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Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology |
You are here: Comparisons > Energy > Similar molecules > Isomers OR FAQ Help > List > Similar molecules > Isomers |
index | Species | CAS number | Name | Relative experimental enthalpy (kJ mol-1) | sketch |
---|---|---|---|---|---|
a | C7H16 | 591764 | 2-methylhexane | 0.0 | ![]() |
b | C7H16 | 589344 | 3-methylhexane | 2.7 | ![]() |
c | C7H16 | 142825 | heptane | 7.2 | ![]() |
semi-empirical | AM1 | 374.9 b -789.5 c |
---|---|---|
PM3 | 0.0 a 3.2 b 0.3 c |
|
PM6 | 352.3 b |
|
composite | G1 | 0.0 a 614.1 b 7.5 c |
G2MP2 | 0.0 a 614.2 b 7.4 c |
|
G2 | 0.0 a 537.1 b 7.4 c |
|
G3 | 0.0 a 537.1 b 6.9 c |
|
G3B3 | 0.0 a -72.7 b 7.7 c |
|
G3MP2 | 0.0 a 615.2 b 7.0 c |
|
G4 | 0.0 a 4.9 b 8.0 c |
|
CBS-Q | 0.0 a |
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 | cc-pV(T+d)Z | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hartree fock | HF | 0.0 a 5.3 b -3.1 c |
0.0 a 5.1 b 2.1 c |
0.0 a 2.1 c |
0.0 a 5.7 b -1.7 c |
0.0 a -2.8 c |
0.0 a 6.1 b -2.7 c |
0.0 a 6.3 b -2.5 c |
0.0 a 6.3 b -2.7 c |
0.0 a 6.1 b -2.5 c |
0.0 a 6.1 b -3.0 c |
0.0 a -2.7 c |
0.0 a 6.3 b -2.6 c |
0.0 a 6.2 b -2.9 c |
0.0 a 6.4 b -3.2 c |
0.0 a 6.3 b -2.7 c |
0.0 a 6.4 b |
0.0 a -3.2 c |
density functional | LSDA | 0.0 a 0.9 b |
0.0 a -0.2 b |
0.0 a | 0.0 a 0.7 b |
0.0 a 1.1 b |
0.0 a 0.8 b |
0.0 a 1.4 b |
0.0 a 1.3 b |
0.0 a 1.0 b |
0.0 a 0.8 b |
0.0 a 1.1 b |
0.0 a 1.2 b |
0.0 a | 0.0 a | |||
BLYP | 0.0 a 3.8 b |
0.0 a 4.0 b 1.7 c |
0.0 a 1.7 c |
0.0 a 4.5 b -0.6 c |
0.0 a 4.7 b -1.1 c |
0.0 a 4.6 b -1.0 c |
0.0 a 5.1 b -1.2 c |
0.0 a 5.2 b -1.6 c |
0.0 a 5.0 b -1.1 c |
0.0 a 4.6 b -0.5 c |
0.0 a 5.0 b -1.0 c |
NC NC |
NC |
|||||
B1B95 | 0.0 a 12.8 b 8.0 c |
0.0 a 2.2 b 6.1 c |
0.0 a 6.1 c |
0.0 a 3.2 b -1.0 c |
0.0 a 3.5 b 0.9 c |
0.0 a 3.4 b 2.2 c |
0.0 a 3.7 b 1.6 c |
0.0 a 3.5 b 0.9 c |
0.0 a 3.4 b 1.2 c |
NC NC |
0.0 a 3.8 b 2.7 c |
0.0 a 3.7 b 1.0 c |
NC |
0.0 a 1.0 c |
||||
B3LYP | 0.0 a 3.7 b -1.1 c |
0.0 a 3.8 b 2.8 c |
0.0 a 2.8 c |
0.0 a 4.4 b -0.1 c |
0.0 a 4.6 b -0.7 c |
0.0 a 4.5 b -0.5 c |
0.0 a 4.9 b -0.6 c |
0.0 a 5.0 b -0.8 c |
0.0 a 4.8 b -0.3 c |
0.0 a 4.5 b -0.2 c |
0.0 a 4.9 b -0.5 c |
0.0 a 4.9 b -0.6 c |
0.0 a 5.0 b -0.8 c |
0.0 a 0.1 c |
0.0 a 5.0 b -0.7 c |
0.0 a -0.8 c |
||
B3LYPultrafine | 0.0 a 4.6 b |
NC |
0.0 a 4.9 b -0.9 c |
|||||||||||||||
B3PW91 | 0.0 a 4.2 b |
0.0 a 3.7 b 3.6 c |
0.0 a 3.6 c |
0.0 a 4.3 b -0.0 c |
0.0 a 4.5 b -0.7 c |
0.0 a 4.4 b -0.4 c |
0.0 a 4.7 b -0.3 c |
0.0 a 4.7 b -0.4 c |
0.0 a 4.5 b 0.1 c |
0.0 a 4.4 b -0.4 c |
0.0 a 4.7 b -0.6 c |
0.0 a 4.7 b -0.7 c |
0.0 a -0.7 c |
|||||
mPW1PW91 | 0.0 a 3.9 b -1.3 c |
0.0 a 3.3 b 11.3 c |
0.0 a 11.3 c |
0.0 a 4.0 b 7.4 c |
0.0 a 4.2 b 6.6 c |
0.0 a 4.1 b 6.8 c |
0.0 a 4.4 b 6.8 c |
0.0 a 4.4 b 6.8 c |
0.0 a 4.2 b 0.8 c |
0.0 a 4.1 b 0.3 c |
0.0 a 4.4 b 6.9 c |
0.0 a 4.5 b 6.4 c |
0.0 a 6.4 c |
|||||
