Table 1. Photophysical data of Br6A. Measured absorption and fluorescence maxima, fluorescence quantum yields (Φ_F) and lifetimes (τ_F), rate constants for radiative (k_F) and radiationless deactivation (k_nF), extracted via Φ_F = k_Fτ_F = k_F/(k_F + k_nF), where k_nF includes both, internal conversion (k_IC) and intersystem crossing (k_ISC1). Oscillator strength (f) extracted from the absorption spectrum, via the Strickler–Berg relation and from TD-DFT.

System	ε m/M–1 cm–1	λ abs/nm	λ em/nm	Φ F 17	τ F 17/ns	k nF/ns–1	k F/ns–1	f
								Abs a	SB b	QC c
MeOH	5812	352	457	0.128	2.4	0.363	0.053	0.09	0.111	S1: 0.16, S2: 0
CHCl3	5490	355	419	0.005	0.5	1.990	0.010	0.09	0.017	S1: 0.00, S2: 0.13 d

^aFrom f = 4.319 × 10^–9 [M^–1 cm²]∫ε_m(ν)dν.

^bFrom the simplified Strickler–Berg relation.12,13

^cFrom QC calculations (TD-DFT).

^dIn vacuum.