Table 1.

Summary of UV-vis λ_max and first-order rate constants. Solvent = THF. Errors are listed as one standard deviation over three trials.

Compound	λMLCT (nm)	νMLCT (cm−1)	kobs,1 (x 10−2 min−1)	kp (x 10−2 min−1)	kobs,2 (x 10−2 min−1)
1A	462	21645	n.d. a	0.9 ± 0.1	1.4 ± 0.4
1B	475	21053	2.5 ± 0.2	4.1 ± 0.4	7.6 ± 0.7
1C	483	20704	3.6 ± 0.6	3.3 ± 0.5	2.9 ± 0.3
1D	532	18797	17.0 ± 0.7	15.0 ± 0.8	10.1 ± 3.9
2B	471	21231	2.6 ± 0.1	4.4 ± 0.1	6.5 ± 0.4
3B	464	21552	0.55 ± 0.02	1.6 ± 0.1	2.3 ± 0.2
4B	447	22371	0.219 ± 0.002	0.14 ± 0.18	10.4 ± 5.2
5A	432	23148	0.13 ± 0.01	0.08 ± 0.03	0.40 ± 0.15
5B	443	22573	0.16 ± 0.03	n.d. b	2.3 ± 1.1
5C	453	22075	0.19 ± 0.05	0.16 ± 0.01	1.4 ± 0.4
5D	497	20121	1.39 ± 0.02	3.0 ± 0.5	5.1 ± 1.0
1B–Br	479	20877	6.9 ± 0.4	8.1 ± 0.8	9.2 ± 0.7

^aBecause the new species formed upon Ni(II)─C bond homolysis has absorption underneath that of the starting material, we were unable to obtain k_1,obs for this compound. The rate is approximated by k_2,obs.

^bComplex 5B was omitted owing to poor convergence of the global kinetics model.