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All results from a given calculation for C6H4O2 (parabenzoquinone)

using model chemistry: B3LYP/CEP-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 B3LYP/CEP-31G*
 hartrees
Energy at 0K-68.206122
Energy at 298.15K-68.210453
Nuclear repulsion energy159.949415
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 B3LYP/CEP-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 3208 3098 0.00      
2 Ag 1738 1679 0.00      
3 Ag 1674 1617 0.00      
4 Ag 1147 1108 0.00      
5 Ag 769 742 0.00      
6 Ag 436 421 0.00      
7 Au 1019 984 0.00      
8 Au 328 316 0.00      
9 B1g 772 746 0.00      
10 B1u 3178 3069 1.46      
11 B1u 1727 1668 439.69      
12 B1u 1363 1316 6.11      
13 B1u 923 891 12.15      
14 B1u 742 716 1.00      
15 B2g 1019 984 0.00      
16 B2g 782 755 0.00      
17 B2g 237 229 0.00      
18 B2u 3205 3095 9.35      
19 B2u 1652 1596 17.29      
20 B2u 1317 1272 92.42      
21 B2u 1071 1034 39.62      
22 B2u 402 388 25.74      
23 B3g 3180 3071 0.00      
24 B3g 1392 1344 0.00      
25 B3g 1222 1180 0.00      
26 B3g 585 565 0.00      
27 B3g 433 418 0.00      
28 B3u 913 882 99.11      
29 B3u 521 503 7.07      
30 B3u 98 95 13.71      

Unscaled Zero Point Vibrational Energy (zpe) 18526.3 cm-1
Scaled (by 0.9657) Zero Point Vibrational Energy (zpe) 17890.9 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 B3LYP/CEP-31G*
ABC
0.16960 0.05377 0.04083

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/CEP-31G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.462
C2 0.000 0.000 -1.462
C3 0.000 1.289 0.684
C4 0.000 -1.289 0.684
C5 0.000 -1.289 -0.684
C6 0.000 1.289 -0.684
O7 0.000 0.000 2.700
O8 0.000 0.000 -2.700
H9 0.000 2.210 1.274
H10 0.000 -2.210 1.274
H11 0.000 -2.210 -1.274
H12 0.000 2.210 -1.274

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 O7 O8 H9 H10 H11 H12
C12.92471.50571.50572.50312.50311.23774.16252.21802.21803.51703.5170
C22.92472.50312.50311.50571.50574.16251.23773.51703.51702.21802.2180
C31.50572.50312.57732.91741.36712.39313.62071.09403.54804.00882.1632
C41.50572.50312.57731.36712.91742.39313.62073.54801.09402.16324.0088
C52.50311.50572.91741.36712.57733.62072.39314.00882.16321.09403.5480
C62.50311.50571.36712.91742.57733.62072.39312.16324.00883.54801.0940
O71.23774.16252.39312.39313.62073.62075.40022.63032.63034.54694.5469
O84.16251.23773.62073.62072.39312.39315.40024.54694.54692.63032.6303
H92.21803.51701.09403.54804.00882.16322.63034.54694.41995.10132.5472
H102.21803.51703.54801.09402.16324.00882.63034.54694.41992.54725.1013
H113.51702.21804.00882.16321.09403.54804.54692.63035.10132.54724.4199
H123.51702.21802.16324.00883.54801.09404.54692.63032.54725.10134.4199

picture of parabenzoquinone state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C6 121.147 C1 C3 H9 116.215
C1 C4 C5 121.147 C1 C4 H10 116.215
C2 C5 C4 121.147 C2 C5 H11 116.215
C2 C6 C3 121.147 C2 C6 H12 116.215
C3 C1 C4 117.706 C3 C1 O7 121.147
C3 C6 H12 122.638 C4 C1 O7 121.147
C4 C5 H11 122.638 C5 C2 C6 117.706
C5 C2 O8 121.147 C5 C4 H10 122.638
C6 C2 O8 121.147 C6 C3 H9 122.638
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/CEP-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.155      
2 C -0.155      
3 C -0.214      
4 C -0.214      
5 C -0.214      
6 C -0.214      
7 O -0.056      
8 O -0.056      
9 H 0.319      
10 H 0.319      
11 H 0.319      
12 H 0.319      


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 -45.443 0.000 0.000
y 0.000 -36.317 0.000
z 0.000 0.000 -62.102
Traceless
 xyz
x 3.767 0.000 0.000
y 0.000 17.455 0.000
z 0.000 0.000 -21.222
Polar
3z2-r2-42.444
x2-y2-9.125
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.489 0.000 0.000
y 0.000 9.113 0.000
z 0.000 0.000 16.531


<r2> (average value of r2) Å2
<r2> 194.615
(<r2>)1/2 13.950