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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-47.147807
Energy at 298.15K-47.153958
HF Energy-47.147807
Nuclear repulsion energy151.786466
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 3471 3128 16.03      
2 A1 3415 3078 30.42      
3 A1 3392 3058 32.33      
4 A1 1843 1662 0.13      
5 A1 1689 1522 7.51      
6 A1 1613 1454 10.91      
7 A1 1554 1401 16.77      
8 A1 1291 1164 0.07      
9 A1 1188 1071 0.14      
10 A1 1162 1047 0.55      
11 A1 1024 923 5.17      
12 A1 869 783 0.03      
13 A1 581 524 0.01      
14 A2 1135 1023 0.00      
15 A2 1054 950 0.00      
16 A2 1022 922 0.00      
17 A2 809 729 0.00      
18 A2 630 568 0.00      
19 A2 328 296 0.00      
20 B1 1086 979 15.86      
21 B1 882 795 202.70      
22 B1 841 758 3.47      
23 B1 403 363 7.63      
24 B1 262 237 21.95      
25 B2 3432 3094 0.54      
26 B2 3405 3069 54.37      
27 B2 3367 3035 2.55      
28 B2 1814 1635 2.43      
29 B2 1577 1422 8.09      
30 B2 1422 1282 3.34      
31 B2 1367 1232 9.09      
32 B2 1176 1060 2.50      
33 B2 1136 1024 0.09      
34 B2 952 858 1.51      
35 B2 705 635 0.44      
36 B2 445 401 5.94      

Unscaled Zero Point Vibrational Energy (zpe) 26171.0 cm-1
Scaled (by 0.9014) Zero Point Vibrational Energy (zpe) 23590.6 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
0.15778 0.07173 0.04931

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 1.462 -0.627
C2 0.000 0.693 -1.873
C3 0.000 -0.693 -1.873
C4 0.000 -1.462 -0.627
C5 0.000 -0.683 2.074
C6 0.000 0.683 2.074
C7 0.000 0.726 0.530
C8 0.000 -0.726 0.530
H9 0.000 2.537 -0.654
H10 0.000 1.225 -2.808
H11 0.000 -1.225 -2.808
H12 0.000 -2.537 -0.654
H13 0.000 -1.441 2.832
H14 0.000 1.441 2.832

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 C7 C8 H9 H10 H11 H12 H13 H14
C11.46442.49022.92483.44942.81131.37112.47531.07462.19433.46163.99924.51593.4590
C21.46441.38692.49024.18053.94742.40312.79092.21001.07582.13453.45265.16664.7642
C32.49021.38691.46443.94744.18052.79092.40313.45262.13451.07582.21004.76425.1666
C42.92482.49021.46442.81133.44942.47531.37113.99923.46162.19431.07463.45904.5159
C53.44944.18053.94742.81131.36592.09061.54514.22015.24224.91263.29841.07182.2550
C62.81133.94744.18053.44941.36591.54512.09063.29844.91265.24224.22012.25501.0718
C71.37112.40312.79092.47532.09061.54511.45212.16323.37523.86663.47093.16172.4107
C82.47532.79092.40311.37111.54512.09061.45213.47093.86663.37522.16322.41073.1617
H91.07462.21003.45263.99924.22013.29842.16323.47092.52224.33525.07345.28903.6542
H102.19431.07582.13453.46165.24224.91263.37523.86662.52222.45054.33526.23875.6445
H113.46162.13451.07582.19434.91265.24223.86663.37524.33522.45052.52225.64456.2387
H123.99923.45262.21001.07463.29844.22013.47092.16325.07344.33522.52223.65425.2890
H134.51595.16664.76423.45901.07182.25503.16172.41075.28906.23875.64453.65422.8817
H143.45904.76425.16664.51592.25501.07182.41073.16173.65425.64456.23875.28902.8817

picture of benzocyclobutadiene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 121.675 C1 C2 H10 118.701
C1 C7 C6 149.116 C1 C7 N8 122.483
C2 C1 C7 115.843 C2 C1 H9 120.231
C2 C3 C4 121.675 C2 C3 H11 119.625
C3 C2 H10 119.625 C3 C4 N8 115.843
C3 C4 H12 120.231 C4 C3 H11 118.701
C4 N8 C5 149.116 C4 N8 C7 122.483
C5 C6 C7 91.599 C5 C6 H14 135.002
C5 N8 C7 88.401 C6 C5 N8 91.599
C6 C5 H13 135.002 C6 C7 N8 88.401
C7 C1 H9 123.926 C7 C6 H14 133.400
N8 C4 H12 123.926 N8 C5 H13 133.400
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 -0.052      
2 C -0.298      
3 C -0.298      
4 C -0.052      
5 C -0.122      
6 C -0.122      
7 C -0.355      
8 C -0.355      
9 H 0.286      
10 H 0.246      
11 H 0.246      
12 H 0.286      
13 H 0.296      
14 H 0.296      


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 0.537 0.537
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -52.783 0.000 0.000
y 0.000 -41.218 0.000
z 0.000 0.000 -41.089
Traceless
 xyz
x -11.629 0.000 0.000
y 0.000 5.718 0.000
z 0.000 0.000 5.911
Polar
3z2-r211.823
x2-y2-11.564
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.691 0.000 0.000
y 0.000 13.631 0.000
z 0.000 0.000 15.037


<r2> (average value of r2) Å2
<r2> 177.051
(<r2>)1/2 13.306