M06-2X | 0.0 a 1.0 b 15.9 c |
0.0 a 2.4 b 5.8 c |
||||||||||||||||
PBEPBE | 0.0 a 3.3 b |
0.0 a 2.9 b 4.9 c |
0.0 a 4.9 c |
0.0 a 3.5 b 1.6 c |
0.0 a 3.8 b 1.0 c |
0.0 a 3.6 b 1.2 c |
0.0 a 4.1 b 1.2 c |
0.0 a 4.1 b 1.0 c |
0.0 a 3.9 b 1.6 c |
0.0 a 3.7 b 1.4 c |
0.0 a 4.0 b 1.1 c |
0.0 a 4.2 b 1.0 c |
0.0 a 1.0 c |
|||||
PBEPBEultrafine | NC |
|||||||||||||||||
PBE1PBE | 0.0 a 4.0 b 0.9 c |
|||||||||||||||||
HSEh1PBE | 0.0 a 3.0 b 5.5 c |
NC NC |
0.0 a 4.1 b 1.4 c |
0.0 a 4.1 b 1.0 c |
||||||||||||||
TPSSh | 0.0 a -0.1 c |
0.0 a 4.2 b 0.3 c |
0.0 a 3.9 b 0.2 c |
0.0 a -0.2 c |
||||||||||||||
wB97X-D | 0.0 a 1.8 b 6.4 c |
0.0 a 2.8 b 3.1 c |
0.0 a 3.0 b 3.3 c |
0.0 a 2.6 b 3.8 c |
0.0 a 3.0 b 3.4 c |
0.0 a 3.1 b 3.4 c |
0.0 a 3.0 b 2.8 c |
0.0 a 3.0 b 2.9 c |
||||||||||
B97D3 | 0.0 a 2.3 b 7.2 c |
0.0 a 2.8 b 3.5 c |
0.0 a 3.1 b 3.8 c |
0.0 a 2.9 b 4.0 c |
0.0 a 3.1 b 4.1 c |
0.0 a 3.1 b 3.7 c |
0.0 a 3.1 b 3.5 c |
0.0 a 3.1 b 3.7 c |
||||||||||
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 | cc-pV(T+d)Z | ||
Moller Plesset perturbation | MP2 | 0.0 a | 0.0 a 2.8 b 8.0 c |
0.0 a 8.0 c |
0.0 a 5.3 c |
0.0 a 3.8 b 5.7 c |
0.0 a 5.9 c |
0.0 a | 0.0 a 3.7 b 7.4 c |
0.0 a 7.5 c |
0.0 a 7.7 c |
0.0 a 3.0 b 8.2 c |
0.0 a 6.5 c |
NC |
0.0 a 9.0 c |
NC |
||
MP2=FULL | 0.0 a | 0.0 a 2.8 b 8.2 c |
0.0 a 8.2 c |
0.0 a 5.4 c |
0.0 a 3.7 b 6.1 c |
0.0 a 6.2 c |
0.0 a 7.2 c |
0.0 a 7.6 c |
0.0 a 7.8 c |
0.0 a 10.2 c |
0.0 a 6.8 c |
|||||||
MP3 | NC |
|||||||||||||||||
MP3=FULL | 0.0 a 3.7 c |
0.0 a 4.5 c |
||||||||||||||||
MP4 | NC |
|||||||||||||||||
B2PLYP | NC NC |
0.0 a 4.1 b 2.2 c |
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Configuration interaction | CID | 0.0 a | 0.0 a | 0.0 a | 0.0 a | 0.0 a | ||||||||||||
CISD | 0.0 a | 0.0 a | 0.0 a | 0.0 a | 0.0 a | |||||||||||||
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 | cc-pV(T+d)Z | ||
Quadratic configuration interaction | QCISD | 0.0 a | 0.0 a 6.5 c |
0.0 a 6.5 c |
0.0 a 3.7 c |
0.0 a 3.3 c |
0.0 a 3.3 c |
NC |
NC |
|||||||||
Coupled Cluster | CCD | 0.0 a | 0.0 a 6.4 c |
NC |
NC |
0.0 a 3.1 c |
NC |
NC |
||||||||||
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 | cc-pV(T+d)Z |
CEP-31G | CEP-31G* | CEP-121G | CEP-121G* | LANL2DZ | SDD | cc-pVTZ-PP | aug-cc-pVTZ-PP | Def2TZVPP | ||
---|---|---|---|---|---|---|---|---|---|---|
hartree fock | HF | 0.0 a 5.8 b -0.5 c |
0.0 a 6.3 b -0.7 c |
0.0 a 5.9 b -1.8 c |
0.0 a 6.4 b -2.2 c |
0.0 a 5.6 b -1.7 c |
0.0 a 5.6 b -1.6 c |
0.0 a 6.4 b -3.2 c |
||
density functional | B1B95 | 0.0 a 3.0 c |
0.0 a 3.1 c |
|||||||
B3LYP | 0.0 a 4.2 b 1.6 c |
0.0 a 4.5 b 1.8 c |
0.0 a 4.6 b 0.1 c |
0.0 a 5.0 b 0.1 c |
0.0 a 3.9 b 0.7 c |
0.0 a 3.9 b 0.7 c |
0.0 a 5.0 b -0.8 c |
|||
PBEPBE | 0.0 a 4.1 b 1.1 c |
|||||||||
Moller Plesset perturbation | MP2 | 0.0 a 2.5 b 8.1 c |
0.0 a 3.3 b 8.5 c |
0.0 a 2.5 b 8.8 c |
0.0 a 3.5 b 9.4 c |
0.0 a 2.3 b 8.5 c |
0.0 a 2.2 b 8.7 c |
0.0 a 2.8 b 7.5 c |