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Relative enthalpies of isomers - Comparison of 298.15K enthalpies (kJ mol-1)

Isomers of C6H12O2

index Species CAS number Name Relative experimental enthalpy (kJ mol-1) sketch
a C6H12O2 598981 Methyl pivalate   sketch of Methyl pivalate
b C6H12O2 142621 Hexanoic acid 0.0 sketch of Hexanoic acid
The calculated enthalpies include the calculated and scaled vibrational zero-point energy.
Methods with predefined basis sets
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

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 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
   
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
         
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
                               
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
                           
TPSSh                   17.8 a
0.0 b
                 
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
                           
B2PLYP                          
0.0 b
         
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
                           
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

Methods with effective core potentials (select basis sets)
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
NC = not calculated
For descriptions of the methods (AM1, HF, MP2, ...) and basis sets (3-21G, 3-21G*, 6-31G, ...) see the glossary in section I.C. Predefined means the basis set used is determined by the method.
gaw refers to the group additivity method implemeted in the NIST Chemistry Webbook.
See section Calculated; Vibrations; Scale Factors; Scale factors to list vibrational scaling factors.
See section Calculated; Vibrations; Scale Factors; Calculate a scale factor to calculate a vibrational scaling factor for a given set of molecules.