Fig. 4.
Laser flash photolysis (λexc = 355 nm, MeCN/Ar) experiments. a Transient absorption spectra recorded at 40 ns after the laser pulse of 3g (50 mM) without 1a (black), with 70 mM of 1a (red). b Transient absorption spectra recorded at 40 ns after the laser pulse of 3g (50 mM) with 70 mM of 1a (black) and with 35 mM of 2a (red). c Decay kinetics at 360 nm after 355-nm LFP of 3g (50 µM) in the presence of increasing amounts of 1a. d Decay kinetics at 485 nm after 355-nm LFP of 3g (50 µM) in the presence of increasing amounts of 1a. e Scheme of the formation of intermediate II from intermediate I and their reaction with 2a. f Lifetime of INT I: decays monitored at 360 nm of 3g (50 mM) and 1a (70 mM) (black line) and in the presence of 2a (37 mM) (red line). g Lifetime of INT II: decays monitored at 490 nm of 3g (50 mM) and 1a (70 mM) (black line) and in the presence of 2a (37 mM) (red line)