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All results from a given calculation for C8H6 (benzocyclobutadiene)

using model chemistry: CCD/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 CCD/6-31G**
 hartrees
Energy at 0K-307.422651
Energy at 298.15K-307.428010
HF Energy-306.345165
Nuclear repulsion energy312.237187
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 CCD/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 3329 3121 12.35      
2 A1 3278 3074 15.74      
3 A1 3263 3059 14.29      
4 A1 1764 1654 1.33      
5 A1 1614 1514 2.00      
6 A1 1547 1450 2.38      
7 A1 1481 1388 8.63      
8 A1 1221 1145 0.04      
9 A1 1128 1057 0.18      
10 A1 1103 1034 0.07      
11 A1 986 924 2.47      
12 A1 838 786 0.37      
13 A1 554 519 0.14      
14 A2 919 862 0.00      
15 A2 881 826 0.00      
16 A2 829 778 0.00      
17 A2 536 503 0.00      
18 A2 473 444 0.00      
19 A2 286 269 0.00      
20 B1 874 819 6.64      
21 B1 751 704 75.71      
22 B1 704 660 23.52      
23 B1 334 313 0.27      
24 B1 223 209 9.32      
25 B2 3300 3094 2.73      
26 B2 3272 3067 32.86      
27 B2 3249 3047 0.10      
28 B2 1733 1625 0.13      
29 B2 1504 1410 3.64      
30 B2 1346 1262 3.27      
31 B2 1295 1215 11.55      
32 B2 1122 1052 1.31      
33 B2 1073 1006 1.16      
34 B2 892 836 0.46      
35 B2 667 625 1.30      
36 B2 429 402 2.98      

Unscaled Zero Point Vibrational Energy (zpe) 24397.9 cm-1
Scaled (by 0.9376) Zero Point Vibrational Energy (zpe) 22875.5 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 CCD/6-31G**
ABC
0.16064 0.07327 0.05032

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 1.445 -0.618
C2 0.000 0.685 -1.847
C3 0.000 -0.685 -1.847
C4 0.000 -1.445 -0.618
C5 0.000 -0.676 2.044
C6 0.000 0.676 2.044
C7 0.000 0.719 0.525
C8 0.000 -0.719 0.525
H9 0.000 2.527 -0.646
H10 0.000 1.220 -2.787
H11 0.000 -1.220 -2.787
H12 0.000 -2.527 -0.646
H13 0.000 -1.441 2.806
H14 0.000 1.441 2.806

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 C7 C8 H9 H10 H11 H12 H13 H14
C11.44472.45912.89023.40432.77141.35492.44741.08202.18083.43593.97194.47803.4239
C21.44471.37022.45914.12253.89132.37262.75662.19861.08172.12423.42905.11534.7136
C32.45911.37021.44473.89134.12252.75662.37263.42902.12421.08172.19864.71365.1153
C42.89022.45911.44472.77143.40432.44741.35493.97193.43592.18081.08203.42394.4780
C53.40434.12253.89132.77141.35232.06221.51954.18295.19034.86223.26541.07912.2498
C62.77143.89134.12253.40431.35231.51952.06223.26544.86225.19034.18292.24981.0791
C71.35492.37262.75662.44742.06221.51951.43732.15443.35053.83813.45033.14052.3919
C82.44742.75662.37261.35491.51952.06221.43733.45033.83813.35052.15442.39193.1405
H91.08202.19863.42903.97194.18293.26542.15443.45032.50894.31515.05355.25893.6184
H102.18081.08172.12423.43595.19034.86223.35053.83812.50892.43904.31516.19365.5974
H113.43592.12421.08172.18084.86225.19033.83813.35054.31512.43902.50895.59746.1936
H123.97193.42902.19861.08203.26544.18293.45032.15445.05354.31512.50893.61845.2589
H134.47805.11534.71363.42391.07912.24983.14052.39195.25896.19365.59743.61842.8818
H143.42394.71365.11534.47802.24981.07912.39193.14053.61845.59746.19365.25892.8818

picture of benzocyclobutadiene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 121.738 C1 C2 H10 118.656
C1 C7 C6 149.180 C1 C7 N8 122.422
C2 C1 C7 115.840 C2 C1 H9 120.269
C2 C3 C4 121.738 C2 C3 H11 119.606
C3 C2 H10 119.606 C3 C4 N8 115.840
C3 C4 H12 120.269 C4 C3 H11 118.656
C4 N8 C5 149.180 C4 N8 C7 122.422
C5 C6 C7 91.603 C5 C6 H14 135.132
C5 N8 C7 88.397 C6 C5 N8 91.603
C6 C5 H13 135.132 C6 C7 N8 88.397
C7 C1 H9 123.891 C7 C6 H14 133.266
N8 C4 H12 123.891 N8 C5 H13 133.266
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability