Table 2. Overview of Electron Spin Polarization Enhancements Achieved to Date via CIDEP.
| CIDEP mechanism | Molecules of interest | Polarization enhancement factora | Refs | Comments |
|---|---|---|---|---|
| RTPM | TEMPO-anthraquinone | 320 | (441) | In benzene |
| RTPM | TEMPO and rose bengal | 13.6 | (90) | ESP-enhanced DNP, in aqueous media |
| RTPM | TEMPO and 1-chloronaphthalene | 280 | (440) | At low temperature |
| RTPM | Nitroxide and eosin Y/rose bengal | 150 | (442) | In aqueous media |
| RQM | 2-pyrenemethyl TEMPO | 30 | (435) | In ether |
a
Defined as the ratio pe/pe,therm, where pe is the maximum polarization achieved in the TR-EPR experiment, and pe,therm is the polarization at thermal equilibrium.