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All results from a given calculation for C8H6 (benzocyclobutadiene)

using model chemistry: G2

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at G2
 hartrees
Energy at 0K-307.765505
Energy at 298.15K-307.758717
HF Energy-306.335694
Nuclear repulsion energy314.407358
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/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 3445 3246 14.46      
2 A1 3385 3190 20.60      
3 A1 3368 3173 20.67      
4 A1 1865 1758 4.45      
5 A1 1740 1640 1.11      
6 A1 1616 1522 7.76      
7 A1 1562 1471 13.42      
8 A1 1288 1214 0.00      
9 A1 1186 1118 1.02      
10 A1 1169 1101 0.06      
11 A1 1007 949 4.62      
12 A1 881 830 0.53      
13 A1 587 553 0.26      
14 A2 1095 1032 0.00      
15 A2 1049 988 0.00      
16 A2 993 935 0.00      
17 A2 848 799 0.00      
18 A2 635 599 0.00      
19 A2 326 307 0.00      
20 B1 1025 966 12.53      
21 B1 849 800 119.32      
22 B1 816 769 1.22      
23 B1 394 371 2.00      
24 B1 265 250 11.57      
25 B2 3414 3217 2.04      
26 B2 3379 3183 44.32      
27 B2 3352 3158 0.82      
28 B2 1833 1727 2.39      
29 B2 1588 1496 6.44      
30 B2 1432 1349 4.33      
31 B2 1381 1301 8.87      
32 B2 1171 1104 2.93      
33 B2 1138 1072 0.28      
34 B2 957 902 0.94      
35 B2 706 665 0.35      
36 B2 458 432 4.68      

Unscaled Zero Point Vibrational Energy (zpe) 26101.6 cm-1
Scaled (by 0.9422) Zero Point Vibrational Energy (zpe) 24592.9 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 MP2=FULL/6-31G*
ABC
0.16064 0.07337 0.05037

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 1.444 -0.622
C2 0.000 0.689 -1.842
C3 0.000 -0.689 -1.842
C4 0.000 -1.444 -0.622
C5 0.000 -0.678 2.041
C6 0.000 0.678 2.041
C7 0.000 0.716 0.528
C8 0.000 -0.716 0.528
H9 0.000 2.531 -0.652
H10 0.000 1.226 -2.786
H11 0.000 -1.226 -2.786
H12 0.000 -2.531 -0.652
H13 0.000 -1.448 2.806
H14 0.000 1.448 2.806

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 C7 C8 H9 H10 H11 H12 H13 H14
C11.43562.45742.88863.40492.77081.36072.44681.08752.17603.43773.97584.48453.4275
C21.43561.37722.45744.11663.88322.36992.75472.19391.08662.13483.43295.11544.7096
C32.45741.37721.43563.88324.11662.75472.36993.43292.13481.08662.19394.70965.1154
C42.88862.45741.43562.77083.40492.44681.36073.97583.43772.17601.08753.42754.4845
C53.40494.11663.88322.77081.35562.05731.51394.18935.18954.85873.26911.08512.2587
C62.77083.88324.11663.40491.35561.51392.05733.26914.85875.18954.18932.25871.0851
C71.36072.36992.75472.44682.05731.51391.43152.16503.35333.84123.45473.14172.3929
C82.44682.75472.36991.36071.51392.05731.43153.45473.84123.35332.16502.39293.1417
H91.08752.19393.43293.97584.18933.26912.16503.45472.50244.32155.06275.27133.6235
H102.17601.08662.13483.43775.18954.85873.35333.84122.50242.45194.32156.19875.5969
H113.43772.13481.08662.17604.85875.18953.84123.35334.32152.45192.50245.59696.1987
H123.97583.43292.19391.08753.26914.18933.45472.16505.06274.32152.50243.62355.2713
H134.48455.11544.70963.42751.08512.25873.14172.39295.27136.19875.59693.62352.8950
H143.42754.70965.11544.48452.25871.08512.39293.14173.62355.59696.19875.27132.8950

picture of benzocyclobutadiene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 121.594 C1 C2 H10 118.783
C1 C7 C6 149.284 C1 C7 N8 122.529
C2 C1 C7 115.878 C2 C1 H9 120.281
C2 C3 C4 121.594 C2 C3 H11 119.624
C3 C2 H10 119.624 C3 C4 N8 115.878
C3 C4 H12 120.281 C4 C3 H11 118.783
C4 N8 C5 149.284 C4 N8 C7 122.529
C5 C6 C7 91.813 C5 C6 H14 134.948
C5 N8 C7 88.187 C6 C5 N8 91.813
C6 C5 H13 134.948 C6 C7 N8 88.187
C7 C1 H9 123.841 C7 C6 H14 133.239
N8 C4 H12 123.841 N8 C5 H13 133.239
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability