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All results from a given calculation for C8H6 (benzocyclobutadiene)

using model chemistry: MP2/CEP-121G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at MP2/CEP-121G
 hartrees
Energy at 0K-47.846946
Energy at 298.15K 
HF Energy-47.158580
Nuclear repulsion energy149.561901
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 MP2/CEP-121G
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 3187 3111 25.67      
2 A1 3151 3076 27.52      
3 A1 3131 3056 17.98      
4 A1 1633 1594 0.57      
5 A1 1459 1424 0.00      
6 A1 1443 1408 14.18      
7 A1 1401 1368 5.25      
8 A1 1191 1163 0.00      
9 A1 1078 1052 0.02      
10 A1 1060 1034 0.84      
11 A1 950 927 3.09      
12 A1 776 757 0.04      
13 A1 530 517 0.01      
14 A2 746 728 0.00      
15 A2 676 660 0.00      
16 A2 569 555 0.00      
17 A2 226 221 0.00      
18 A2 580i 566i 0.00      
19 A2 1301i 1270i 0.00      
20 B1 661 646 121.41      
21 B1 583 569 51.42      
22 B1 541 528 13.20      
23 B1 236 230 7.99      
24 B1 214i 208i 0.26      
25 B2 3154 3078 7.71      
26 B2 3141 3066 56.71      
27 B2 3116 3041 0.00      
28 B2 1595 1557 0.90      
29 B2 1433 1399 3.77      
30 B2 1288 1257 1.58      
31 B2 1233 1203 14.41      
32 B2 1083 1057 1.41      
33 B2 1028 1003 0.84      
34 B2 846 825 0.29      
35 B2 647 631 1.88      
36 B2 389 380 3.60      

Unscaled Zero Point Vibrational Energy (zpe) 21042.3 cm-1
Scaled (by 0.976) Zero Point Vibrational Energy (zpe) 20537.3 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 MP2/CEP-121G
ABC
0.15289 0.06980 0.04792

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-121G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 1.481 -0.635
C2 0.000 0.705 -1.890
C3 0.000 -0.705 -1.890
C4 0.000 -1.481 -0.635
C5 0.000 -0.698 2.094
C6 0.000 0.698 2.094
C7 0.000 0.738 0.539
C8 0.000 -0.738 0.539
H9 0.000 2.575 -0.665
H10 0.000 1.248 -2.840
H11 0.000 -1.248 -2.840
H12 0.000 -2.575 -0.665
H13 0.000 -1.472 2.862
H14 0.000 1.472 2.862

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 C7 C8 H9 H10 H11 H12 H13 H14
C11.47482.52042.96173.49262.83961.38922.51041.09462.21723.50854.05604.57713.4971
C21.47481.41042.52044.22393.98402.42862.82502.23511.09472.17243.50135.22664.8130
C32.52041.41041.47483.98404.22392.82502.42863.50132.17241.09472.23514.81305.2266
C42.96172.52041.47482.83963.49262.51041.38924.05603.50852.21721.09463.49714.5771
C53.49264.22393.98402.83961.39612.11721.55614.28125.30454.96513.33741.09002.3019
C62.83963.98404.22393.49261.39611.55612.11723.33744.96515.30454.28122.30191.0900
C71.38922.42862.82502.51042.11721.55611.47632.19643.41733.91963.52523.20652.4362
C82.51042.82502.42861.38921.55612.11721.47633.52523.91963.41732.19642.43623.2065
H91.09462.23513.50134.05604.28123.33742.19643.52522.54784.39865.15015.36843.6955
H102.21721.09472.17243.50855.30454.96513.41733.91962.54782.49634.39866.31775.7065
H113.50852.17241.09472.21724.96515.30453.91963.41734.39862.49632.54785.70656.3177
H124.05603.50132.23511.09463.33744.28123.52522.19645.15014.39862.54783.69555.3684
H134.57715.22664.81303.49711.09002.30193.20652.43625.36846.31775.70653.69552.9442
H143.49714.81305.22664.57712.30191.09002.43623.20653.69555.70656.31775.36842.9442

picture of benzocyclobutadiene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 121.730 C1 C2 H10 118.537
C1 C7 C6 149.159 C1 C7 N8 122.317
C2 C1 C7 115.953 C2 C1 H9 120.160
C2 C3 C4 121.730 C2 C3 H11 119.733
C3 C2 H10 119.733 C3 C4 N8 115.953
C3 C4 H12 120.160 C4 C3 H11 118.537
C4 N8 C5 149.159 C4 N8 C7 122.317
C5 C6 C7 91.476 C5 C6 H14 135.243
C5 N8 C7 88.524 C6 C5 N8 91.476
C6 C5 H13 135.243 C6 C7 N8 88.524
C7 C1 H9 123.888 C7 C6 H14 133.281
N8 C4 H12 123.888 N8 C5 H13 133.281
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability