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All results from a given calculation for C8H6 (benzocyclobutadiene)

using model chemistry: QCISD/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 QCISD/6-31G**
 hartrees
Energy at 0K-307.434315
Energy at 298.15K-307.439672
HF Energy-306.344706
Nuclear repulsion energy311.876210
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 QCISD/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 3318 3123 13.15      
2 A1 3268 3076 16.82      
3 A1 3252 3061 14.33      
4 A1 1753 1650 1.52      
5 A1 1596 1503 2.12      
6 A1 1541 1450 2.27      
7 A1 1472 1386 8.89      
8 A1 1217 1146 0.05      
9 A1 1121 1055 0.34      
10 A1 1098 1034 0.08      
11 A1 979 921 2.58      
12 A1 833 784 0.30      
13 A1 551 519 0.15      
14 A2 919 865 0.00      
15 A2 878 827 0.00      
16 A2 824 776 0.00      
17 A2 538 507 0.00      
18 A2 490 462 0.00      
19 A2 286 269 0.00      
20 B1 873 822 6.96      
21 B1 749 706 76.32      
22 B1 704 663 21.65      
23 B1 333 314 0.31      
24 B1 226 212 9.33      
25 B2 3289 3096 2.09      
26 B2 3261 3070 33.82      
27 B2 3238 3048 0.20      
28 B2 1718 1617 0.23      
29 B2 1496 1408 3.90      
30 B2 1340 1262 3.16      
31 B2 1289 1213 9.76      
32 B2 1115 1049 1.30      
33 B2 1066 1004 0.99      
34 B2 889 837 0.46      
35 B2 662 624 0.68      
36 B2 427 402 3.36      

Unscaled Zero Point Vibrational Energy (zpe) 24303.5 cm-1
Scaled (by 0.9414) Zero Point Vibrational Energy (zpe) 22879.3 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 QCISD/6-31G**
ABC
0.16015 0.07314 0.05021

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 1.447 -0.619
C2 0.000 0.686 -1.849
C3 0.000 -0.686 -1.849
C4 0.000 -1.447 -0.619
C5 0.000 -0.678 2.046
C6 0.000 0.678 2.046
C7 0.000 0.720 0.527
C8 0.000 -0.720 0.527
H9 0.000 2.530 -0.647
H10 0.000 1.221 -2.790
H11 0.000 -1.221 -2.790
H12 0.000 -2.530 -0.647
H13 0.000 -1.443 2.807
H14 0.000 1.443 2.807

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 C7 C8 H9 H10 H11 H12 H13 H14
C11.44712.46282.89443.40842.77361.35682.45161.08282.18343.44033.97694.48273.4262
C21.44711.37212.46284.12733.89542.37662.76122.20121.08242.12663.43325.12074.7181
C32.46281.37211.44713.89544.12732.76122.37663.43322.12661.08242.20124.71815.1207
C42.89442.46281.44712.77363.40842.45161.35683.97693.44032.18341.08283.42624.4827
C53.40844.12733.89542.77361.35592.06461.51974.18805.19594.86683.26801.07972.2539
C62.77363.89544.12733.40841.35591.51972.06463.26804.86685.19594.18802.25391.0797
C71.35682.37662.76122.45162.06461.51971.44042.15673.35493.84353.45523.14372.3925
C82.45162.76122.37661.35681.51972.06461.44043.45523.84353.35492.15672.39253.1437
H91.08282.20123.43323.97694.18803.26802.15673.45522.51154.32005.05925.26473.6209
H102.18341.08242.12663.44035.19594.86683.35493.84352.51152.44214.32006.19965.6023
H113.44032.12661.08242.18344.86685.19593.84353.35494.32002.44212.51155.60236.1996
H123.97693.43322.20121.08283.26804.18803.45522.15675.05924.32002.51153.62095.2647
H134.48275.12074.71813.42621.07972.25393.14372.39255.26476.19965.60233.62092.8870
H143.42624.71815.12074.48272.25391.07972.39253.14373.62095.60236.19965.26472.8870

picture of benzocyclobutadiene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 121.736 C1 C2 H10 118.643
C1 C7 C6 149.196 C1 C7 N8 122.398
C2 C1 C7 115.866 C2 C1 H9 120.252
C2 C3 C4 121.736 C2 C3 H11 119.621
C3 C2 H10 119.621 C3 C4 N8 115.866
C3 C4 H12 120.252 C4 C3 H11 118.643
C4 N8 C5 149.196 C4 N8 C7 122.398
C5 C6 C7 91.594 C5 C6 H14 135.154
C5 N8 C7 88.406 C6 C5 N8 91.594
C6 C5 H13 135.154 C6 C7 N8 88.406
C7 C1 H9 123.882 C7 C6 H14 133.252
N8 C4 H12 123.882 N8 C5 H13 133.252
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability