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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: B3PW91/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at B3PW91/3-21G*
 hartrees
Energy at 0K-379.192678
Energy at 298.15K-379.197351
Nuclear repulsion energy321.308830
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 B3PW91/3-21G*
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 3239 3108 0.00      
2 Ag 1725 1655 0.00      
3 Ag 1667 1599 0.00      
4 Ag 1211 1162 0.00      
5 Ag 772 740 0.00      
6 Ag 466 447 0.00      
7 Au 1096 1052 0.00      
8 Au 373 358 0.00      
9 B1g 812 779 0.00      
10 B1u 3217 3086 0.59      
11 B1u 1706 1637 176.18      
12 B1u 1410 1353 7.37      
13 B1u 958 919 15.01      
14 B1u 755 725 1.18      
15 B2g 1110 1065 0.00      
16 B2g 867 832 0.00      
17 B2g 292 281 0.00      
18 B2u 3236 3104 4.29      
19 B2u 1664 1597 18.60      
20 B2u 1324 1271 46.77      
21 B2u 1085 1041 84.10      
22 B2u 398 382 21.46      
23 B3g 3217 3086 0.00      
24 B3g 1407 1350 0.00      
25 B3g 1232 1182 0.00      
26 B3g 609 585 0.00      
27 B3g 455 436 0.00      
28 B3u 970 931 109.82      
29 B3u 545 523 13.96      
30 B3u 108 104 10.31      

Unscaled Zero Point Vibrational Energy (zpe) 18963.1 cm-1
Scaled (by 0.9594) Zero Point Vibrational Energy (zpe) 18193.2 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 B3PW91/3-21G*
ABC
0.17814 0.05410 0.04150

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/3-21G*

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 1.255 0.670
C4 0.000 -1.255 0.670
C5 0.000 -1.255 -0.670
C6 0.000 1.255 -0.670
O7 0.000 0.000 2.698
O8 0.000 0.000 -2.698
H9 0.000 2.173 1.248
H10 0.000 -2.173 1.248
H11 0.000 -2.173 -1.248
H12 0.000 2.173 -1.248

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.91141.48071.48072.46842.46841.24264.15402.18252.18253.46823.4682
C22.91142.46842.46841.48071.48074.15401.24263.46823.46822.18252.1825
C31.48072.46842.51002.84521.33982.38533.59441.08443.47603.92752.1258
C41.48072.46842.51001.33982.84522.38533.59443.47601.08442.12583.9275
C52.46841.48072.84521.33982.51003.59442.38533.92752.12581.08443.4760
C62.46841.48071.33982.84522.51003.59442.38532.12583.92753.47601.0844
O71.24264.15402.38532.38533.59443.59445.39672.61232.61234.50464.5046
O84.15401.24263.59443.59442.38532.38535.39674.50464.50462.61232.6123
H92.18253.46821.08443.47603.92752.12582.61234.50464.34525.01082.4955
H102.18253.46823.47601.08442.12583.92752.61234.50464.34522.49555.0108
H113.46822.18253.92752.12581.08443.47604.50462.61235.01082.49554.3452
H123.46822.18252.12583.92753.47601.08444.50462.61232.49555.01084.3452

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 122.052 C1 C3 H9 115.747
C1 C4 C5 122.052 C1 C4 H10 115.747
C2 C5 C4 122.052 C2 C5 H11 115.747
C2 C6 C3 122.052 C2 C6 H12 115.747
C3 C1 C4 115.896 C3 C1 O7 122.052
C3 C6 H12 122.201 C4 C1 O7 122.052
C4 C5 H11 122.201 C5 C2 C6 115.896
C5 C2 O8 122.052 C5 C4 H10 122.201
C6 C2 O8 122.052 C6 C3 H9 122.201
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.382      
2 C 0.382      
3 C -0.224      
4 C -0.224      
5 C -0.224      
6 C -0.224      
7 O -0.455      
8 O -0.455      
9 H 0.261      
10 H 0.261      
11 H 0.261      
12 H 0.261      


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 -45.882 0.000 0.000
y 0.000 -36.902 0.000
z 0.000 0.000 -59.759
Traceless
 xyz
x 2.449 0.000 0.000
y 0.000 15.919 0.000
z 0.000 0.000 -18.368
Polar
3z2-r2-36.735
x2-y2-8.980
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.753 0.000 0.000
y 0.000 8.054 0.000
z 0.000 0.000 14.656


<r2> (average value of r2) Å2
<r2> 245.279
(<r2>)1/2 15.661