Table 3. Fluorescence Lifetimes, Quantum Yields, and Radiative Rates^a.

compd	τf (ns)	Φf	krad (μs–1)
c-P6[e6]	0.49	0.0013	2.6
c-P6[be5]	0.28	0.0026	9.4
c-P6[b5e]	0.44	0.010	23
c-P6[b6]	0.51	0.018	35
c-P6[be5]·T6*	0.22	0.0014	6.3
c-P6[b5e]·T6	0.32	0.0039	12
c-P6[b6]·T6	0.34	0.0038	11
THS-l-P6[b5]-THS	0.70	0.28	400

^aAll measurements were carried out in toluene (containing 1% by volume of pyridine for the template-free nanorings to suppress aggregation). Fluorescence lifetimes were measured using excitation at 810 nm and detection at 1050 nm. Fluorescence quantum yields were measured using THS-l-P6[b₅]-THS as a standard.¹⁷ Radiative rates are calculated as k_rad = Φ_f/τ_f.