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

Isomers of C6H6O

index Species CAS number Name Relative experimental enthalpy (kJ mol-1) sketch
a C6H6O 24599573 2,4-Cyclohexadienone   sketch of 2,4-Cyclohexadienone
b C6H5OH 108952 phenol 0.0 sketch of phenol
c C6H6O 5664335 2,5-Cyclohexadienone 46.4 sketch of 2,5-Cyclohexadienone
The calculated enthalpies include the calculated and scaled vibrational zero-point energy.
Methods with predefined basis sets
semi-empirical AM1
0.0 b
PM3 49.2 a
0.0 b
54.4 c
MNDOd
0.0 b
composite G1
0.0 b
65.4 c
G2MP2
0.0 b
65.9 c
G2
0.0 b
65.6 c
G3
0.0 b
69.5 c
G3B3 72.6 a
0.0 b
66.9 c
G3MP2 76.7 a
0.0 b
G4 72.3 a
0.0 b
67.5 c
CBS-Q
0.0 b
375.2 c
molecular mechanics MM3
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 aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z daug-cc-pVTZ
hartree fock HF
0.0 b
87.5 c
87.8 a
0.0 b
80.3 c

0.0 b
80.3 c

0.0 b
83.6 c
50.2 a
0.0 b
42.0 c

0.0 b
55.5 c
65.6 a
0.0 b
57.9 c

0.0 b
38.6 c

0.0 b
55.3 c

0.0 b
52.7 c
63.9 a
0.0 b
65.3 a
0.0 b
57.3 c

0.0 b
54.0 c

0.0 b
56.1 c

0.0 b
53.8 c

0.0 b
56.5 c

0.0 b
66.4 a
0.0 b
56.5 c
density functional LSDA NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
 
