Table 1.

Anodic peak potentials for 1‐6 ^† and rate constants (k _q) for the fluorescence quenching of ¹[3‐CN‐NMQ⁺]* by 1‐5. ^‡

Sulfoxide	$E_p^a$ (V) vs SCE	k q (× 1010  m −1 s−1)
1	2.04	1.35
2	1.89	1.69
3	1.85	1.32
4	1.77	0.52
5	1.84	0.73
6	1.80

^†In MeCN at 25 °C using an Ag/AgCl (KCl 3 m) as the reference electrode.

^‡In MeCN at 25 °C.