Table 2. Values of the efficiency of ring displacement, η_rd, and quantum yield of ring shuttling, Φ_sh, for 1⁶⁺ in the temperature range 284–303 K.

		Intramolecular mechanism (Scheme 2a)			Mechanism with assistance of phenothiazine (Scheme 2b)
T, K	k4, s-1	k5, s-1	ηrd	Φsh	k9[ptz+]0, s-1	ηrd	Φsh
284	8.1 × 102	1.4 × 105	<0.01	<0.001	2.5 × 103	0.25	0.04
288	1.8 × 103	1.4 × 105	0.01	0.002	3.2 × 103	0.36	0.06
293	3.5 × 103	1.4 × 105	0.025	0.004	3.3 × 103	0.51	0.08
299	1.3 × 104	1.3 × 105	0.09	0.015	5.1 × 103	0.72	0.12
303	2.1 × 104	1.3 × 105	0.14	0.02	6.7 × 103	0.76	0.12

Conditions were as follows: deaerated acetonitrile solution, and, for the assisted mechanism of Scheme 2b, [ptz] = 5.0 × 10^-5 mol·liter^-1.