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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-305.207094
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 3139 9.59      
2 A1 3299 3074 9.74      
3 A1 3280 3056 11.74      
4 A1 1759 1638 2.00      
5 A1 1618 1507 1.35      
6 A1 1519 1415 0.21      
7 A1 1494 1392 18.29      
8 A1 1283 1195 0.06      
9 A1 1138 1060 0.00      
10 A1 1103 1028 0.03      
11 A1 952 887 1.88      
12 A1 826 769 0.20      
13 A1 567 529 0.04      
14 A2 1013 944 0.00      
15 A2 939 874 0.00      
16 A2 915 852 0.00      
17 A2 691 644 0.00      
18 A2 591 551 0.00      
19 A2 308 287 0.00      
20 B1 961 895 11.17      
21 B1 797 742 118.71      
22 B1 745 694 28.11      
23 B1 373 348 2.07      
24 B1 231 215 15.39      
25 B2 3335 3107 0.27      
26 B2 3291 3066 19.97      
27 B2 3264 3041 0.31      
28 B2 1734 1615 0.01      
29 B2 1534 1429 7.97      
30 B2 1391 1296 0.21      
31 B2 1323 1232 13.55      
32 B2 1132 1054 2.73      
33 B2 1102 1027 0.72      
34 B2 902 840 0.03      
35 B2 701 653 0.57      
36 B2 413 385 4.30      

Unscaled Zero Point Vibrational Energy (zpe) 24944.9 cm-1
Scaled (by 0.9316) Zero Point Vibrational Energy (zpe) 23238.7 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