Geometry Comparison
C6H6 (Fulvene)
distance is atom 3 (C) to atom 5 (C)
Experimental bond length is 1.355 Å
original data displayed. press to display differences
differences displayed. press to display original data
Calculated bond length in Å
Methods with predefined basis sets
| semi-empirical |
PM3 |
1.355 |
| PM6 |
1.354 |
| composite |
G2 |
1.332 |
| G3 |
1.332 |
Calculated bond length in Å
Methods with standard basis sets
|
|
STO-3G |
3-21G |
3-21G* |
6-31G |
6-31G* |
6-31G** |
6-31+G** |
6-311G* |
6-311G** |
6-31G(2df,p) |
6-311+G(3df,2p) |
TZVP |
cc-pVDZ |
cc-pVTZ |
aug-cc-pVDZ |
aug-cc-pVTZ |
| hartree fock |
HF |
1.324 |
1.334 |
1.334 |
1.339 |
1.333 |
1.332 |
|
1.332 |
1.332 |
|
1.330 |
1.330 |
1.337 |
1.329 |
1.338 |
1.330 |
| density functional |
LSDA |
1.359 |
1.356 |
1.356 |
1.360 |
1.354 |
1.354 |
1.357 |
1.350 |
1.350 |
1.351 |
|
|
1.358 |
1.348 |
1.359 |
|
| SVWN |
|
1.356 |
|
|
1.354 |
|
1.357 |
|
|
|
|
|
|
|
|
|
| BLYP |
|
1.367 |
1.367 |
1.371 |
1.365 |
1.365 |
1.369 |
1.362 |
1.362 |
|
|
|
1.369 |
1.359 |
|
|
| B3LYP |
|
|
1.355 |
1.359 |
|
1.353 |
1.356 |
1.351 |
|
|
|
1.349 |
1.357 |
1.348 |
1.358 |
|
| B3PW91 |
1.355 |
1.355 |
1.355 |
1.358 |
1.353 |
1.352 |
1.355 |
1.350 |
|
|
|
|
1.356 |
1.347 |
|
|
| mPW1PW91 |
1.352 |
1.353 |
1.353 |
|
1.350 |
1.350 |
1.353 |
1.348 |
1.348 |
|
|
|
1.353 |
1.345 |
|
|
| M06-2X |
|
|
|
|
1.347 |
|
|
|
|
|
|
|
|
|
|
|
| PBEPBE |
1.368 |
1.367 |
1.367 |
1.369 |
1.364 |
1.363 |
1.366 |
1.361 |
1.361 |
|
|
|
1.366 |
1.358 |
|
|
| PBEPBEultrafine |
|
|
|
|
1.364 |
|
|
|
|
|
|
|
|
|
|
|
| HSEh1PBE |
|
|
|
|
1.351 |
|
|
|
|
|
|
|
|
|
|
|
| Moller Plesset perturbation |
MP2FC |
1.366 |
1.366 |
1.366 |
1.374 |
|
1.359 |
1.363 |
1.362 |
1.362 |
|
|
1.357 |
1.370 |
1.358 |
1.374 |
|
| MP2FU |
1.366 |
1.366 |
1.366 |
1.374 |
1.358 |
1.358 |
1.362 |
1.361 |
|
|
|
|
1.369 |
1.353 |
|
|
| MP3 |
|
|
|
|
1.351 |
|
|
|
|
|
|
|
|
|
|
|
| MP4 |
1.368 |
1.368 |
|
|
1.362 |
|
|
|
|
|
|
|
|
|
|
|
| B2PLYP |
|
|
|
|
1.355 |
|
1.358 |
|
|
|
|
|
|
|
|
|
| Configuration interaction |
CID |
|
1.347 |
|
|
1.340 |
|
|
|
|
|
|
|
|
|
|
|
| CISD |
|
1.348 |
|
|
1.340 |
|
|
|
|
|
|
|
|
|
|
|
| Quadratic configuration interaction |
QCISD |
1.368 |
1.362 |
|
1.369 |
1.353 |
1.353 |
1.356 |
1.355 |
1.355 |
|
|
|
1.363 |
|
|
|
| QCISD(T) |
|
|
|
|
1.361 |
|
|
|
|
|
|
|
|
|
|
|
| Coupled Cluster |
CCD |
1.367 |
1.359 |
|
1.367 |
1.351 |
1.351 |
1.354 |
1.353 |
|
|
|
|
1.361 |
|
|
|
| CCSD(T) |
|
|
|
|
1.360 |
|
|
|
|
|
|
|
|
|
|
|
Calculated bond length in Å
Methods with effective core potentials (select basis sets)
|
|
CEP-31G |
CEP-31G* |
CEP-121G |
CEP-121G* |
LANL2DZ |
SDD |
| hartree fock |
HF |
1.364 |
1.356 |
1.352 |
1.340 |
1.349 |
1.348 |
| density functional |
B3LYP |
1.385 |
1.379 |
1.374 |
1.363 |
1.369 |
1.369 |
| Moller Plesset perturbation |
MP2FC |
1.407 |
1.388 |
1.391 |
1.371 |
1.388 |
1.388 |
Values that are outliers may reflect different atom numbering for
different levels of theory.
Please use the error
report form to report problems.
