.48744.13951.23763.49323.49322.19852.1985
C31.48742.47812.54032.87861.35382.37913.59721.09523.51163.97102.1534
C41.48742.47812.54031.35382.87862.37913.59723.51161.09522.15343.9710
C52.47811.48742.87861.35382.54033.59722.37913.97102.15341.09523.5116
C62.47811.48741.35382.87862.54033.59722.37912.15343.97103.51161.0952
O71.23764.13952.37912.37913.59723.59725.37712.61032.61034.52424.5242
O84.13951.23763.59723.59722.37912.37915.37714.52424.52422.61032.6103
H92.19853.49321.09523.51163.97102.15342.61034.52424.38205.06472.5394
H102.19853.49323.51161.09522.15343.97102.61034.52424.38202.53945.0647
H113.49322.19853.97102.15341.09523.51164.52422.61035.06472.53944.3820
H123.49322.19852.15343.97103.51161.09524.52422.61032.53945.06474.3820

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.358 C1 C3 H9 115.870
C1 C4 C5 121.358 C1 C4 H10 115.870
C2 C5 C4 121.358 C2 C5 H11 115.870
C2 C6 C3 121.358 C2 C6 H12 115.870
C3 C1 C4 117.285 C3 C1 O7 121.358
C3 C6 H12 122.772 C4 C1 O7 121.358
C4 C5 H11 122.772 C5 C2 C6 117.285
C5 C2 O8 121.358 C5 C4 H10 122.772
C6 C2 O8 121.358 C6 C3 H9 122.772
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBEultrafine/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.406      
2 C 0.406      
3 C -0.167      
4 C -0.167      
5 C -0.167      
6 C -0.167      
7 O -0.427      
8 O -0.427      
9 H 0.177      
10 H 0.177      
11 H 0.177      
12 H 0.177      


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 -44.588 0.000 0.000
y 0.000 -36.966 0.000
z 0.000 0.000 -59.419
Traceless
 xyz
x 3.605 0.000 0.000
y 0.000 15.037 0.000
z 0.000 0.000 -18.642
Polar
3z2-r2-37.284
x2-y2-7.622
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.719 0.000 0.000
y 0.000 9.429 0.000
z 0.000 0.000 15.731


<r2> (average value of r2) Å2
<r2> 245.632
(<r2>)1/2 15.673