| Parameters | Protonated Inhibitors | ||||
| H2L1+ | H2L2+ | H2L3+ | H2L4+ | H2L5+ | |
| EHOMO (eV) | −6.906 | −6.762 | −6.595 | −6.649 | −6.865 |
| ELUMO (eV) | −2.949 | −3.320 | −2.803 | −2.799 | −2.937 |
| ∆E (eV) | 3.957 | 3.442 | 3.792 | 3.850 | 3.928 |