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| Cation | α |
| Guanidinium | 5.0 |
| 2-Ethylhexyl ammonium | 4.8 |
| Triethyl ammonium | 4.8 |
| N-Methyl imidazolium | 4.7 |
| Li+ | 5.0 |
| Na+ | 4.1 |
| K+ | 3.6 |
| Rb+ | 3.5 |
| Cs+ | 3.5 |
| +I(4-tBuPh)2 | 4.9 |
| MOIM+ | 3.3 |
| N-Butyl-4-methyl pyridinium | 3.5 |
| Tetra(n-butyl)ammonium | 2.7 |
