Table 4.
Values of ionization potentials and proton dissociation enthalpies [kcal/mol].
| Flavonoid | Ionization Potential | Proton Dissociation Enthalpy | |||||||
|---|---|---|---|---|---|---|---|---|---|
| C2’ | C3’ | C4’ | C5’ | C3 | C5 | C7 | |||
| Flavones | Acacetin | 115.9 | 16.1 | 5.0 | |||||
| Apigenin | 117.0 | 2.2 | 13.4 | 4.6 | |||||
| Chrysin | 120.5 | 11.4 | 2.1 | ||||||
| Chrysoeriol | 113.4 | 3.5 | 23.2 | 8.1 | |||||
| Diosmetin | 113.8 | 3.9 | 22.9 | 8.1 | |||||
| Genkwanin | 117.2 | 1.4 | 14.8 | ||||||
| Luteolin | 115.0 | 3.1 | −0.7 | 20.9 | 6.6 | ||||
| Flavonols | Fisetin | 108.9 | 4.4 | 6.0 | 7.6 | 11.3 | |||
| Galangin | 114.3 | 2.4 | 14.0 | 7.2 | |||||
| Kaempferol | 110.2 | 6.4 | 5.2 | 18.0 | 10.0 | ||||
| Morin | 113.3 | 10.0 | 5.4 | 1.3 | 15.7 | 8.1 | |||
| Myricetin | 109.0 | 8.4 | 1.5 | 5.3 | 6.9 | 19.2 | 11.9 | ||
| Quercetin | 108.9 | 8.4 | 2.4 | 6.5 | 19.0 | 11.4 | |||
The numbers in bold typeface indicate the lowest value for a given compound.