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All results from a given calculation for C8H6 (benzocyclobutadiene)

using model chemistry: CBS-Q

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at CBS-Q
 hartrees
Energy at 0K-307.791728
Energy at 298.15K-307.785066
HF Energy-306.330908
Nuclear repulsion energy313.967771
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 CBS-Q
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 3428 3428 14.15      
2 A1 3372 3372 20.70      
3 A1 3353 3353 19.56      
4 A1 1864 1864 5.22      
5 A1 1737 1737 0.83      
6 A1 1615 1615 7.26      
7 A1 1553 1553 14.06      
8 A1 1278 1278 0.01      
9 A1 1181 1181 1.00      
10 A1 1159 1159 0.05      
11 A1 1003 1003 5.29      
12 A1 879 879 0.65      
13 A1 584 584 0.33      
14 A2 1078 1078 0.00      
15 A2 1035 1035 0.00      
16 A2 982 982 0.00      
17 A2 851 851 0.00      
18 A2 633 633 0.00      
19 A2 325 325 0.00      
20 B1 1010 1010 11.89      
21 B1 842 842 107.27      
22 B1 811 811 3.35      
23 B1 392 392 1.91      
24 B1 266 266 11.02      
25 B2 3396 3396 2.17      
26 B2 3364 3364 43.60      
27 B2 3337 3337 0.63      
28 B2 1832 1832 2.36      
29 B2 1576 1576 6.23      
30 B2 1419 1419 4.80      
31 B2 1370 1370 9.30      
32 B2 1165 1165 2.92      
33 B2 1131 1131 0.19      
34 B2 954 954 0.97      
35 B2 703 703 0.42      
36 B2 456 456 4.53      

Unscaled Zero Point Vibrational Energy (zpe) 25966.8 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 25966.8 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 CBS-Q
ABC
0.15914 0.07268 0.04989

See section I.F.4 to change rotational constant units
Geometric Data calculated at CBS-Q

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 1.432 -0.611
C2 0.000 0.677 -1.840
C3 0.000 -0.677 -1.840
C4 0.000 -1.432 -0.611
C5 0.000 -0.664 2.035
C6 0.000 0.664 2.035
C7 0.000 0.712 0.519
C8 0.000 -0.712 0.519
H9 0.000 2.509 -0.636
H10 0.000 1.209 -2.776
H11 0.000 -1.209 -2.776
H12 0.000 -2.509 -0.636
H13 0.000 -1.423 2.796
H14 0.000 1.423 2.796

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 C7 C8 H9 H10 H11 H12 H13 H14
C11.44292.44112.86493.37652.75591.34042.42411.07662.17633.41493.94134.44553.4073
C21.44291.35332.44114.10123.87582.35972.73772.19241.07632.10473.40545.08974.6961
C32.44111.35331.44293.87584.10122.73772.35973.40542.10471.07632.19244.69615.0897
C42.86492.44111.44292.75593.37652.42411.34043.94133.41492.17631.07663.40734.4455
C53.37654.10123.87582.75591.32862.04781.51714.14805.16314.84213.24641.07432.2215
C62.75593.87584.10123.37651.32861.51712.04783.24644.84215.16314.14802.22151.0743
C71.34042.35972.73772.42412.04781.51711.42392.13613.33233.81393.42163.12132.3854
C82.42412.73772.35971.34041.51712.04781.42393.42163.81393.33232.13612.38543.1213
H91.07662.19243.40543.94134.14803.24642.13613.42162.50384.28935.01755.21903.5999
H102.17631.07632.10473.41495.16314.84213.33233.81392.50382.41734.28936.16225.5762
H113.41492.10471.07632.17634.84215.16313.81393.33234.28932.41732.50385.57626.1622
H123.94133.40542.19241.07663.24644.14803.42162.13615.01754.28932.50383.59995.2190
H134.44555.08974.69613.40731.07432.22153.12132.38545.21906.16225.57623.59992.8459
H143.40734.69615.08974.44552.22151.07432.38543.12133.59995.57626.16225.21902.8459

picture of benzocyclobutadiene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 121.588 C1 C2 H10 118.789
C1 C7 C6 149.286 C1 C7 N8 122.515
C2 C1 C7 115.898 C2 C1 H9 120.261
C2 C3 C4 121.588 C2 C3 H11 119.623
C3 C2 H10 119.623 C3 C4 N8 115.898
C3 C4 H12 120.261 C4 C3 H11 118.789
C4 N8 C5 149.286 C4 N8 C7 122.515
C5 C6 C7 91.801 C5 C6 H14 134.925
C5 N8 C7 88.199 C6 C5 N8 91.801
C6 C5 H13 134.925 C6 C7 N8 88.199
C7 C1 H9 123.841 C7 C6 H14 133.274
N8 C4 H12 123.841 N8 C5 H13 133.274
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability