Fig. 4: Relaxation time measurements.

a Spin echo decay curves for nitroxides cis,cis-9, 11, 12, and 13 at 50 and 100 K. b Temperature-dependent T_m values for nitroxides cis,cis-9, 11, 12, and 13 measured by spin echo decay. The method for the extraction of T_m values is described in the SI, Fig. S13.