return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: PBEPBE/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 PBEPBE/6-31G**
 hartrees
Energy at 0K-381.016755
Energy at 298.15K-381.021000
Nuclear repulsion energy320.340035
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 PBEPBE/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 3147 3104 0.00      
2 Ag 1676 1653 0.00      
3 Ag 1637 1614 0.00      
4 Ag 1126 1111 0.00      
5 Ag 764 754 0.00      
6 Ag 442 436 0.00      
7 Au 976 963 0.00      
8 Au 317 312 0.00      
9 B1g 734 724 0.00      
10 B1u 3127 3084 3.44      
11 B1u 1683 1660 262.58      
12 B1u 1339 1320 6.55      
13 B1u 919 906 16.62      
14 B1u 738 728 1.08      
15 B2g 987 973 0.00      
16 B2g 774 764 0.00      
17 B2g 227 224 0.00      
18 B2u 3144 3101 7.95      
19 B2u 1599 1577 18.01      
20 B2u 1287 1269 74.79      
21 B2u 1049 1035 44.09      
22 B2u 397 392 21.59      
23 B3g 3127 3085 0.00      
24 B3g 1357 1338 0.00      
25 B3g 1195 1179 0.00      
26 B3g 584 576 0.00      
27 B3g 434 428 0.00      
28 B3u 877 865 68.02      
29 B3u 496 489 3.31      
30 B3u 95 94 11.08      

Unscaled Zero Point Vibrational Energy (zpe) 18126.1 cm-1
Scaled (by 0.9863) Zero Point Vibrational Energy (zpe) 17877.8 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 PBEPBE/6-31G**
ABC
0.17415 0.05435 0.04142

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/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 2.688
O8 0.000 0.000 -2.688
H9 0.000 2.191 1.269
H10 0.000 -2.191 1.269
H11 0.000 -2.191 -1.269
H12 0.000 2.191 -1.269

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.90131.48741.48742.47782.47781.23764.13892.19802.19803.49233.4923
C22.90132.47782.47781.48741.48744.13891.23763.49233.49232.19802.1980
C31.48742.47782.54062.87861.35352.37903.59681.09453.51123.97042.1527
C41.48742.47782.54061.35352.87862.37903.59683.51121.09452.15273.9704
C52.47781.48742.87861.35352.54063.59682.37903.97042.15271.09453.5112
C62.47781.48741.35352.87862.54063.59682.37902.15273.97043.51121.0945
O71.23764.13892.37902.37903.59683.59685.37652.61002.61004.52344.5234
O84.13891.23763.59683.59682.37902.37905.37654.52344.52342.61002.6100
H92.19803.49231.09453.51123.97042.15272.61004.52344.38115.06342.5386
H102.19803.49233.51121.09452.15273.97042.61004.52344.38112.53865.0634
H113.49232.19803.97042.15271.09453.51124.52342.61005.06342.53864.3811
H123.49232.19802.15273.97043.51121.09454.52342.61002.53865.06344.3811

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.351 C1 C3 H9 115.873
C1 C4 C5 121.351 C1 C4 H10 115.873
C2 C5 C4 121.351 C2 C5 H11 115.873
C2 C6 C3 121.351 C2 C6 H12 115.873
C3 C1 C4 117.298 C3 C1 O7 121.351
C3 C6 H12 122.776 C4 C1 O7 121.351
C4 C5 H11 122.776 C5 C2 C6 117.298
C5 C2 O8 121.351 C5 C4 H10 122.776
C6 C2 O8 121.351 C6 C3 H9 122.776
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.382      
2 C 0.382      
3 C -0.115      
4 C -0.115      
5 C -0.115      
6 C -0.115      
7 O -0.425      
8 O -0.425      
9 H 0.136      
10 H 0.136      
11 H 0.136      
12 H 0.136      


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 -44.550 0.000 0.000
y 0.000 -36.990 0.000
z 0.000 0.000 -59.437
Traceless
 xyz
x 3.664 0.000 0.000
y 0.000 15.004 0.000
z 0.000 0.000 -18.668
Polar
3z2-r2-37.335
x2-y2-7.560
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.763 0.000 0.000
y 0.000 9.485 0.000
z 0.000 0.000 15.763


<r2> (average value of r2) Å2
<r2> 245.589
(<r2>)1/2 15.671