return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for C8H6 (benzocyclobutadiene)

using model chemistry: BLYP/TZVP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at BLYP/TZVP
 hartrees
Energy at 0K-308.326979
Energy at 298.15K-308.332363
HF Energy-308.326979
Nuclear repulsion energy310.611024
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 BLYP/TZVP
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 3162 3154 11.89      
2 A1 3117 3109 17.44      
3 A1 3101 3093 8.93      
4 A1 1629 1625 2.22      
5 A1 1504 1500 4.20      
6 A1 1437 1434 1.51      
7 A1 1395 1392 8.71      
8 A1 1165 1162 0.00      
9 A1 1059 1056 0.01      
10 A1 1037 1035 0.77      
11 A1 947 944 4.43      
12 A1 786 784 0.20      
13 A1 534 533 0.23      
14 A2 900 898 0.00      
15 A2 877 875 0.00      
16 A2 838 836 0.00      
17 A2 739 737 0.00      
18 A2 549 547 0.00      
19 A2 286 286 0.00      
20 B1 865 863 9.59      
21 B1 717 715 109.42      
22 B1 685 684 3.49      
23 B1 349 348 2.18      
24 B1 215 214 11.56      
25 B2 3134 3126 3.04      
26 B2 3108 3100 35.35      
27 B2 3091 3083 0.07      
28 B2 1576 1572 0.07      
29 B2 1417 1414 3.58      
30 B2 1272 1269 2.00      
31 B2 1218 1215 13.14      
32 B2 1061 1059 2.73      
33 B2 1023 1020 0.84      
34 B2 842 840 0.22      
35 B2 641 640 0.72      
36 B2 403 402 4.07      

Unscaled Zero Point Vibrational Energy (zpe) 23339.4 cm-1
Scaled (by 0.9975) Zero Point Vibrational Energy (zpe) 23281.1 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 BLYP/TZVP
ABC
0.15969 0.07227 0.04975

See section I.F.4 to change rotational constant units
Geometric Data calculated at BLYP/TZVP

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 1.449 -0.623
C2 0.000 0.689 -1.857
C3 0.000 -0.689 -1.857
C4 0.000 -1.449 -0.623
C5 0.000 -0.680 2.055
C6 0.000 0.680 2.055
C7 0.000 0.722 0.531
C8 0.000 -0.722 0.531
H9 0.000 2.539 -0.653
H10 0.000 1.231 -2.804
H11 0.000 -1.231 -2.804
H12 0.000 -2.539 -0.653
H13 0.000 -1.452 2.820
H14 0.000 1.452 2.820

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 C7 C8 H9 H10 H11 H12 H13 H14
C11.44922.46892.89733.42102.78641.36362.45871.09072.19153.45513.98764.50173.4427
C21.44921.37902.46894.14543.91272.38872.77462.20691.09042.14133.44575.14414.7389
C32.46891.37901.44923.91274.14542.77462.38873.44572.14131.09042.20694.73895.1441
C42.89732.46891.44922.78643.42102.45871.36363.98763.45512.19151.09073.44274.5017
C53.42104.14543.91272.78641.35972.07101.52484.20665.22124.89013.28511.08662.2647
C62.78643.91274.14543.42101.35971.52482.07103.28514.89015.22124.20662.26471.0866
C71.36362.38872.77462.45872.07101.52481.44472.16853.37333.86493.46963.15682.4022
C82.45872.77462.38871.36361.52482.07101.44473.46963.86493.37332.16852.40223.1568
H91.09072.20693.44573.98764.20663.28512.16853.46962.51684.34045.07785.29043.6391
H102.19151.09042.14133.45515.22124.89013.37333.86492.51682.46274.34046.23085.6277
H113.45512.14131.09042.19154.89015.22123.86493.37334.34042.46272.51685.62776.2308
H123.98763.44572.20691.09073.28514.20663.46962.16855.07784.34042.51683.63915.2904
H134.50175.14414.73893.44271.08662.26473.15682.40225.29046.23085.62773.63912.9039
H143.44274.73895.14414.50172.26471.08662.40223.15683.63915.62776.23085.29042.9039

picture of benzocyclobutadiene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 121.590 C1 C2 H10 118.612
C1 C7 C6 149.414 C1 C7 N8 122.184
C2 C1 C7 116.227 C2 C1 H9 120.002
C2 C3 C4 121.590 C2 C3 H11 119.798
C3 C2 H10 119.798 C3 C4 N8 116.227
C3 C4 H12 120.002 C4 C3 H11 118.612
C4 N8 C5 149.414 C4 N8 C7 122.184
C5 C6 C7 91.598 C5 C6 H14 135.283
C5 N8 C7 88.402 C6 C5 N8 91.598
C6 C5 H13 135.283 C6 C7 N8 88.402
C7 C1 H9 123.771 C7 C6 H14 133.119
N8 C4 H12 123.771 N8 C5 H13 133.119
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/TZVP Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.079      
2 C -0.104      
3 C -0.104      
4 C -0.079      
5 C -0.157      
6 C -0.157      
7 C 0.022      
8 C 0.022      
9 H 0.105      
10 H 0.098      
11 H 0.098      
12 H 0.105      
13 H 0.116      
14 H 0.116      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 0.634 0.634
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -51.329 0.000 0.000
y 0.000 -41.977 0.000
z 0.000 0.000 -41.563
Traceless
 xyz
x -9.559 0.000 0.000
y 0.000 4.469 0.000
z 0.000 0.000 5.090
Polar
3z2-r210.179
x2-y2-9.352
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.971 0.000 0.000
y 0.000 14.426 0.000
z 0.000 0.000 17.802


<r2> (average value of r2) Å2
<r2> 223.660
(<r2>)1/2 14.955