Table 1.
The 19F Relaxation Times and Loading Efficiencies of FILAMP
| ILs or Probes | Longitudinal Relaxation Time (T1) [s] |
Transverse Relaxation Time (T2) [s] |
Loading Efficiency (wt %) |
Fluorine Content (wt %) |
|---|---|---|---|---|
| Free BMMIBF4 | 4.908 | 4.446 | n/a | 31.7 |
| BMMIBF4-pH(thin) | 4.467 | 0.090 | 57.4 ± 5.2 | 18.2 ± 1.6 |
| BMMIBF4-pH(medium) | 4.194 | 0.084 | 36.2 ± 6.8 | 11.5 ± 2.2 |
| BMMIBF4-pH(thick) | 3.916 | 0.069 | 32.6 ± 5.5 | 10.3 ± 1.7 |
| BMMIBF4-MMP | 4.719 | 0.119 | 48.5 ± 4.4 | 15.4 ± 1.4 |
| Free EMIOTf | 3.665 | 3.650 | n/a | 21.9 |
| EMIOTf-pH | 3.144 | 0.217 | 53.1 ± 4.7 | 11.6 ± 1.0 |
| Free EPyBF4 | 4.364 | 3.817 | n/a | 39.0 |
| EPyBF4-pH | 3.277 | 0.055 | 46.6 ± 3.3 | 18.2 ± 1.3 |
Refer to Figure S6 for relaxation determination and curve fitting on an NMR spectrometer (564 MHz for 19F). Compared with free ILs, the 19F probes show similar T1 but much shorter T2, which is ascribed to the spin-spin relaxation of loaded ILs. With the construction strategy that exploits molten ILs, these probes feature high loading efficiencies and fluorine contents. Data are shown as mean ± SD (n = 3).