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Release 17bSeptember 2015
NIST Standard Reference Database 101
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IV.A.4. (XIV.F.)

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

Isomers of C4H7NO

index Species CAS number Name Relative experimental enthalpy (kJ mol-1) sketch
a C4H7NO 616455 2-Pyrrolidinone 0.0 sketch of 2-Pyrrolidinone
b C4H7NO 79390 Methacrylamide 39.7 sketch of Methacrylamide
c C4H7NO 1120645 Oxazole, 4,5-dihydro-2-methyl- 66.9 sketch of Oxazole, 4,5-dihydro-2-methyl-
d C4H7NO 62957602 Ethoxyacetonitrile 127.9 sketch of Ethoxyacetonitrile
The calculated enthalpies include the calculated and scaled vibrational zero-point energy.
Methods with predefined basis sets
semi-empirical AM1 0.0 a
52.6 b
90.2 c
363.1 d
PM3
209.4 d
PM6 0.0 a
44.0 b
72.5 c
140.6 d
MNDOd 0.0 a
83.7 b
50.6 c
composite G1 0.0 a
27.7 b
65.1 c
119.5 d
G2MP2 0.0 a
29.0 b
68.2 c
122.9 d
G2 0.0 a
28.9 b
68.9 c
123.0 d
G3 0.0 a
-61.5 b
-19.4 c
33.2 d
G3B3 0.0 a
27.1 b
68.6 c
G3MP2 0.0 a
25.2 b
68.9 c
G4 0.0 a
26.8 b
67.8 c
120.0 d
CBS-Q 0.0 a
122.8 d
molecular mechanics DREIDING
  c
MM3 0.0 a
-131.0 b
91.5 c

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
184.5 b
0.9 c
0.0 a
50.7 b
97.6 c
0.0 a
50.7 b
97.6 c
0.0 a
27.4 b
109.6 c
  0.0 a
44.5 b
77.6 c
  0.0 a
46.5 b
76.8 c
0.0 a
38.1 b
79.7 c
0.0 a
43.7 b
73.7 c
0.0 a
36.5 b
75.5 c
0.0 a
39.9 b
77.9 c
0.0 a
74.9 c
0.0 a
40.5 b
78.2 c
0.0 a
35.4 b
74.7 c
0.0 a
74.9 c
density functional LSDA 0.0 a
179.1 b
13.2 c
0.0 a
82.8 b
106.1 c
0.0 a
82.8 b
106.1 c
0.0 a
61.0 b
110.9 c
0.0 a
80.6 b
75.3 c
0.0 a
74.0 b
80.6 c
0.0 a
69.0 b
86.0 c
0.0 a
73.6 b
88.5 c
0.0 a
64.3 b
91.6 c
0.0 a
74.2 b
79.5 c
  0.0 a
73.5 b
84.8 c
0.0 a
62.1 b
85.9 c
0.0 a
68.5 b
88.0 c
  0.0 a
62.1 b
85.9 c
BLYP 0.0 a
135.4 b
-12.8 c
0.0 a
43.8 b
76.6 c
0.0 a 0.0 a
18.6 b
83.9 c
  0.0 a
29.8 b
62.6 c
0.0 a
23.3 b
68.9 c
0.0 a 0.0 a
20.0 b
71.8 c
0.0 a
28.9 b
62.2 c
  0.0 a
28.8 b
67.5 c
0.0 a
16.6 b
68.3 c
0.0 a
24.0 b
72.4 c
  0.0 a
16.6 b
68.3 c
B1B95 0.0 a
161.6 b
3.6 c
0.0 a
66.6 b
95.9 c
0.0 a
66.7 b
95.9 c
0.0 a
42.4 b
103.2 c
0.0 a
62.8 b
69.6 c
0.0 a
54.4 b
74.2 c
0.0 a
49.7 b
78.7 c
0.0 a
55.1 b
77.9 c
0.0 a
46.8 b
81.1 c
0.0 a
54.5 b
71.9 c
  0.0 a
53.3 b
76.6 c
0.0 a
47.4 b
76.9 c
0.0 a
51.3 b
80.2 c
  0.0 a
47.4 b
76.9 c
B3LYP 0.0 a
152.5 b
-4.6 c
0.0 a
52.9 b
87.3 c
0.0 a
52.9 b
87.3 c
0.0 a
28.5 b
94.9 c
0.0 a
47.6 b
63.8 c
0.0 a
41.1 b
69.2 c
0.0 a
35.2 b
74.7 c
0.0 a
39.2 b
74.1 c
0.0 a
31.4 b
77.4 c
0.0 a
39.7 b
68.1 c
0.0 a
28.7 b
74.4 c
0.0 a
39.5 b
73.1 c
0.0 a
28.3 b
73.4 c
0.0 a
34.9 b
77.2 c
  0.0 a
28.3 b
73.4 c
B3LYPultrafine         0.0 a
47.6 b
63.8 c
                     
