Table 2.

Redox potentials of Br^2DNiR and AxNiR^*

	T1Cu (mV)	T2Cu (mV)
Br2DNiR	284 ± 11	231 ± 18
AxNiR‡	255 ± 3	244 ± 18
AxNiR F306C variant‡	262 ± 3	269 ± 11

^*See SI Appendix, Fig. 2 for EPR and optical data used to obtain redox potentials of T2Cu and T1Cu sites, respectively.

^†Redox values taken from ref. 9.