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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 | C6H12O2 | 598981 | Methyl pivalate | ![]() |
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b | C6H12O2 | 142621 | Hexanoic acid | 0.0 | ![]() |
semi-empirical | AM1 | 0.0 b |
---|---|---|
PM3 | 516.0 a 0.0 b |
|
PM6 | 0.0 b |
|
composite | G1 | -977.9 a 0.0 b |
G2MP2 | -975.3 a 0.0 b |
|
G2 | -975.2 a 0.0 b |
|
G3 | -973.4 a 0.0 b |
|
G3B3 | 14.2 a 0.0 b |
|
G4 | 0.0 b |
|
CBS-Q | 20.5 a 0.0 b |
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 | aug-cc-pVQZ | daug-cc-pVTZ | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hartree fock | HF | -5.6 a 0.0 b |
-4.7 a 0.0 b |
-4.7 a 0.0 b |
29.7 a 0.0 b |
36.2 a 0.0 b |
39.0 a 0.0 b |
25.4 a 0.0 b |
37.3 a 0.0 b |
34.2 a 0.0 b |
0.0 b |
37.8 a 0.0 b |
38.7 a 0.0 b |
40.0 a 0.0 b |
44.3 a 0.0 b |
39.6 a 0.0 b |
a | NC | ||
ROHF | a | -4.7 a 0.0 b |
-4.7 a 0.0 b |
29.7 a 0.0 b |
24.5 a 0.0 b |
36.2 a 0.0 b |
39.0 a 0.0 b |
25.4 a 0.0 b |
NC | 34.2 a 0.0 b |
37.8 a 0.0 b |
38.7 a 0.0 b |
NC | 44.2 a 0.0 b |
39.6 a 0.0 b |
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density functional | LSDA | NC | NC | NC | NC | NC | NC | NC | NC | NC | NC | |||||||||
BLYP | a | 0.0 b |
0.0 b |
17.1 a 0.0 b |
14.7 a 0.0 b |
24.7 a 0.0 b |
34.6 a 0.0 b |
21.4 a 0.0 b |
31.5 a 0.0 b |
22.0 a 0.0 b |
30.2 a 0.0 b |
34.5 a 0.0 b |
||||||||
B1B95 | -12.1 a 0.0 b |
-8.6 a 0.0 b |
-8.5 a 0.0 b |
0.0 b |
18.9 a 0.0 b |
29.3 a 0.0 b |
NC | NC | 32.9 a 0.0 b |
27.5 a 0.0 b |
NC | NC | 36.9 a 0.0 b |
41.5 a 0.0 b |
36.9 a 0.0 b |
a | ||||
B3LYP | a | -7.1 a 0.0 b |
-7.1 a 0.0 b |
21.4 a 0.0 b |
17.7 a 0.0 b |
NC | NC | 22.7 a 0.0 b |
33.5 a 0.0 b |
25.6 a 0.0 b |
0.0 b |
NC | NC | 37.8 a 0.0 b |
42.2 a 0.0 b |
38.1 a 0.0 b |
a | |||
B3LYPultrafine | NC | 0.0 b |
||||||||||||||||||
B3PW91 | -10.4 a 0.0 b |
0.9 a 0.0 b |
0.9 a 0.0 b |
27.6 a 0.0 b |
23.9 a 0.0 b |
34.5 a 0.0 b |
40.7 a 0.0 b |
27.2 a 0.0 b |
38.3 a 0.0 b |
32.6 a 0.0 b |
38.1 a 0.0 b |
41.1 a 0.0 b |
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mPW1PW91 | a | -1.0 a 0.0 b |
-1.0 a 0.0 b |
26.9 a 0.0 b |
23.0 a 0.0 b |
33.7 a 0.0 b |
39.8 a 0.0 b |
25.9 a 0.0 b |
37.3 a 0.0 b |
32.0 a 0.0 b |
37.1 a 0.0 b |
40.3 a 0.0 b |
||||||||
M06-2X | -19.3 a 0.0 b |
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PBEPBE | a | 0.0 b |
22.2 a 0.0 b |
0.0 b |
0.0 b |
24.1 a 0.0 b |
34.8 a 0.0 b |
0.0 b |
0.0 b |
40.0 a 0.0 b |
a | |||||||||
PBE1PBE | 0.0 b |
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TPSSh | 17.8 a 0.0 b |
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wB97X-D | a | a | a | a | a | a | a | |||||||||||||
B97D3 | 0.0 b |
12.9 a 0.0 b |
0.0 b |
28.2 a 0.0 b |
0.0 b |
0.0 b |
0.0 b |
0.0 b |
||||||||||||
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 | aug-cc-pVQZ | daug-cc-pVTZ | ||
Moller Plesset perturbation | MP2 | -17.1 a 0.0 b |
-14.7 a 0.0 b |
a | a | 10.7 a 0.0 b |
19.2 a 0.0 b |
21.2 a 0.0 b |
11.3 a 0.0 b |
26.1 a 0.0 b |
26.2 a 0.0 b |
|||||||||
MP2=FULL | -17.0 a 0.0 b |
-15.1 a 0.0 b |
-15.1 a 0.0 b |
15.9 a 0.0 b |
9.3 a 0.0 b |
0.0 b |
0.0 b |
11.0 a 0.0 b |
0.0 b |
8.1 a 0.0 b |
25.3 a 0.0 b |
a | ||||||||
MP3 | 20.2 a 0.0 b |
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B2PLYP | 0.0 b |
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Configuration interaction | CID | -8.4 a 0.0 b |
-8.4 a 0.0 b |
23.7 a 0.0 b |
19.2 a 0.0 b |
20.0 a 0.0 b |
||||||||||||||
CISD | -9.3 a 0.0 b |
-9.3 a 0.0 b |
22.6 a 0.0 b |
18.5 a 0.0 b |
19.5 a 0.0 b |
|||||||||||||||
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 | aug-cc-pVQZ | daug-cc-pVTZ | ||
Quadratic configuration interaction | QCISD | 0.0 b |
||||||||||||||||||
Coupled Cluster | CCD | NC | ||||||||||||||||||
CCSD | 16.5 a 0.0 b |
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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 | aug-cc-pVQZ | daug-cc-pVTZ |
CEP-31G | CEP-31G* | CEP-121G | CEP-121G* | LANL2DZ | SDD | cc-pVTZ-PP | aug-cc-pVTZ-PP | Def2TZVPP | ||
---|---|---|---|---|---|---|---|---|---|---|
hartree fock | HF | 27.2 a 0.0 b |
20.0 a 0.0 b |
32.8 a 0.0 b |
26.5 a 0.0 b |
32.7 a 0.0 b |
32.8 a 0.0 b |
40.3 a 0.0 b |
||
density functional | B3LYP | 19.8 a 0.0 b |
15.8 a 0.0 b |
0.0 b |
0.0 b |
0.0 b |
0.0 b |
38.3 a 0.0 b |
||
PBEPBE | 40.1 a 0.0 b |
|||||||||
Moller Plesset perturbation | MP2 | 10.5 a 0.0 b |
5.8 a 0.0 b |
9.5 a 0.0 b |
6.2 a 0.0 b |
13.9 a 0.0 b |
13.6 a 0.0 b |
27.5 a 0.0 b |