Geometry Comparison
CH2Br2 (dibromomethane)
distance is atom 1 (C) to atom 4 (Br)
Experimental bond length is 1.925 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 |
1.912 |
| PM6 |
1.935 |
| composite |
G2 |
1.930 |
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 |
cc-pVQZ |
aug-cc-pVDZ |
aug-cc-pVTZ |
| hartree fock |
HF |
|
1.977 |
1.936 |
1.966 |
1.929 |
1.929 |
1.927 |
1.929 |
1.928 |
1.908 |
1.925 |
1.932 |
1.931 |
1.926 |
1.924 |
1.931 |
1.926 |
| density functional |
LSDA |
1.922 |
1.954 |
1.919 |
1.954 |
1.917 |
1.916 |
1.915 |
1.919 |
1.919 |
1.892 |
|
|
1.919 |
1.912 |
|
1.920 |
|
| SVWN |
|
1.954 |
|
|
1.917 |
|
1.914 |
|
|
|
|
|
|
|
|
|
|
| BLYP |
|
2.010 |
1.974 |
2.016 |
1.975 |
1.974 |
1.973 |
1.977 |
1.977 |
1.948 |
|
|
1.977 |
1.971 |
|
1.977 |
|
| B1B95 |
1.926 |
1.969 |
1.932 |
1.965 |
1.925 |
1.927 |
1.925 |
1.929 |
1.929 |
1.904 |
|
|
1.929 |
1.922 |
|
1.927 |
|
| B3LYP |
1.942 |
1.988 |
1.951 |
1.989 |
1.950 |
1.949 |
1.947 |
1.951 |
1.951 |
1.925 |
|
1.952 |
1.951 |
1.945 |
|
1.951 |
1.946 |
| B3PW91 |
|
1.975 |
1.939 |
1.972 |
1.935 |
1.934 |
1.932 |
1.936 |
1.936 |
1.910 |
|
|
1.936 |
1.930 |
|
1.935 |
|
| mPW1PW91 |
1.923 |
1.970 |
1.933 |
1.966 |
1.929 |
1.929 |
1.927 |
1.930 |
1.930 |
1.905 |
|
|
1.930 |
1.925 |
|
1.930 |
|
| M06-2X |
|
|
|
|
1.927 |
|
|
|
|
|
|
|
|
|
|
|
|
| PBEPBE |
|
1.988 |
1.951 |
1.989 |
1.948 |
1.947 |
1.945 |
1.951 |
1.950 |
1.922 |
|
|
1.949 |
1.944 |
|
1.949 |
1.944 |
| PBEPBEultrafine |
|
|
|
|
1.949 |
|
|
|
|
|
|
|
|
|
|
|
|
| HSEh1PBE |
|
|
|
|
1.929 |
|
|
|
|
|
|
|
|
|
|
|
|
| Moller Plesset perturbation |
MP2FC |
|
1.996 |
1.951 |
1.991 |
1.941 |
1.938 |
1.936 |
1.932 |
1.930 |
1.906 |
|
1.932 |
1.934 |
|
|
1.935 |
|
| MP2FU |
|
1.996 |
1.951 |
1.989 |
1.936 |
1.934 |
1.932 |
1.929 |
1.926 |
1.889 |
|
|
1.932 |
|
|
|
|
| MP3 |
|
|
|
|
1.944 |
|
|
|
|
|
|
|
|
|
|
|
|
| MP4 |
|
2.009 |
|
|
1.952 |
|
|
|
|
|
|
|
|
|
|
|
|
| B2PLYP |
|
|
|
|
1.945 |
|
1.942 |
|
|
|
|
|
|
|
|
|
|
| Configuration interaction |
CID |
|
1.993 |
1.946 |
1.986 |
1.935 |
|
|
1.928 |
1.926 |
|
|
|
|
|
|
|
|
| CISD |
|
1.996 |
1.947 |
1.990 |
1.936 |
|
|
1.930 |
1.928 |
|
|
|
|
|
|
|
|
| Quadratic configuration interaction |
QCISD |
|
2.006 |
1.958 |
2.002 |
1.948 |
1.945 |
1.943 |
1.939 |
1.937 |
1.913 |
|
|
1.942 |
|
|
|
|
| QCISD(T) |
|
|
|
|
1.952 |
|
|
|
|
|
|
|
|
|
|
|
|
| Coupled Cluster |
CCD |
|
2.001 |
1.955 |
1.995 |
1.944 |
1.942 |
1.940 |
1.936 |
1.933 |
1.910 |
|
|
1.939 |
|
|
|
|
| CCSD |
|
|
|
|
1.946 |
|
|
|
|
|
|
|
|
|
|
|
|
| CCSD(T) |
|
|
|
|
1.951 |
|
|
|
|
|
|
|
|
|
|
|
|
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 |
1.973 |
|
1.970 |
|
1.989 |
1.973 |
| density functional |
B1B95 |
1.984 |
|
|
|
|
|
| B3LYP |
2.005 |
|
2.002 |
|
2.011 |
1.998 |
| Moller Plesset perturbation |
MP2FC |
2.008 |
|
2.005 |
|
2.019 |
2.006 |
Values that are outliers may reflect different atom numbering for
different levels of theory.
Please use the error
report form to report problems.
