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All results from a given calculation for C8H6 (benzocyclobutadiene)

using model chemistry: CID/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at CID/3-21G*
 hartrees
Energy at 0K-305.201334
Energy at 298.15K-305.207075
HF Energy-304.610277
Nuclear repulsion energy311.189476
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 CID/3-21G*
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 3369 3135 9.59      
2 A1 3299 3070 9.74      
3 A1 3280 3052 11.74      
4 A1 1759 1636 2.00      
5 A1 1618 1506 1.35      
6 A1 1519 1414 0.21      
7 A1 1494 1390 18.29      
8 A1 1283 1194 0.06      
9 A1 1138 1058 0.00      
10 A1 1103 1027 0.03      
11 A1 952 886 1.88      
12 A1 826 769 0.20      
13 A1 567 528 0.04      
14 A2 1013 943 0.00      
15 A2 939 873 0.00      
16 A2 915 851 0.00      
17 A2 691 643 0.00      
18 A2 591 550 0.00      
19 A2 308 287 0.00      
20 B1 961 894 11.17      
21 B1 797 741 118.71      
22 B1 745 693 28.11      
23 B1 373 347 2.07      
24 B1 231 215 15.39      
25 B2 3335 3103 0.27      
26 B2 3291 3062 19.97      
27 B2 3264 3037 0.31      
28 B2 1734 1613 0.01      
29 B2 1534 1427 7.97      
30 B2 1391 1294 0.21      
31 B2 1323 1231 13.55      
32 B2 1132 1053 2.73      
33 B2 1102 1026 0.72      
34 B2 902 839 0.03      
35 B2 701 652 0.57      
36 B2 413 384 4.30      

Unscaled Zero Point Vibrational Energy (zpe) 24944.9 cm-1
Scaled (by 0.9305) Zero Point Vibrational Energy (zpe) 23211.2 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 CID/3-21G*
ABC
0.16105 0.07216 0.04983

See section I.F.4 to change rotational constant units
Geometric Data calculated at CID/3-21G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 1.443 -0.622
C2 0.000 0.683 -1.855
C3 0.000 -0.683 -1.855
C4 0.000 -1.443 -0.622
C5 0.000 -0.675 2.063
C6 0.000 0.675 2.063
C7 0.000 0.723 0.518
C8 0.000 -0.723 0.518
H9 0.000 2.522 -0.650
H10 0.000 1.218 -2.793
H11 0.000 -1.218 -2.793
H12 0.000 -2.522 -0.650
H13 0.000 -1.436 2.821
H14 0.000 1.436 2.821

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 C7 C8 H9 H10 H11 H12 H13 H14
C11.44892.45762.88603.41972.79221.34772.44741.07952.18303.43423.96524.48763.4422
C21.44891.36542.45764.14663.91792.37292.75782.19921.07982.11923.42415.13334.7359
C32.45761.36541.44893.91794.14662.75782.37293.42412.11921.07982.19924.73595.1333
C42.88602.45761.44892.79223.41972.44741.34773.96523.43422.18301.07953.44224.4876
C53.41974.14663.91792.79221.35072.08411.54614.19305.21184.88613.28141.07372.2433
C62.79223.91794.14663.41971.35071.54612.08413.28144.88615.21184.19302.24331.0737
C71.34772.37292.75782.44742.08411.54611.44612.14453.34733.83753.44873.15692.4109
C82.44742.75782.37291.34771.54612.08411.44613.44873.83753.34732.14452.41093.1569
H91.07952.19923.42413.96524.19303.28142.14453.44872.50924.31055.04425.26403.6361
H102.18301.07982.11923.43425.21184.88613.34733.83752.50922.43534.31056.20925.6178
H113.43422.11921.07982.18304.88615.21183.83753.34734.31052.43532.50925.61786.2092
H123.96523.42412.19921.07953.28144.19303.44872.14455.04424.31052.50923.63615.2640
H134.48765.13334.73593.44221.07372.24333.15692.41095.26406.20925.61783.63612.8723
H143.44224.73595.13334.48762.24331.07372.41093.15693.63615.61786.20925.26402.8723

picture of benzocyclobutadiene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 121.652 C1 C2 H10 118.652
C1 C7 C6 149.478 C1 C7 N8 122.291
C2 C1 C7 116.058 C2 C1 H9 120.173
C2 C3 C4 121.652 C2 C3 H11 119.696
C3 C2 H10 119.696 C3 C4 N8 116.058
C3 C4 H12 120.173 C4 C3 H11 118.652
C4 N8 C5 149.478 C4 N8 C7 122.291
C5 C6 C7 91.769 C5 C6 H14 135.118
C5 N8 C7 88.231 C6 C5 N8 91.769
C6 C5 H13 135.118 C6 C7 N8 88.231
C7 C1 H9 123.770 C7 C6 H14 133.113
N8 C4 H12 123.770 N8 C5 H13 133.113
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability