| Quantity | Direct (definition) | Isodesmic (amine reference) |
|---|---|---|
| BDE and RSE | HA → A* + H* | HA + NH2* → A* + NH3 |
| Proton affinity | A* + H+ → HA*+ | A* + NH4+ → HA*+ + NH3 |
| Electron affinity (to anion) |
A* + e− → A− | A* + NH2− → A− + NH2* |
| Electron affinity (to radical from cation) |
A+ + e− → A* | A+ + NH3 → A* + NH3*+ |
| Ionization potential | HA → HA*+ + e− | HA + NH3*+ → HA*+ + NH3 |
| Hydride affinity | A+ + H− → AH | A+ + NH3 → HA + NH2+ |
| Deprotonation | HA → A− + H+ | HA + NH2− → A− + NH3 |