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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: B1B95/STO-3G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at B1B95/STO-3G
 hartrees
Energy at 0K-376.409016
Energy at 298.15K-376.412943
Nuclear repulsion energy316.223517
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 B1B95/STO-3G
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 3481 3073 0.00      
2 Ag 1813 1601 0.00      
3 Ag 1732 1530 0.00      
4 Ag 1234 1090 0.00      
5 Ag 788 696 0.00      
6 Ag 451 399 0.00      
7 Au 1080 953 0.00      
8 Au 361 319 0.00      
9 B1g 778 687 0.00      
10 B1u 3456 3052 26.87      
11 B1u 1766 1560 18.26      
12 B1u 1469 1297 12.87      
13 B1u 960 848 1.94      
14 B1u 779 688 0.00      
15 B2g 1081 954 0.00      
16 B2g 794 701 0.00      
17 B2g 243 215 0.00      
18 B2u 3479 3072 5.88      
19 B2u 1769 1562 14.96      
20 B2u 1355 1197 62.28      
21 B2u 1135 1003 27.57      
22 B2u 389 343 11.77      
23 B3g 3455 3051 0.00      
24 B3g 1477 1304 0.00      
25 B3g 1266 1118 0.00      
26 B3g 612 540 0.00      
27 B3g 449 396 0.00      
28 B3u 897 792 41.53      
29 B3u 493 436 3.29      
30 B3u 86 76 3.86      

Unscaled Zero Point Vibrational Energy (zpe) 19563.2 cm-1
Scaled (by 0.883) Zero Point Vibrational Energy (zpe) 17274.3 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 B1B95/STO-3G
ABC
0.17197 0.05241 0.04017

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/STO-3G

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.481
C2 0.000 0.000 -1.481
C3 0.000 1.277 0.673
C4 0.000 -1.277 0.673
C5 0.000 -1.277 -0.673
C6 0.000 1.277 -0.673
O7 0.000 0.000 2.745
O8 0.000 0.000 -2.745
H9 0.000 2.214 1.245
H10 0.000 -2.214 1.245
H11 0.000 -2.214 -1.245
H12 0.000 2.214 -1.245

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.96251.51131.51132.50392.50391.26384.22632.22712.22713.51233.5123
C22.96252.50392.50391.51131.51134.22631.26383.51233.51232.22712.2271
C31.51132.50392.55372.88641.34532.43413.64841.09853.53793.98332.1346
C41.51132.50392.55371.34532.88642.43413.64843.53791.09852.13463.9833
C52.50391.51132.88641.34532.55373.64842.43413.98332.13461.09853.5379
C62.50391.51131.34532.88642.55373.64842.43412.13463.98333.53791.0985
O71.26384.22632.43412.43413.64843.64845.49002.67472.67474.56334.5633
O84.22631.26383.64843.64842.43412.43415.49004.56334.56332.67472.6747
H92.22713.51231.09853.53793.98332.13462.67474.56334.42905.08092.4900
H102.22713.51233.53791.09852.13463.98332.67474.56334.42902.49005.0809
H113.51232.22713.98332.13461.09853.53794.56332.67475.08092.49004.4290
H123.51232.22712.13463.98333.53791.09854.56332.67472.49005.08094.4290

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 122.345 C1 C3 H9 116.256
C1 C4 C5 122.345 C1 C4 H10 116.256
C2 C5 C4 122.345 C2 C5 H11 116.256
C2 C6 C3 122.345 C2 C6 H12 116.256
C3 C1 C4 115.310 C3 C1 O7 122.345
C3 C6 H12 121.399 C4 C1 O7 122.345
C4 C5 H11 121.399 C5 C2 C6 115.310
C5 C2 O8 122.345 C5 C4 H10 121.399
C6 C2 O8 122.345 C6 C3 H9 121.399
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.136      
2 C 0.136      
3 C -0.086      
4 C -0.086      
5 C -0.086      
6 C -0.086      
7 O -0.160      
8 O -0.160      
9 H 0.098      
10 H 0.098      
11 H 0.098      
12 H 0.098      


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 -40.831 0.000 0.000
y 0.000 -36.364 0.000
z 0.000 0.000 -50.972
Traceless
 xyz
x 2.837 0.000 0.000
y 0.000 9.538 0.000
z 0.000 0.000 -12.374
Polar
3z2-r2-24.749
x2-y2-4.467
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.347 0.000 0.000
y 0.000 5.562 0.000
z 0.000 0.000 11.260


<r2> (average value of r2) Å2
<r2> 249.376
(<r2>)1/2 15.792