List of hyperpolarized olefins and the corresponding values of boiling point, final olefin concentration, signal enhancement, and T1 relaxation time constants (T1) obtained from the D-DNP NMR experiments. The error ranges represent the standard deviations of the mean value from N repeated measurements (N = 7 for propene, 3 for 1-butene, and 3 for isobutene).
| Hyperpolarized olefin | Boiling point (°C) | Final olefin concentration (M) | C1 | C2 | ||
|---|---|---|---|---|---|---|
| Signal enhancement | T 1 (s) | Signal enhancement | T 1 (s) | |||
| Propene | −47.6 | 0.16 ± 0.04 | 4143 ± 589 | 17.3 ± 0.6 | 4655 ± 654 | 19.1 ± 0.6 |
| 1-Butene | −6.5 | 0.19 ± 0.02 | 4241 ± 765 | 18.0 ± 0.5 | 4976 ± 903 | 24.7 ± 0.6 |
| Isobutene | −6.9 | 0.17 ± 0.03 | 2247 ± 446 | 18.3 ± 0.2 | 3827 ± 565 | 42.3 ± 6.2 |