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

Isomers of C4H9N

index Species CAS number Name Relative experimental enthalpy (kJ mol-1) sketch
a C4H9N 123751 Pyrrolidine 0.0 sketch of Pyrrolidine
b C4H9N 2516349 Cyclobutylamine 44.6 sketch of Cyclobutylamine
The calculated enthalpies include the calculated and scaled vibrational zero-point energy.
Methods with predefined basis sets
semi-empirical AM1 0.0 a
54.2 b
PM6 0.0 a
36.1 b
MNDOd 0.0 a
-467.7 b
composite G1 0.0 a
G2MP2 0.0 a
G2 0.0 a
G3 0.0 a
47.4 b
G3B3 0.0 a
47.0 b
G3MP2 0.0 a
46.5 b
G4 0.0 a
46.3 b
CBS-Q 0.0 a
46.6 b
molecular mechanics MM3
33.3 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) cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
hartree fock HF 0.0 a
93.7 b
0.0 a
71.1 b
0.0 a
71.1 b
0.0 a
59.9 b
  0.0 a
56.8 b
  0.0 a
61.5 b
0.0 a
55.7 b
0.0 a
58.6 b
0.0 a
56.2 b
0.0 a
57.9 b
0.0 a
56.4 b
0.0 a
55.3 b
0.0 a
55.9 b
0.0 a
56.4 b
density functional LSDA 0.0 a
95.4 b
0.0 a
73.1 b
0.0 a
73.1 b
0.0 a
62.9 b
0.0 a
65.9 b
0.0 a
60.0 b
0.0 a
55.0 b
0.0 a
62.1 b
0.0 a
55.4 b
0.0 a
61.3 b
  0.0 a
60.7 b
0.0 a
56.3 b
0.0 a
54.6 b
  0.0 a
56.3 b
BLYP 0.0 a
84.4 b
0.0 a
69.2 b
0.0 a
69.2 b
0.0 a
59.0 b
  0.0 a
54.8 b
0.0 a
49.4 b
0.0 a
56.1 b
0.0 a
50.3 b
0.0 a
55.7 b
  0.0 a
54.6 b
0.0 a 0.0 a
47.8 b
  0.0 a
B1B95 0.0 a
82.8 b
0.0 a
64.8 b
0.0 a
64.8 b
0.0 a
53.8 b
0.0 a
57.4 b
0.0 a
51.2 b
0.0 a
47.5 b
0.0 a
54.6 b
0.0 a
48.3 b
0.0 a
52.7 b
  0.0 a
51.7 b
0.0 a
50.0 b
0.0 a
47.5 b
  0.0 a
50.0 b
B3LYP 0.0 a
87.2 b
0.0 a
69.8 b
0.0 a
69.6 b
0.0 a
58.9 b
0.0 a
61.9 b
0.0 a
56.1 b
0.0 a
51.5 b
0.0 a
58.3 b
0.0 a
52.4 b
0.0 a
57.3 b
0.0 a
51.6 b
0.0 a
56.3 b
0.0 a
52.2 b
0.0 a
50.5 b
  0.0 a
52.2 b
B3LYPultrafine         0.0 a
61.9 b
                     
B3PW91 0.0 a
85.6 b
0.0 a
67.7 b
0.0 a
67.7 b
0.0 a
57.4 b
0.0 a
60.4 b
0.0 a
54.4 b
0.0 a
50.8 b
0.0 a
57.7 b
0.0 a
51.3 b
0.0 a
55.8 b
  0.0 a
55.0 b
0.0 a
52.0 b
0.0 a
50.6 b
  0.0 a
52.0 b
mPW1PW91 0.0 a
86.8 b
0.0 a
68.0 b
0.0 a
68.8 b
0.0 a
57.8 b
0.0 a
61.0 b
0.0 a
54.8 b
0.0 a
51.3 b
0.0 a
58.4 b
0.0 a
51.9 b
0.0 a
56.3 b
  0.0 a
55.6 b
0.0 a
48.3 b
0.0 a
51.3 b
  0.0 a
48.3 b
PBEPBE 0.0 a
84.3 b
0.0 a
68.2 b
0.0 a
68.3 b
0.0 a
57.9 b
0.0 a
59.6 b
0.0 a
53.5 b
0.0 a
48.9 b
0.0 a
56.1 b
0.0 a
49.7 b
0.0 a
54.6 b
0.0 a
48.9 b
0.0 a
53.6 b
0.0 a
50.0 b
0.0 a
48.0 b
  0.0 a
50.0 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) cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
Moller Plesset perturbation MP2 0.0 a
89.6 b
0.0 a
64.5 b
0.0 a
64.5 b
0.0 a
52.8 b
  0.0 a
53.0 b
    0.0 a
47.2 b
0.0 a
53.2 b
  0.0 a
52.3 b
0.0 a
50.2 b
0.0 a   0.0 a
50.2 b
MP2=FULL   0.0 a 0.0 a 0.0 a 0.0 a
57.2 b
0.0 a
53.1 b
0.0 a
50.2 b
0.0 a
53.1 b
0.0 a
47.1 b
    0.0 a 0.0 a     0.0 a
MP3         0.0 a
56.4 b
                     
Configuration interaction CID     0.0 a 0.0 a 0.0 a
59.8 b
    0.0 a                
CISD     0.0 a 0.0 a 0.0 a
60.0 b
    0.0 a                
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) cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
Quadratic configuration interaction QCISD   0.0 a
64.1 b
0.0 a 0.0 a 0.0 a 0.0 a
53.7 b
0.0 a
51.0 b
0.0 a 0.0 a
49.2 b
    0.0 a        
Coupled Cluster CCD   0.0 a 0.0 a 0.0 a 0.0 a
56.5 b
0.0 a   0.0 a                
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) cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z

Methods with effective core potentials (select basis sets)
CEP-31G CEP-31G* CEP-121G CEP-121G* LANL2DZ SDD
hartree fock HF 0.0 a
53.1 b
0.0 a
60.2 b
0.0 a
53.0 b
0.0 a
59.9 b
0.0 a
56.0 b
0.0 a
55.8 b
density functional B1B95 0.0 a
46.5 b
0.0 a
52.1 b
       
B3LYP 0.0 a
51.0 b
0.0 a
56.4 b
0.0 a
51.6 b
0.0 a
56.5 b
0.0 a
51.7 b
0.0 a
51.7 b
Moller Plesset perturbation MP2 0.0 a
47.0 b
0.0 a
51.9 b
0.0 a
42.2 b
0.0 a
49.4 b
0.0 a
46.4 b
0.0 a
46.1 b

Single point energy calculations (select basis sets)
6-311+G(3df,2p) cc-pVDZ cc-pVTZ aug-cc-pVDZ cc-pV(T+d)Z
Moller Plesset perturbation MP2FC// HF/6-31G*   0.0 a
53.2 b
0.0 a
56.6 b
  0.0 a
56.6 b
MP2FC// B3LYP/6-31G*   0.0 a
53.4 b
     
MP2FC// MP2FC/6-31G* 0.0 a 0.0 a   0.0 a
49.1 b
 
MP4// HF/6-31G*   0.0 a
54.2 b
     
MP4// MP2/6-31G* 0.0 a        
Coupled Cluster CCSD// HF/6-31G*   0.0 a
53.9 b
     
CCSD(T)// HF/6-31G*   0.0 a
53.8 b
     
CCSD(T)//B3LYP/6-31G(2df,p)     0.0 a   0.0 a
CCSD// MP2FC/6-31G* 0.0 a        
CCSD(T)// MP2FC/6-31G* 0.0 a        
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.