Geometry Comparison
C2H4F2 (1,2-difluoroethane)
distance is atom 1 (C) to atom 2 (C)
Experimental bond length is 1.493 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 |
PM6 |
1.550 |
| composite |
G2 |
1.504 |
| G3 |
1.504 |
| G3B3 |
1.509 |
| CBS-Q |
1.506 |
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* |
TZVP |
cc-pVDZ |
cc-pVTZ |
cc-pVQZ |
aug-cc-pVDZ |
aug-cc-pVTZ |
| hartree fock |
HF |
|
1.507 |
1.507 |
1.497 |
1.504 |
1.503 |
1.503 |
1.501 |
1.503 |
1.501 |
1.502 |
1.502 |
1.503 |
1.502 |
| density functional |
LSDA |
1.589 |
1.509 |
1.509 |
|
|
|
|
|
|
|
|
|
|
|
| BLYP |
|
1.529 |
1.529 |
1.516 |
1.521 |
1.520 |
1.517 |
1.515 |
|
1.519 |
1.512 |
|
|
|
| B1B95 |
|
1.508 |
1.508 |
1.498 |
1.503 |
1.502 |
1.501 |
1.498 |
|
1.499 |
1.497 |
|
1.499 |
|
| B3LYP |
|
1.515 |
1.515 |
1.505 |
1.510 |
1.509 |
1.507 |
1.505 |
1.504 |
1.507 |
1.503 |
1.503 |
1.506 |
1.503 |
| B3LYPultrafine |
|
|
|
|
1.510 |
|
|
|
|
|
|
|
|
|
| B3PW91 |
|
1.512 |
1.512 |
1.502 |
1.506 |
1.506 |
1.504 |
1.501 |
|
1.504 |
1.500 |
|
|
|
| mPW1PW91 |
|
1.509 |
1.509 |
1.499 |
1.504 |
1.503 |
1.502 |
1.499 |
|
1.501 |
1.498 |
|
|
|
| PBEPBE |
|
1.521 |
1.521 |
1.508 |
1.513 |
1.512 |
1.510 |
1.507 |
|
1.510 |
1.506 |
|
1.508 |
|
| PBEPBEultrafine |
|
|
|
|
1.513 |
|
|
|
|
|
|
|
|
|
| Moller Plesset perturbation |
MP2FC |
|
1.520 |
1.520 |
1.513 |
1.503 |
1.502 |
1.501 |
1.503 |
1.501 |
1.508 |
1.499 |
|
1.507 |
1.499 |
| MP2FU |
|
1.519 |
1.519 |
1.512 |
1.501 |
1.500 |
1.499 |
1.501 |
|
1.507 |
1.492 |
|
|
|
| MP3 |
|
|
|
|
1.505 |
|
|
|
|
|
|
|
|
|
| MP4 |
|
1.527 |
|
|
1.507 |
|
|
|
|
|
|
|
|
|
| Configuration interaction |
CID |
|
1.517 |
1.517 |
1.510 |
1.501 |
|
|
1.500 |
|
|
|
|
|
|
| CISD |
|
1.517 |
1.517 |
1.510 |
1.501 |
|
|
1.500 |
|
|
|
|
|
|
| Quadratic configuration interaction |
QCISD |
|
1.526 |
1.526 |
1.518 |
1.506 |
1.505 |
1.505 |
1.507 |
|
1.512 |
1.503 |
|
|
|
| QCISD(T) |
|
1.527 |
|
|
1.507 |
|
|
|
|
1.514 |
|
|
|
|
| Coupled Cluster |
CCD |
|
1.524 |
1.524 |
1.517 |
1.506 |
1.505 |
1.505 |
1.507 |
|
1.512 |
1.503 |
|
|
|
| CCSD |
|
1.525 |
|
|
1.506 |
|
|
|
|
1.512 |
|
|
|
|
| CCSD(T) |
|
1.527 |
|
|
1.507 |
|
|
|
|
1.514 |
|
|
|
|
| CCSD(T)=FULL |
|
|
|
|
1.506 |
|
|
|
|
|
|
|
|
|
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 |
1.520 |
|
1.514 |
|
1.507 |
1.507 |
| density functional |
B3LYP |
1.531 |
|
1.521 |
|
1.514 |
1.514 |
| Moller Plesset perturbation |
MP2FC |
1.542 |
|
1.531 |
|
1.528 |
1.527 |
Values that are outliers may reflect different atom numbering for
different levels of theory.
Please use the error
report form to report problems.