B3PW91 0.0 a
163.5 b
3.2 c
0.0 a
68.1 b
98.6 c
0.0 a
68.1 b
98.6 c
0.0 a
43.6 b
104.2 c
0.0 a
63.1 b
71.2 c
0.0 a
56.1 b
76.6 c
0.0 a
51.6 b
80.8 c
0.0 a
56.2 b
80.3 c
0.0 a
47.8 b
0.0 a
55.2 b
74.4 c
  0.0 a
55.0 b
78.8 c
0.0 a
45.8 b
78.7 c
0.0 a
51.8 b
81.6 c
  0.0 a
45.8 b
78.7 c
mPW1PW91 0.0 a
169.5 b
4.9 c
0.0 a
72.6 b
100.8 c
0.0 a
73.0 b
101.2 c
0.0 a
48.2 b
107.0 c
0.0 a
67.7 b
72.9 c
0.0 a
60.5 b
78.3 c
0.0 a
55.9 b
82.7 c
0.0 a
61.0 b
81.6 c
0.0 a
52.2 b
84.8 c
0.0 a
59.6 b
75.8 c
  0.0 a
59.1 b
80.2 c
0.0 a
45.2 b
74.9 c
0.0 a
56.1 b
82.9 c
  0.0 a
45.2 b
74.9 c
PBEPBE 0.0 a
153.5 b
-1.2 c
0.0 a
66.3 b
91.1 c
0.0 a
66.3 b
91.1 c
0.0 a
39.8 b
97.3 c
0.0 a
58.0 b
67.7 c
0.0 a
51.4 b
73.2 c
0.0 a
46.0 b
78.8 c
0.0 a
51.3 b
77.9 c
0.0 a
42.9 b
81.3 c
0.0 a
51.0 b
71.2 c
0.0 a
40.9 b
78.1 c
0.0 a
50.5 b
76.5 c
0.0 a
40.9 b
76.9 c
0.0 a
46.5 b
80.1 c
  0.0 a
40.9 b
76.9 c
PBEPBEultrafine         0.0 a
58.1 b
67.8 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) cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
Moller Plesset perturbation MP2 0.0 a
135.4 b
-3.0 c
0.0 a
41.6 b
83.0 c
0.0 a
41.6 b
83.0 c
0.0 a
16.4 b
91.6 c
  0.0 a
50.3 b
75.3 c
    0.0 a
46.2 b
83.4 c
0.0 a
53.5 b
76.7 c
  0.0 a
47.4 b
81.0 c
  0.0 a    
MP2=FULL   0.0 a 0.0 a 0.0 a 0.0 a
55.9 b
71.5 c
0.0 a 0.0 a 0.0 a
53.0 b
81.8 c
0.0 a
47.1 b
84.5 c
    0.0 a        
MP3         0.0 a
52.4 b
64.4 c
                     
Configuration interaction CID   0.0 a     0.0 a                      
CISD   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
Quadratic configuration interaction QCISD   0.0 a
78.3 c
0.0 a 0.0 a 0.0 a                      
Coupled Cluster CCD   0.0 a 0.0 a 0.0 a 0.0 a 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
42.9 b
102.4 c
0.0 a
68.2 b
67.9 c
0.0 a
35.2 b
101.6 c
0.0 a
52.4 b
69.3 c
0.0 a
31.9 b
108.0 c
0.0 a
32.3 b
108.2 c
density functional B1B95 0.0 a
61.3 b
102.0 c
0.0 a
81.0 b
70.3 c
       
B3LYP 0.0 a
42.6 b
89.6 c
0.0 a
60.5 b
62.3 c
0.0 a
32.9 b
88.4 c
0.0 a
45.7 b
63.3 c
0.0 a
32.0 b
94.6 c
0.0 a
32.0 b
94.6 c
Moller Plesset perturbation MP2 0.0 a
27.7 b
88.6 c
0.0 a
67.1 b
66.6 c
0.0 a
18.2 b
88.1 c
0.0 a
51.7 b
67.9 c
0.0 a
17.3 b
95.4 c
0.0 a
17.2 b
95.2 c
MP2=FULL  
NC
 
NC
   

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
-32.0 b
-133.9 c
0.0 a
-40.5 b
-123.9 c
  0.0 a
-40.5 b
-123.9 c
MP2FC// B3LYP/6-31G* 0.0 a
-52.8 b
-19.8 c
     
MP2FC// MP2FC/6-31G*     0.0 a
41.4 b
81.2 c
 
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 III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.