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All results from a given calculation for C8H6 (benzocyclobutadiene)

using model chemistry: HF/CEP-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at HF/CEP-31G*
 hartrees
Energy at 0K-47.273495
Energy at 298.15K-47.279522
HF Energy-47.273495
Nuclear repulsion energy152.262636
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 HF/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 A1 3445 3093 12.87      
2 A1 3398 3052 24.73      
3 A1 3380 3035 28.08      
4 A1 1856 1666 1.23      
5 A1 1722 1546 5.49      
6 A1 1617 1452 10.80      
7 A1 1544 1387 11.82      
8 A1 1261 1133 0.00      
9 A1 1187 1066 1.12      
10 A1 1149 1032 0.03      
11 A1 1013 909 6.61      
12 A1 876 786 0.50      
13 A1 572 513 0.17      
14 A2 1099 987 0.00      
15 A2 1034 928 0.00      
16 A2 998 896 0.00      
17 A2 796 715 0.00      
18 A2 616 554 0.00      
19 A2 318 286 0.00      
20 B1 1046 939 15.01      
21 B1 860 772 172.08      
22 B1 827 743 0.45      
23 B1 382 343 3.96      
24 B1 260 233 17.94      
25 B2 3412 3064 1.98      
26 B2 3392 3046 49.03      
27 B2 3357 3014 2.23      
28 B2 1825 1638 3.78      
29 B2 1564 1405 5.02      
30 B2 1404 1261 5.94      
31 B2 1351 1214 6.99      
32 B2 1157 1039 2.68      
33 B2 1115 1001 0.06      
34 B2 941 845 1.77      
35 B2 687 617 0.50      
36 B2 445 399 4.90      

Unscaled Zero Point Vibrational Energy (zpe) 25951.4 cm-1
Scaled (by 0.898) Zero Point Vibrational Energy (zpe) 23304.3 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 HF/CEP-31G*
ABC
0.15869 0.07236 0.04970

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 1.458 -0.622
C2 0.000 0.690 -1.866
C3 0.000 -0.690 -1.866
C4 0.000 -1.458 -0.622
C5 0.000 -0.677 2.062
C6 0.000 0.677 2.062
C7 0.000 0.722 0.530
C8 0.000 -0.722 0.530
H9 0.000 2.536 -0.647
H10 0.000 1.222 -2.804
H11 0.000 -1.222 -2.804
H12 0.000 -2.536 -0.647
H13 0.000 -1.438 2.825
H14 0.000 1.438 2.825

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 C7 C8 H9 H10 H11 H12 H13 H14
C11.46202.48152.91503.42922.79521.36672.46511.07842.19523.45563.99324.50163.4467
C21.46201.37922.48154.15903.92822.39622.78092.21191.07872.12923.44775.15084.7501
C32.48151.37921.46203.92824.15902.78092.39623.44772.12921.07872.21194.75015.1508
C42.91502.48151.46202.79523.42922.46511.36673.99323.45562.19521.07843.44674.5016
C53.42924.15903.92822.79521.35372.07471.53284.20265.22374.89693.28581.07762.2484
C62.79523.92824.15903.42921.35371.53282.07473.28584.89695.22374.20262.24841.0776
C71.36672.39622.78092.46512.07471.53281.44392.16233.37163.85953.46383.15162.4039
C82.46512.78092.39621.36671.53282.07471.44393.46383.85953.37162.16232.40393.1516
H91.07842.21193.44773.99324.20263.28582.16233.46382.52564.33245.07115.27703.6414
H102.19521.07872.12923.45565.22374.89693.37163.85952.52562.44334.33246.22595.6333
H113.45562.12921.07872.19524.89695.22373.85953.37164.33242.44332.52565.63336.2259
H123.99323.44772.21191.07843.28584.20263.46382.16235.07114.33242.52563.64145.2770
H134.50165.15084.75013.44671.07762.24843.15162.40395.27706.22595.63333.64142.8765
H143.44674.75015.15084.50162.24841.07762.40393.15163.64145.63336.22595.27702.8765

picture of benzocyclobutadiene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 121.683 C1 C2 H10 118.764
C1 C7 C6 149.126 C1 C7 N8 122.560
C2 C1 C7 115.757 C2 C1 H9 120.326
C2 C3 C4 121.683 C2 C3 H11 119.552
C3 C2 H10 119.552 C3 C4 N8 115.757
C3 C4 H12 120.326 C4 C3 H11 118.764
C4 N8 C5 149.126 C4 N8 C7 122.560
C5 C6 C7 91.686 C5 C6 H14 134.956
C5 N8 C7 88.314 C6 C5 N8 91.686
C6 C5 H13 134.956 C6 C7 N8 88.314
C7 C1 H9 123.917 C7 C6 H14 133.358
N8 C4 H12 123.917 N8 C5 H13 133.358
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/CEP-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.043      
2 C -0.329      
3 C -0.329      
4 C -0.043      
5 C -0.197      
6 C -0.197      
7 C -0.310      
8 C -0.310      
9 H 0.305      
10 H 0.271      
11 H 0.271      
12 H 0.305      
13 H 0.303      
14 H 0.303      


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 0.765 0.765
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -52.015 0.000 0.000
y 0.000 -40.463 0.000
z 0.000 0.000 -40.299
Traceless
 xyz
x -11.634 0.000 0.000
y 0.000 5.694 0.000
z 0.000 0.000 5.940
Polar
3z2-r211.880
x2-y2-11.552
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.098 0.000 0.000
y 0.000 13.625 0.000
z 0.000 0.000 15.399


<r2> (average value of r2) Å2
<r2> 175.570
(<r2>)1/2 13.250