Fig. 8: Mechanistic studies.

a Radical clock experiment. b Cyclic voltammetric studies. c Luminescence quenching experiment. d Cl⁻ and pyridinium salt (I-2a) enhance the product formation. e Free-energy reaction profiles (kcal mol⁻¹) calculated with the SMD (acetonitrile) M062X/6-31 + G(d) level at 303 K.