NC
NC
NC
NC
NC
NC
NC

NC
NC  
BLYP
0.0 b
79.3 c

0.0 b
52.6 c

0.0 b
52.6 c

0.0 b
58.4 c
53.3 a
0.0 b
50.6 c

0.0 b
61.0 c

0.0 b
62.7 c

0.0 b
48.8 c

0.0 b
63.4 c

0.0 b
64.9 c
 
NC

0.0 b
64.0 c

0.0 b
67.8 c

0.0 b
 
0.0 b
 
B1B95
0.0 b
93.8 c

0.0 b
78.6 c

0.0 b
78.6 c

0.0 b
88.2 c

0.0 b
62.5 c

0.0 b
107.0 c
78.0 a
0.0 b
86.0 c

0.0 b
70.8 c

0.0 b
86.7 c

0.0 b
86.6 c
 
NC

0.0 b
84.7 c

0.0 b
79.7 c

0.0 b
77.9 c

0.0 b
80.5 c

0.0 b
 
B3LYP
0.0 b
85.8 c
67.2 a
0.0 b
62.6 c

0.0 b
62.6 c

0.0 b
68.7 c
60.0 a
0.0 b
56.1 c

0.0 b
67.2 c
72.4 a
0.0 b
69.0 c

0.0 b
53.9 c

0.0 b
69.3 c
75.4 a
0.0 b
70.5 c

0.0 b
74.3 a
0.0 b
70.8 c

0.0 b
69.3 c

0.0 b
73.3 c

0.0 b
72.5 c
78.9 a
0.0 b
74.3 c

0.0 b
 
B3LYPultrafine  
NC
   
0.0 b
56.1 c

NC

NC

NC
     
NC

NC

NC

NC
78.9 a
0.0 b
74.4 c
   
B3PW91
0.0 b
87.0 c

0.0 b
65.0 c

0.0 b
65.0 c

0.0 b
70.9 c

0.0 b
59.3 c

0.0 b
70.7 c

0.0 b
72.1 c

0.0 b
56.4 c

0.0 b
72.5 c

0.0 b
73.8 c
 
NC

0.0 b
71.7 c

0.0 b
76.7 c

0.0 b
 
0.0 b
 
mPW1PW91
0.0 b
89.0 c

0.0 b
61.7 c

0.0 b
67.6 c

0.0 b
73.3 c

0.0 b
54.6 c

0.0 b
66.4 c

0.0 b
67.8 c

0.0 b
51.7 c

0.0 b
73.7 c

0.0 b
75.0 c
 
NC

0.0 b
67.0 c

0.0 b
72.2 c

0.0 b
75.3 c

NC

0.0 b
 
M06-2X
NC

NC
80.9 a
0.0 b
75.4 c

NC

0.0 b
67.1 c

NC

NC

NC

NC

NC
 
NC

NC

NC

NC

NC
   
PBEPBE
0.0 b
84.0 c

0.0 b
56.3 c

0.0 b
56.3 c

0.0 b
61.8 c

0.0 b
55.4 c

0.0 b
66.4 c

0.0 b
67.4 c

0.0 b
52.8 c

0.0 b
68.5 c

0.0 b
70.5 c
 
NC

0.0 b
68.3 c

0.0 b
73.4 c

0.0 b
71.5 c

NC

0.0 b
 
PBEPBEultrafine  
NC
   
0.0 b
55.4 c

NC

NC

NC
     
NC

NC

NC

NC

NC
   
PBE1PBE
NC

NC

NC

NC

0.0 b
60.8 c

NC

NC

NC

NC

NC
 
NC

NC

NC

NC

NC
   
HSEh1PBE
NC

0.0 b
67.3 c

NC

NC

0.0 b
60.3 c

NC

0.0 b
73.4 c

NC

NC

NC
 
NC

NC

0.0 b
77.9 c

NC

NC
   
TPSSh  
NC

NC

NC
58.2 a
0.0 b
54.5 c

NC
70.0 a
0.0 b
66.8 c

NC
  73.1 a
0.0 b
 
NC

NC
76.0 a
0.0 b
71.4 c

NC

NC
   
wB97X-D     68.6 a
0.0 b
65.2 c
  60.0 a
0.0 b
57.1 c
  72.3 a
0.0 b
69.8 c
  72.7 a
0.0 b
69.5 c
    73.0 a
0.0 b
70.4 c
72.4 a
0.0 b
69.8 c
76.7 a
0.0 b
72.7 c
  77.3 a
0.0 b
73.2 c
   
B97D3   59.4 a
0.0 b
56.1 c
    55.4 a
0.0 b
53.0 c
  67.3 a
0.0 b
65.4 c
  68.4 a
0.0 b
66.1 c
 
0.0 b
69.6 c

0.0 b
67.8 c
 
0.0 b
70.4 c
 
0.0 b
71.3 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 daug-cc-pVTZ
Moller Plesset perturbation MP2
0.0 b
45.3 c

0.0 b
56.8 c

0.0 b
56.8 c

0.0 b
65.0 c

0.0 b
66.9 c

0.0 b
77.2 c

0.0 b
80.6 c

0.0 b
63.2 c

0.0 b
82.2 c

  c
   
0.0 b
79.5 c

0.0 b
90.9 c

0.0 b
84.4 c

0.0 b
91.6 c
   
MP2=FULL
NC

NC

NC

NC

NC

NC

NC

NC

0.0 b
83.0 c

NC
   
NC

0.0 b
92.5 c

NC

NC
   
MP3        
0.0 b
55.4 c
 
  c
         
NC

NC
       
MP3=FULL         61.7 a
0.0 b
 
NC
         
NC

NC
       
MP4  
NC
           
NC
     
NC
 
NC
     
MP4=FULL  
NC
   
NC
     
NC
         
NC
     
B2PLYP
NC

NC

NC

NC

0.0 b
56.1 c

NC

NC

NC

NC

NC
 
NC

NC
80.7 a
0.0 b
75.3 c

NC

NC
   
B2PLYP=FULL
NC

NC

NC

NC

NC

NC

NC

NC

NC

NC
 
NC

NC

NC

NC

NC
   
Configuration interaction CID  
NC

NC

NC

NC
   
NC
                   
CISD  
NC

NC

NC

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 daug-cc-pVTZ
Quadratic configuration interaction QCISD  
NC

NC

NC

  c

NC

NC

NC

NC

NC
   
NC
 
NC
     
QCISD(T)        
NC
                         
QCISD(T)=FULL        
NC
 
NC
         
NC
         
Coupled Cluster CCD  
NC

NC

NC

0.0 b
50.3 c

NC

NC

NC

NC

NC
   
NC

NC

NC
     
CCSD        
NC
             
NC
 
NC
     
CCSD=FULL        
NC
             
NC
 
NC
     
CCSD(T)        
NC
             
NC
         
CCSD(T)=FULL        
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 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
0.0 b
79.0 c

0.0 b
35.1 c

0.0 b
81.5 c

0.0 b
39.2 c

0.0 b
85.3 c

0.0 b
85.1 c
    66.6 a
0.0 b
56.8 c
density functional B1B95 77.5 a
0.0 b
63.4 a
0.0 b
             
B3LYP
0.0 b
67.9 c

0.0 b
51.6 c

0.0 b
70.9 c

0.0 b
55.5 c

0.0 b
73.0 c

0.0 b
72.7 c
    78.5 a
0.0 b
74.1 c
PBEPBE                 77.0 a
0.0 b
74.0 c
Moller Plesset perturbation MP2
0.0 b
60.7 c

0.0 b
56.5 c
 
NC

0.0 b
67.0 c

0.0 b
66.6 c
   
0.0 b
92.0 c

Single point energy calculations (select basis sets)
aug-cc-pVDZ
Moller Plesset perturbation MP2FC// MP2FC/6-31G*
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.