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All results from a given calculation for C8H6 (benzocyclobutadiene)

using model chemistry: B3PW91/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at B3PW91/6-31G**
 hartrees
Energy at 0K-308.252771
Energy at 298.15K-308.258399
HF Energy-308.252771
Nuclear repulsion energy312.554080
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 B3PW91/6-31G**
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3267 3131 12.00      
2 A1 3220 3086 14.42      
3 A1 3205 3072 11.40      
4 A1 1726 1655 2.90      
5 A1 1598 1532 0.91      
6 A1 1525 1462 2.19      
7 A1 1453 1393 10.38      
8 A1 1192 1142 0.01      
9 A1 1119 1072 0.06      
10 A1 1075 1030 0.66      
11 A1 993 952 3.99      
12 A1 826 792 0.38      
13 A1 549 526 0.15      
14 A2 964 924 0.00      
15 A2 915 877 0.00      
16 A2 877 841 0.00      
17 A2 778 745 0.00      
18 A2 581 557 0.00      
19 A2 296 283 0.00      
20 B1 912 874 7.96      
21 B1 752 720 99.85      
22 B1 725 695 0.51      
23 B1 362 347 1.79      
24 B1 236 226 9.53      
25 B2 3236 3101 1.67      
26 B2 3213 3079 30.35      
27 B2 3192 3060 0.04      
28 B2 1674 1605 0.42      
29 B2 1468 1407 3.68      
30 B2 1310 1255 4.63      
31 B2 1258 1206 11.73      
32 B2 1104 1058 1.95      
33 B2 1052 1008 1.12      
34 B2 874 838 0.50      
35 B2 653 626 0.76      
36 B2 424 407 4.10      

Unscaled Zero Point Vibrational Energy (zpe) 24301.7 cm-1
Scaled (by 0.9584) Zero Point Vibrational Energy (zpe) 23290.8 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 B3PW91/6-31G**
ABC
0.16128 0.07335 0.05042

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-31G**

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 1.441 -0.619
C2 0.000 0.685 -1.844
C3 0.000 -0.685 -1.844
C4 0.000 -1.441 -0.619
C5 0.000 -0.674 2.041
C6 0.000 0.674 2.041
C7 0.000 0.716 0.527
C8 0.000 -0.716 0.527
H9 0.000 2.527 -0.647
H10 0.000 1.224 -2.788
H11 0.000 -1.224 -2.788
H12 0.000 -2.527 -0.647
H13 0.000 -1.444 2.804
H14 0.000 1.444 2.804

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 C7 C8 H9 H10 H11 H12 H13 H14
C11.44012.45452.88263.39862.76811.35632.44281.08652.17963.43643.96884.47663.4229
C21.44011.37062.45454.11653.88552.37202.75482.19691.08622.12983.42855.11304.7101
C32.45451.37061.44013.88554.11652.75482.37203.42852.12981.08622.19694.71015.1130
C42.88262.45451.44012.76813.39862.44281.35633.96883.43642.17961.08653.42294.4766
C53.39864.11653.88552.76811.34892.05541.51434.18095.18854.85983.26511.08372.2516
C62.76813.88554.11653.39861.34891.51432.05543.26514.85985.18854.18092.25161.0837
C71.35632.37202.75482.44282.05541.51431.43202.15903.35363.84103.44963.13832.3904
C82.44282.75482.37201.35631.51432.05541.43203.44963.84103.35362.15902.39043.1383
H91.08652.19693.42853.96884.18093.26512.15903.44962.50564.31925.05485.26163.6176
H102.17961.08622.12983.43645.18854.85983.35363.84102.50562.44864.31926.19575.5960
H113.43642.12981.08622.17964.85985.18853.84103.35364.31922.44862.50565.59606.1957
H123.96883.42852.19691.08653.26514.18093.44962.15905.05484.31922.50563.61765.2616
H134.47665.11304.71013.42291.08372.25163.13832.39045.26166.19575.59603.61762.8878
H143.42294.71015.11304.47662.25161.08372.39043.13833.61765.59606.19575.26162.8878

picture of benzocyclobutadiene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 121.664 C1 C2 H10 118.586
C1 C7 C6 149.242 C1 C7 N8 122.329
C2 C1 C7 116.007 C2 C1 H9 120.152
C2 C3 C4 121.664 C2 C3 H11 119.750
C3 C2 H10 119.750 C3 C4 N8 116.007
C3 C4 H12 120.152 C4 C3 H11 118.586
C4 N8 C5 149.242 C4 N8 C7 122.329
C5 C6 C7 91.571 C5 C6 H14 135.237
C5 N8 C7 88.429 C6 C5 N8 91.571
C6 C5 H13 135.237 C6 C7 N8 88.429
C7 C1 H9 123.841 C7 C6 H14 133.192
N8 C4 H12 123.841 N8 C5 H13 133.192
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.207      
2 C -0.127      
3 C -0.127      
4 C -0.207      
5 C -0.132      
6 C -0.132      
7 C 0.090      
8 C 0.090      
9 H 0.123      
10 H 0.118      
11 H 0.118      
12 H 0.123      
13 H 0.136      
14 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 0.702 0.702
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -49.530 0.000 0.000
y 0.000 -40.088 0.000
z 0.000 0.000 -39.297
Traceless
 xyz
x -9.837 0.000 0.000
y 0.000 4.326 0.000
z 0.000 0.000 5.511
Polar
3z2-r211.023
x2-y2-9.442
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.115 0.000 0.000
y 0.000 13.010 0.000
z 0.000 0.000 15.799


<r2> (average value of r2) Å2
<r2> 219.895
(<r2>)1/2 14.829