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

Isomers of C4H12N2

index Species CAS number Name Relative experimental enthalpy (kJ mol-1) sketch
a C4H12N2 811938 2-Methyl-1,2-propanediamine 0.0 sketch of 2-Methyl-1,2-propanediamine
b C4H12N2 4426486 1,2-Butanediamine 16.7 sketch of 1,2-Butanediamine
The calculated enthalpies include the calculated and scaled vibrational zero-point energy.
Methods with predefined basis sets
semi-empirical AM1 0.0 a
-22.2 b
PM3 0.0 a
16.1 b
MNDOd 0.0 a
-28.3 b
composite G1 0.0 a
G2MP2 0.0 a
G2 0.0 a
G3 0.0 a
19.0 b
G3B3 0.0 a
18.2 b
G3MP2 0.0 a
18.6 b
G4 0.0 a
18.6 b
molecular mechanics MM3 0.0 a
6.6 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 a
4.6 b
0.0 a
13.1 b
0.0 a
13.1 b
0.0 a
10.5 b
0.0 a
5.2 b
0.0 a
6.0 b
0.0 a
6.1 b
0.0 a
5.2 b
0.0 a
6.4 b
0.0 a
5.8 b
0.0 a
6.4 b
0.0 a
6.4 b
0.0 a
6.4 b
0.0 a
5.8 b
0.0 a
5.8 b
0.0 a
5.7 b
0.0 a
5.8 b
0.0 a
5.7 b
density functional LSDA 0.0 a
-2.4 b
0.0 a
10.7 b
0.0 a
10.7 b
0.0 a
14.2 b
0.0 a
13.6 b
0.0 a
14.1 b
0.0 a
13.4 b
0.0 a
12.6 b
0.0 a
14.1 b
0.0 a
14.3 b
    0.0 a
14.2 b
0.0 a
13.9 b
0.0 a
13.7 b
  0.0 a
13.9 b
 
BLYP 0.0 a
7.0 b
0.0 a
11.4 b
  0.0 a
11.7 b
0.0 a
9.8 b
0.0 a
10.0 b
0.0 a
8.1 b
  0.0 a
9.6 b
0.0 a
10.1 b
    0.0 a
9.7 b
0.0 a
8.3 b
0.0 a
7.5 b
  0.0 a
8.3 b
 
B1B95 0.0 a
6.4 b
0.0 a
12.4 b
0.0 a
12.4 b
0.0 a
11.9 b
0.0 a
9.4 b
0.0 a
10.1 b
0.0 a
9.8 b
0.0 a
9.1 b
0.0 a
10.6 b
0.0 a
10.1 b
    0.0 a
9.9 b
0.0 a
10.2 b
0.0 a
9.3 b
  0.0 a
10.2 b
 
B3LYP 0.0 a
6.9 b
0.0 a
12.1 b
0.0 a
12.1 b
0.0 a
11.5 b
0.0 a
8.9 b
0.0 a
9.4 b
0.0 a
8.1 b
0.0 a
7.8 b
0.0 a
9.3 b
0.0 a
9.2 b
0.0 a
8.5 b
0.0 a
8.5 b
0.0 a
9.3 b
0.0 a
8.3 b
0.0 a
7.7 b
0.0 a
7.9 b
0.0 a
8.3 b
 
B3LYPultrafine         0.0 a
9.0 b
                    0.0 a
7.9 b
   
B3PW91 0.0 a
6.6 b
0.0 a
12.9 b
0.0 a
12.9 b
0.0 a
11.7 b
0.0 a
8.9 b
0.0 a
9.5 b
0.0 a
8.7 b
0.0 a
8.2 b
0.0 a
9.7 b
0.0 a
9.0 b
    0.0 a
9.5 b
0.0 a
8.4 b
0.0 a
8.1 b
  0.0 a
8.5 b
 
mPW1PW91 0.0 a
6.8 b
0.0 a
13.4 b
0.0 a
13.4 b
0.0 a
12.1 b
0.0 a
9.3 b
0.0 a
9.9 b
0.0 a
9.2 b
0.0 a
8.7 b
0.0 a
10.2 b
0.0 a
9.5 b
    0.0 a
9.9 b
0.0 a
9.1 b
0.0 a
8.6 b
  0.0 a
9.1 b
 
