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1H and 19F ultra-low-field build up times for ethyl-5-fluoronicotinic acid, 3-fluoropyridine and 3,5-bis(trifluoromethyl)pyridine.
| Sample | Nucleus | T HP / s |
|---|---|---|
| Ethyl-5-fluoronicotinic acid | 19F | 2.4 ± 0.5 |
| 3-Fluoropyridine | 19F | 9.4 ± 3.9 |
| 3,5-Bis(trifluoromethyl)pyridine | 19F | — |
| Ethyl-5-fluoronicotinic acid | 1H | 3.4 ± 0.5 |
| 3-Fluoropyridine | 1H | 9.7 ± 2.4 |
| 3,5-Bis(trifluoromethyl)pyridine | 1H | 3.9 ± 1.0 |
