Table 4.

Reactivity comparisons of 5(b) and [Fe^IV(O)(N4Py)]^2+.a

Complex	5(b)	[FeIV(O)(N4Py)]2+
t1/2 (s)
CH3OH	1200	4000
CD3OD	2000
CH3OD	2000
k2 (M−1s−1)
DHTb	0.58	0.09
P(Me)(Ph)2b	2.8	0.7
Fcb	0.049	0.012

^aHalf-lives and rate constants were determined at −60 °C in the presence of 500 equivalents Me₂Im in MeOH. Spectral changes at λ_max = 770 nm for 5(b) and 695 nm for [Fe^IV(O)(N4Py)]²⁺ were monitored. Half-lives and rate constants were averaged from at least 3 separate determinations, the standard deviation was < 10% of the reported values.

^bDHT = 1-methyl-1,4-cyclohexadiene, P(Me)(Ph)₂ = Methyldiphenylphosphine, Fc = ferrocene.