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

Isomers of CH2O

index Species CAS number Name Relative experimental enthalpy (kJ mol-1) sketch
a HOCH 19710566 hydroxycarbene   sketch of hydroxycarbene
b H2CO 50000 Formaldehyde 0.0 sketch of Formaldehyde
The calculated enthalpies include the calculated and scaled vibrational zero-point energy.
Methods with predefined basis sets
semi-empirical AM1 260.9 a
0.0 b
PM3 202.2 a
PM6 199.9 a
0.0 b
MNDOd
0.0 b
composite G1 313.7 a
0.0 b
G2MP2 310.7 a
0.0 b
G2 311.2 a
0.0 b
G3 312.1 a
0.0 b
G3B3 304.5 a
0.0 b
G3MP2
0.0 b
G4
0.0 b
CBS-Q 314.3 a
0.0 b
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) 6-311+G(3df,2pd) cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ
hartree fock HF                    
0.0 b

0.0 b
       
0.0 b
   
density functional LSDA
0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b
   
0.0 b

0.0 b

0.0 b
 
0.0 b
   
BLYP
0.0 b

0.0 b

0.0 b

0.0 b
 
0.0 b

0.0 b

0.0 b

0.0 b

0.0 b
   
0.0 b

0.0 b

0.0 b
 
0.0 b
   
B1B95
0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b
   
0.0 b

0.0 b

0.0 b
 
0.0 b
   
B3LYP                    
0.0 b

0.0 b
       
0.0 b
   
B3LYPultrafine  
0.0 b
   
0.0 b
         
0.0 b

0.0 b
     
0.0 b
     
B3PW91
0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b
   
0.0 b

0.0 b

0.0 b
 
0.0 b
   
mPW1PW91
0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b
   
0.0 b

0.0 b

0.0 b
 
0.0 b
   
PBEPBE
0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

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) 6-311+G(3df,2pd) cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ
Moller Plesset perturbation MP2
0.0 b

0.0 b

0.0 b

0.0 b
 
0.0 b
   
0.0 b
 
0.0 b

0.0 b

0.0 b
 
0.0 b
 
0.0 b

0.0 b

0.0 b
MP2=FULL  
0.0 b
     
0.0 b

0.0 b

0.0 b

0.0 b
     
0.0 b
 
0.0 b
   
0.0 b

0.0 b
MP3        
0.0 b
                           
MP4        
0.0 b
   
0.0 b
                     
Configuration interaction CID        
0.0 b
   
0.0 b
                     
CISD        
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) 6-311+G(3df,2pd) cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ
Quadratic configuration interaction QCISD  
0.0 b
     
0.0 b

0.0 b

0.0 b

0.0 b
     
0.0 b
           
QCISD(T)        
0.0 b
   
0.0 b
                     
Coupled Cluster CCD              
0.0 b
       
0.0 b
           
CCSD              
0.0 b
                     
CCSD(T)        
0.0 b

0.0 b

0.0 b

0.0 b
   
0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b
CCSD(T)=FULL        
0.0 b
             
0.0 b

0.0 b

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) 6-311+G(3df,2pd) cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ

Methods with effective core potentials (select basis sets)
CEP-31G CEP-31G* CEP-121G CEP-121G* LANL2DZ SDD
density functional B1B95
0.0 b

0.0 b
       
Moller Plesset perturbation MP2
0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

Single point energy calculations (select basis sets)
6-311+G(3df,2p) cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
Moller Plesset perturbation MP2FC// HF/6-31G*
0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b
MP2FC// B3LYP/6-31G*
0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b
MP2FC// MP2FC/6-31G*
0.0 b

0.0 b

0.0 b

0.0 b
 
0.0 b
MP4// HF/6-31G*
0.0 b
 
0.0 b
   
0.0 b
MP4// B3LYP/6-31G*  
0.0 b

0.0 b
   
0.0 b
MP4// MP2/6-31G*
0.0 b
 
0.0 b
   
0.0 b
Coupled Cluster CCSD// HF/6-31G*
0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b
CCSD(T)// HF/6-31G*
0.0 b

0.0 b

0.0 b

0.0 b

0.0 b

0.0 b
CCSD// B3LYP/6-31G*
0.0 b

0.0 b

0.0 b

0.0 b
 
0.0 b
CCSD(T)// B3LYP/6-31G*
0.0 b

0.0 b

0.0 b

0.0 b
 
0.0 b
CCSD(T)//B3LYP/6-31G(2df,p)    
0.0 b
   
0.0 b
CCSD// MP2FC/6-31G*
0.0 b

0.0 b

0.0 b

0.0 b
 
0.0 b
CCSD(T)// MP2FC/6-31G*
0.0 b

0.0 b

0.0 b

0.0 b
 
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.