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Table 1 Total and relative energies for the studied species using two methods (B3LYP and MP2) at 6-311 ++G** basis set in the gas phase and in the solution

From: Tautomerization, acidity, basicity, and stability of cyanoform: a computational study

Structure

Gas phase

Solvent

MP2

B3LYP

 

MP2

B3LYP

Et/au

 

kcal/mol

Et/au

 

kcal/mol

 

kcal/mol

1

−316.40004

 

0.0

−317.27785

 

0.000

 

0.0

0.0

2

−316.37761

Ere

14.1

−317.27506

Ere

1.8

Ere

13.4

0.7

TS

−316.28143

Ea

77.5

−316.79868

Ea

68.7

Ea

74.4

68.4

CF

−315.91668

DP

303.3

−317.16841

DP

300.7

DP

272.7

262.6

(CFH)+

−316.70615

PA(H)

−46.8

−317.54566

PA(H)

−168.1

PA(H)

−230.1

−231.4

  1. E t electronic energy, E re relative energy between two tautomeric forms, E a barrier energy, DP deprotonation energy, PA protonation energy