Excited state reactions in the cycle shown in Scheme 5 (K_SV = Stern–Volmer quenching rate, k_q = bimolecular rate constant, η_q = quenching yield, η_ce = cage escape yield)^a.

	PS (τ0/ps)
	[Fe(iii)(btz)3]3+, 1 (100)
	K SV/M−1	k q/109 M−1 s−1	η q ([Q]/M)	η ce
C8F17I	0.43b	4.3	0.09 (0.12)	<0.15c
5-Hexen-1-ol	n.a.d	n.a.	0 (≤0.14)e	n.a.

^aIn MeCN.

^bFrom steady state emission quenching.

^cEstimated from absence of detectable ns-transient absorption.

^dNot applicable.

^eNo emission quenching up to indicated quencher concentration.