M06-2X     0.0 a
15.9 b
  0.0 a
13.0 b
                         
PBEPBE 0.0 a
6.6 b
0.0 a
13.1 b
0.0 a
13.1 b
0.0 a
12.9 b
0.0 a
11.4 b
0.0 a
11.9 b
0.0 a
10.4 b
0.0 a
10.4 b
0.0 a
11.8 b
0.0 a
11.5 b
    0.0 a
11.8 b
0.0 a
10.7 b
0.0 a
9.7 b
  0.0 a
10.7 b
 
PBEPBEultrafine         0.0 a
11.4 b
                         
PBE1PBE         0.0 a
10.1 b
                         
HSEh1PBE   0.0 a
13.7 b
    0.0 a
10.2 b
  0.0 a
9.9 b
            0.0 a
10.0 b
       
TPSSh         0.0 a
8.7 b
  0.0 a
8.1 b
    0.0 a
9.0 b
      0.0 a
8.3 b
       
wB97X-D     0.0 a
17.1 b
  0.0 a
12.5 b
  0.0 a
12.8 b
  0.0 a
13.4 b
    0.0 a
12.8 b
0.0 a
12.8 b
0.0 a
12.4 b
  0.0 a
12.7 b
   
B97D3   0.0 a
17.7 b
    0.0 a
14.8 b
  0.0 a
13.4 b
  0.0 a
15.1 b
  0.0 a
13.8 b
0.0 a
13.8 b
  0.0 a
13.6 b
  0.0 a
13.2 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 aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z daug-cc-pVTZ
Moller Plesset perturbation MP2 0.0 a
9.9 b
0.0 a
19.7 b
0.0 a
19.7 b
0.0 a
19.9 b
0.0 a
16.5 b
0.0 a
16.6 b
  0.0 a
18.5 b
0.0 a
18.0 b
0.0 a
16.6 b
  0.0 a
18.3 b
0.0 a
17.3 b
         
MP2=FULL         0.0 a
16.7 b
    0.0 a
18.7 b
0.0 a
18.3 b
                 
MP3         0.0 a
13.2 b
                         
MP3=FULL         0.0 a
13.5 b
  0.0 a
13.4 b
                     
B2PLYP         0.0 a
11.8 b
                0.0 a
11.6 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 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 a
6.8 b
0.0 a
3.8 b
0.0 a
7.8 b
0.0 a
5.6 b
0.0 a
7.9 b
0.0 a
8.1 b
    0.0 a
5.8 b
density functional B1B95 0.0 a
8.1 b
0.0 a
8.2 b
             
B3LYP 0.0 a
8.3 b
0.0 a
7.8 b
0.0 a
9.3 b
0.0 a
8.5 b
0.0 a
9.9 b
0.0 a
9.9 b
    0.0 a
8.2 b
PBEPBE                 0.0 a
10.5 b
Moller Plesset perturbation MP2 0.0 a
16.8 b
0.0 a
16.1 b
0.0 a
20.6 b
0.0 a
20.5 b
0.0 a
17.7 b
0.0 a
18.1 b
    0.0 a
16.6 b

Single point energy calculations (select basis sets)
cc-pVDZ cc-pVTZ aug-cc-pVDZ cc-pV(T+d)Z
Moller Plesset perturbation MP2FC// HF/6-31G* 0.0 a
7.5 b
0.0 a
5.2 b
  0.0 a
5.2 b
MP2FC// B3LYP/6-31G* 0.0 a
16.8 b
     
MP2FC// MP2FC/6-31G*     0.0 a
17.5 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.