Table 1 Cyclic voltammetry and additional photophysical parameters

	Oxidation			E_HOMO	E_LUMO	E_opt-gap	λ_abs (nm),^b	S₁	T₁	S_H/L^d
	E_1st	E_{onset ox}	E_2nd	eV	eV^a	eV	(ε × 10³ M⁻¹ cm⁻¹)	eV^c	eV^c
NON	+0.50	+0.37	–	–5.76	–1.90	3.86	264 (28), 294 (10.5), 304 (sh)	3.91	3.35	0.62
NON-CF₃	+0.90 (100)	+0.75	+1.38	–6.14	–2.24	3.9	273 (21.2), 302 (sh)	4.36	3.31	0.66
NON-Br	+0.62 (90)	+0.51	+1.12	–5.90	–2.21	3.69	270 (15.7), 304 (4.1)	4.36	3.21	0.62

^aIn 1,2-difluorobenzene (DFB) solution, recorded using a glassy carbon electrode, concentration 1.4 mM, supporting electrolyte [nBu₄N][PF₆] (0.13 M), measured at 0.1 V s^–1 while Ag wire was used as quasi-reference electrode. E_HOMO = –(E_{onset ox Fc/Fc+} + 5.39) eV; E_LUMO = E_{opt gap} + E_HOMO eV, see Table S2 and Fig. S11.
^bConcentration 3.57 × 10⁻⁵ M for NON, 3.16 × 10⁻⁵ M for NON-CF3; 2.69 × 10⁻⁵ M for NON-Br.
^CS₁ and T₁ energy levels based on the onset values of the emission spectra blue edge in MeTHF glasses at 77 K and 298 K.
^dS_H/L is an overlap integral between HOMO and LUMO calculated by DFT.

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